HP 211A Service manual

Model

211A

Table of Contents

List of Illustrations and Tables

TABLE OF CONTENTS

Section Page Section I GENERAL INFORMATION

1.1

.

General Description

1.9

.

Damage in Transit

1.11

.

Power Transformer Conversion

OPERATING INSTRUCTIONS

2.1

.

Controls and Terminals

2 -1 1

.

Instrument Loading

.

2 -1 7

Ringing

2.19

.

External Sync Operation

2.22

.

Pulses

2 .24

.

Balanced Output

THEORY OF OPERATION

.

3 .1

Introduction

3.3

.

Sync Trigger

3.7

.

Multivibrator

3.12

.

Clipper Amplifier

3-1 5

.

Power Amplifier

Number

2 .1

.

Common Impedance Matching Networks

2.2

.

Front Panel Showing Operating Controls

2.3

.

Basic Output Circuit of

2.4

.

Method of Obtaining a Balanced

Output from the

3.1

.

Block Diagram Showing Operating

Controls of

4.1

.

Model

Amplifier and Power Supply

................

.............

21

211A

21

1A

Bottom View Showing

.........

..........

.

.......

.........

.......

...........

.........

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LlST OF ILLUSTRATIONS

.

211A

1A

......

.........

............

......

1-1 1-1 4.1 1-2 4.3 1-2 4.5

2-1 2-1

2 -1 2 -1

2-1 2-3

2-3

3-1 3 -1 3-1 3-1

3-1 3-2

Page Number

2-1 4.2 2 -2 3 -1 4.4

3 -3

3 -0 4.8

4-2 4.11

IV MAINTENANCE

.

4.3

.

4.5

.

4.6

.

4.7

.

4.9

. ...........

4.10

.

Introduction

.

Cabinet Removal

.

Equipment Required

.

4.7

Trouble Localization

.

4.12

Tube Replacement

.

4.15

Adjusting the Power Supply

.

4.20

Frequency Calibration

4.24

.

Adjusting External Sync Sensitivity

4.27

4.41

REPLACEABLE PARTS

5 .1

5.2

Model Test Setup for Frequency Calibration

Test Setup for Sync Sensitivity

75-Ohm

Defects on Positive Portion Model Voltage and Resistance Diagram Multivibrator and Power Supply Output Section Range Switch Detail Attenuator Switch Detail

Sync Sensitivity

.

Waveform Observation and

Measurement

.

Servicing Etched Circuit

Boards

.

Introduction

.

Ordering Information

211A

Output Waveform which has

211A

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........

.........

.....

.......

.........

..........

..............

.........

.............

........

Top View

Waveforms

..........

......

.........

.....

..............

.........

..............

page

4-1 4-1 4-1 4-1

4-1

.

Page

4-5 4-6

.

4-6

LlST OF TABLES

Number Page

.

1.1

Specifications

.

4.1

Tube Replacement Chart

4.2

.

Test Equipment Required

4.3

.

Troubleshooting Chart

.

4.4

Calibration Chart

.

5.1

Reference Designation Index

5 .2

.

Replaceable Parts

................

..........

...........

..............

........

.............

1-1 4-0 4-1 4-3 4-4 5-2 5

-7

Section Figure

I

1-1

Model

211A

Figure

1-1.

Model

2llA

Square

Wave Generator

Model 211A

Paragraphs

Section I

1-1

to 1-5

SECTION

GENERAL INFORMATION

1-1.

GENERAL DESCRIPTION.

1-2. The @ Model 211A Square Wave Generator

precision wide range instrument particularly suited

for use with a fast oscilloscope for video amplifier testing, permitting a rapid examination of amplifier frequency characteristics computer, pulse code, telemetering, and similar applications it offers great convenience as a variable trigger source for switching purposes. In television work it

as

can serve cations it finds use in testinga variety of devices such uators, filters, delay lines and audio systems.

1-3. The Model

puts, one 75-ohm output and one 600-ohm output. The

rise time of the 20 millimicroseconds, which

Frequency Range

Low

a bar generator. In highfrequency appli-

is

valuable as a modulator source. It also

2llAhas been designed with two out-

signal

1

cps to 1 mc, continuous coverage.

Impedance Output:

-3.5 volt peak across 75-ohm load -7 volt open circuit, zero level clamped to chassis; rise time less than 0.02

up

to many megacycles. In

from the 75-ohm output

is

sufficiently fast to test

:

pec.

as

is

Table

is

atten-

only

1-1.

the response of video devices out to approximately 20

a

megacycles or toprovide age the signal across the 75-ohm internal impedance volts, or 3.5 volts peak-to-peakinto a 75-ohm external load. This output level may be adjusted with a 60-db step attenuator trol, a particularly desirable arrangement when low output levels are required.

1-4. The second output from the generator provides 55volts peak-to-peak from a source impedance of 600 ohms. The rise time of this signal microsecond with the output level controlled separately from that of the 75 -ohm output. Both outputs are used

simultaneously.

1-5. The frequency range of the instrument,

1

mc,

S~ecifications

Dimensions:

Cabinet Mount: 9-3/4 in. wide, 15-1/4 in. high, Rack Mount:

I

a

high speed triggeringvolt-

of

variable rate. The peak-to-peak amplitude of

in

combination with an amplitude con-

is

less than 0.1

is

covered in six 10/l bands. The frequency

14-5/8 in. deep.

m

11

nmm!BDL

t

1

cps to

is

7

High Impedance Output:

-27 volt peak across 600-ohm load -55 volt open circuit, zero level clamped to chassis; rise time less than 0.1

Relative Phase

180° phase difference between high and lowim-

pedance output

Amplitude Control

Low

Impedance Output - Potentiometer and 60 db attenuator, variable in 20 db steps. High Impedance Output

Frequency Control:

Dial calibrated

switch. Six bands.

Symmetry Control:

Allows exact square-wave balance.

Sync Input

Positive-going pulse or sine wave signal, min. amplitude 5 volts peak.

Power:

ii5/230 volts +looh, 50-60 cps, 225 watts.

psec.

:

signals.

:

-

Potentiometer.

"1

to 10" and decade multiplier

:

Cabinet Mount: Net 26 Rack Mount: Net 25 lbs, shipping

Accessories Available: (Cable Assemblies)

@

AC-16A.

coaxial cable terminatedwith dual banana plugs.

@

AC-16B. Four feet of RG-58C/U calbe terminated by UG-88/U type BNC male connector on the other.

$9

AC-16D. Four feet of RG-58C/U cable terminated on one end by

@

AC-16K. Four feet of RG-58C/U cable terminated by BNC male connectors on each end.

Four feet of RG-58C/U 50-ohm

a

dual banana plug on one end and

lbs,

shipping 38 lbs.

34

lbs.

a

BNC male connector.

a

Section

I

Paragraphs 1-6 to 1-12

dial

is

linearly calibrated from 1 to 10. The six positions on the range switch multiply these calibrations in decade steps.

For purposes of synchronization a

1-6.

is

ger circuit

located ahead of the multivibrator and

set to trigger on a minimum input sync

Schmitt trig-

signal

of 3 volts

is

peak, but a 5-volt peak sine wave or a positive pulse

is

signal

recommended for practical use. The sync trigger provides a fast trigger of uniform rise and amplitude which aids in

obtainingaccurate time switching of the frequency multivibrator, and at the same time isolates the. multivibrator from the input wave-

If

form.

no sync signal is used the multivibrator free-runs at a frequency controlled by the range switch and the frequency control.

Model 211A

frequency or range. This local feedback together with a regulated power supply assures an output essentially free from amplitude variations over the entire frequency range from

1

cps to 1 mc once the

output

controls have been set.

1-9.

DAMAGE

IN

TRANSIT.

1-10. After unpacking the instrument, should any shipping damage be discovered, follow the procedure described in the "Claim for Damage" sheet in this manual.

1-11.

POWER TRANSFORMER CONVERSION.

1-12. Should it be desired to operate the Model 211A from a 210-250 volt source proceed as follows:

The multivibrator employs two type

1-7.

6CL6 power

pentodes with precision components in the rc timing

networks. Residual variation in tubes

or time con-

stants may be compensated by a symmetry control

which balances the relative plate voltage swing on the

multivibrator tubes.

1-8. Two outputs are taken from the frequency multivibrator to drive a push-pull clipper amplifier consisting of two for four

parallel as the output power stage.

is

used in the power stage to stabilize the system

6CL6's. The clipper serves as the driver

6CL6 power tubes arranged in push-pull

Local feedback

against variations in output level with a change in

a. Remove the two bare wire jumpers from the

terminal strip located beneath the power transformer.

These jumpers connect the Black to the Black-Green lead and the Black-Red to the Black-Yellow lead of

the power transformer primary.

b. Insert a new jumper on the terminal strip which

will connect the Black-Yellow to the Black-Green lead.

c. Change line fuse

F1 to one with a 1.25 ampere slow-blow rating. As shown in the schematic diagram, this alteration changes the primary windings of the power transformer from a parallel to a series

arrangement.

Model 211A

Section

Paragraphs 2-1 to 2-21

I1

SECTION

OPERATING INSTRUCTIONS

2-1. CONTROLS AND TERMINALS.

2-2. ON. Applies line voltage to the instrument. 2-3. RANGE. Switches time constants in the

vibrator circuit to establish various frequency ranges.

FREQUENCY.

to

produce

RANGE switch position.

2-5. OUTPUT AMPLITUDE. The 600 51 control varies the amplitude of the signal at the 600 51 output terminals. The 75 51 controlvaries the signal voltage applied to the 75 51 output attenuator.

51

2-6. 75 jack in 20 db steps below the level set with the OUTPUT AMPLITUDE control.

2-7. SYMMETRY. A balance potentiometer in the multivibrator plate circuit which effectively balances the amplitudes of the signals tothe multivibrator grids and equalizes each square wave half cycle.

2-8. 600 51 OUTPUT. Two three-fourth inch spaced binding posts which serve a sync out connection when 7551 output

ATTEN. This control reduces the output

':lo

Varies

the

frequency change

as

the 600 51 output, or

is

On

in use.

multi-

grid

each

75

as

51

II

2-15. When it second rise time, 75-ohm output cable should be used

(RG-59/U). When it

systems other than 75 ohms, it both ends of the output cable to impedance.

2-16. Physical arrangements for use in matchingthe instrument output to common impedances are shown

in figure 2-1.

OUTPUT

75n

is

desired to realize the 20 millimicro-

is

desired to drive low impedance

is

necessary to match

its

characteristic

75fi (RG-59lU)

*

-

75

n

OUTPUT

t

93 A (RG-62lU)

b

-

2-9. 75 serves connector when the 60051 output

2-10. SYNC SYNC trigger which accepts sine waves or positive

pulse synchronizing

of 5 volts peak.

a

slightly lower frequency

nized frequency. Figure 2-1. Common Impedance

2-11. INSTRUMENT LOADING.

2-12. For low frequency applications involving high impedance devices under test the output from the-211~ may 600-ohm terminal with little effect on the square wave characteristic and the calibration of the 75-ohm attenuator.

2-13. greater attention to impedance matching and line losses in order to preserve attenuator calibration and to prevent deterioration of square wave shape.

2-14. rent pulse with internal impedances. The use of the 75-ohm terminal

permits

the 75-ohm internal impedance, and the 75-ohm ator allows these square waves to tude without destroying their characteristics.

51

OUTPUT. A female type BNC connector

as

the 75 51 output connector, or as a sync out

is

in use.

IN.

A female typeBNC connector to the

signals

FREQUENCY control must be set at

be

taken from either the 75-ohm terminal or the

Low

impedance devices, however, require

The Model 211A produces

a

peak value of

a

fast rise square wave to

with a minimum amplitude

than

the desired synchro-

a

square-wave cur-

100 ma across

be

developed across

attenu-

be

reduced in ampli-

its

75

n

OUTPUT

77:.

-

Matching

2-17. 2-18. Most video amplifiers or rlc circuits resonant

below 30 mc are subject to ringingwhen rise pulse or square wave. these cases to reduce this effect by proper matching before assuming faulty operation of the Model

2-19. EXTERNAL SYNC OPERATION.

2-20. With the instrument externally synchronized, the Schmitt trigger will control the switching of the multivibrator only when the period of the multivibrator

is

2-21. To permit the Schmitt-trigger output to fire the multivibrator, set the FREQUENCY control to a value slightly less use. This setting permits the trigger pulse to fire in

RINGING.

slightly greater than that of the external sync signal.

than

a

free-running recovery.

~etworks

hitwith a fast

Care should be taken in

the frequency desired for sync

(RG-581.

SD-M-8

211A.

2-1

Section

Figure 2-2

II

Model 211A

OUTPUT AMPLIT

LD- L-

I9

1.

RANGE. Select range of output frequency 6. 7552ATTEN. Attenuate voltage at 7552out-

desired.

2. FREQUENCY. Select output frequency.

3. OUTPUT AMPLITUDE 60052. Adjust output signal voltage

4.

OUTPUT SIGNAL. Source impedance 600% tube.

5. OUTPUT AMPLITUDE. Adjust output volt-

age at 7552 output jack.

at

60052 output terminals.

put jack in 20 db steps.

7. OUTPUT SIGNAL. Source impedance 7552.

8.

SYMMETRY. Adjust square-wave output

voltage symmetry by viewing on cathode ray

9.

SYNC IN. Apply external nize square-wave output signal.

signal

to synchro-

-

Figure

2-2.

Front Panel Showing Operating Controls

00093

-

3

Model 211A

Section

I1

Paragraphs 2-22 to 2-29

2-22.

PULSES.

2-23. The clipper amplifier and output tubes in the Model 211A operate in a circuit designed for a duty cycle. The balance of this circuit

is

maintained

50%

by the SYMMETRY control which balances the two

as

padding

range of

this

outputs from the multivibrator. Any alteration of circuit attempting to generate pulses, such the SYMMETRY potentiometer to extend

its

control, would overdrive one side of the clipper amplifier and output tubes beyond the 50% duty cycle factor to the eventual damage of the instrument.

2-24.

BALANCED OUTPUT.

2 -25. The 21 1A can be converted to a balanced source

without modifying the instrument in any way. Figure

2-3 shows the basic arrangement of the output circuit. The output tubesthemselves are in push-pull but have unequal loads as

shown A balanced voltage can thus be obtained by equalizing the tube loads. This can be done directly

75n

LEVEL CONTROL

T

OUTPUT

at

the terminals on the panel.

OUTPUT

ATTENuATOR

nn

OUTPUT

figure 2-4. This additional resistance will reduce the source impedance at the lower terminals to about 75 ohms and will also reduce the voltage available from the lower terminals to approximately the same amount available at the upperterminal. At the same time the additional resistance will form a more favorable time constant with the stray capacity

Co at the lower terminals and thus speed up the normally slower rise time at those terminals until

comparable to

that

of the

it

is

75-ohm output. 2-27. Figure 2-4 suggests the use either of two

75-

ohm cables or abalanced 150-ohm cable for connecting

to the load.

In.

either of these cases

it

is

normally unnecessary to terminate the cables, so that they can be connected directly to the load. The arrangement

has

the advantage that

If

impedance.

cables of other impedances are used, they should be terminated ance of the cable. This will involve

it

can be used with any load

inthe characteristic imped-

a

consideration

of the load impedance in some cases.

75n

OUTPUT

BALANCED

TWO

75n

150n

CABLE

0

R

COAXIAL

1

cneLes

-

-------

OUTPUT

Figure 2-3. Basic Output Circuit of 211A.

2-26.

In

figure 2-4 the upper terminal represents the 75-ohm output and the lower terminals represent the 600-ohm output. To equalize the source impedance at the two outputs, a resistance of 86 ohms can connected across the lower terminals

as

be

shown in

SEE

TEXT-

'

Figure 2-4. Method

Output from the 2

of

Obtaining a Balanced

11A

2-28. The output voltage can be selected most conveniently if the 75

ATTEN. output

is

first set to

S2

zero. The two OUTPUT AMPLITUDE controls will

then have about the same voltage range and each should

as

be set

necessary to obtain one-half of the desired

output voltage. This will occur when both controls are

If

at about the same angular position.

desired, both

line-to-ground voltages can be measured with a volt-

meter or an oscilloscope. 2 -29. Output voltage will be as high as 14 volts

peak-

to-peak, open circuit, and 7 volts peak-to-peak ter-

minated with 75 ohms.

Section

Figure

III

3-1

Model

211A

SYNC

IN

SCHMITT

TRIGGER

(SINE

OR

POS.

-

PULSE)

OSYMMETRY

\

I

,

AMPLITUDE

-

PLATE

COUPLED

Iw

-v

I----

\

CLIPPER

AMPLIFIER

\

-

POWER

AMPLIFIER

0

\

-

ATTENUATOR

\

-

o.20.40,

+600fL

+75n

-

P

\

-

\

-

\

I

-

Figure

3-1.

Block Diagram Showing Operating Controls of

211A

Model 211A

Section

Paragraphs 3-1 to 3- 18

III

SECTION

CIRCUIT DESCRIPTION

3-1.

INT~?ODUCTION.

3-2. Maior circuit elements are shown in the circuit

diagram figure 3-1. Special aspects

block

circuit elements are discussed in subsequent paragraphs to supplement the general discussion in para-

1-1.

graph

3-3.

SYNC TRIGGER.

3-4.

The

sync trigger switcheswith the application on the input grid. The circuit configuration

tional for a Schmitt trigger except the placed in the trigger-output circuit to produce spikes.

Since the Schmitt trigger changes state once on the

positive-going portion the negative-going ~"rtio% two spikes are developed across the and the other negative.

3-5.

grid of one multivibrator tube (V3) cutting off conduction. Conduction then starts in V2. For the sync

trigger to effect a synchronized condition inthe multivibrator, the negative cut-off pulse from the trigger

must

cut-off in a free-running condition. This

lished

(with the FREQUENCY dial) to a value slightlv less

than

3-6. the Schmitt-trigger circuit adjusting the cathode level.

so that the triggering level of the trigger input grid.

3-7.

3-8. The multivibrator (V2 and V3) free-running, plate-coupled multivibrator. The frequency of operation return voltage with R37 (FREQUENCY control) over

3-9. The RANGE switch S2 inserts various rc time constants into the grid return circuit, and these time constants establish the rate of decay for the cut-off side of the multivibrator toward the voltage established

by the FREQUENCY control 3-10. The diode clamp controls the current of the con-

ducting side of the circuit and thus controls the voltage drop across the plate load resistor of the conducting

half.

clamp control cathode follower V5. Since this adjustment determines the startingvoltage level for decay in the section cutting off, the frequency of operation, and the instrument initially at 1000 The function of the clamps

L1, L2 differentiating circuit, one positive

The

reach

that

Output grid bias (effectively,sync sensitivity) in

This voltage

the grid

the

operator setting

of the incoming sync signals.

MULTIVIBRATOR.

is

a

Schmitt

of

a

of

an

is

of

V3

the

is

adjusted with R10, thus

R10

is

3 volts above the level

is

varied by adjusting the grid

R37.

established by adjusting

it

also exercises control over

it

cps on the XlOO range.

is

to stabilize the frequency

trigger

positive going signal

L1 and L2 are

signal and once on

through

the

tube

free-running

normally adjusted

is

a conventional,

is

used to calibrate

is

conven-

CR1

reaches

is

accomp-

R31

these

which

to

the 3-14. At high frequencies, the effective

rate

on the

Ill

of operation against changes in the circuit such as tube aging, line voltage, and filiament fluctuations.

3-11. The output

push-pull drive for the clipper amplifier V6 and V7.

3-12.

3-13. Clipper amplifier tubes V6 and V7 alternately conduct drivers for the output tubes.

clipper

fier stage through a broadband inter stage network con-

sisting

the R57, R58, sensitive

of

ages

normal plate load resistors

are reduced to preserve fast rise time of the square

waves.

C21 through C23 to ~22 through

this path the high

and R58, since these are small compared to the nor-

mal

3-15.

3-16. The power amplifier consists of four type 6CL6

tubes arranged in push-pull parallel with a constant

resistance network in the cathode circuit, R65, R66,

R67, and L8. This network compensates for the effects of heater-cathode capacitance on the leading and trailingedges of square wave output duringtube switching. The output tubes, like the clipper amplifier stage, alternately conduct and cut-off. The compensating network introduces a reactive transient into the cir-

cuit with a sign opposite to that produced by the tube elements during switching.

3-17. Each side of the power amplifier furnishes a

separate output to the output stage of the instrument. The low impedance output passes through a 75-ohm potentiometer (OUTPUT AMPLITUDE control) to 75-ohm three-section pi-filter. The 600-ohm output passes through a 600-ohm potentiometer (OUTPUT AMPLITUDE control) to the output terminals. The 600a OUTPUT AMPLITUDE control ometer and consists of two 1200-ohm sections lel to accommodate heat dissipation requirements.

3-18. Since the power supply

to the chassis and the output

square wave

ground terminal. Thus the negative portion of the

source wave

portion

CLIPPER AMPLIFIER.

and cut-off in opposition, and serve as the

amplifier

of

C19,

associated

C21

to

the output tubes. ~h~ ,-.lipper amplifier

for

low

The

plate loads whichtheyparallel at highfrequencies.

POWER AMPLIFIER.

is

at ground potential.

from

the rnultivibrator furnishes

The outputs from the

are

dc-coupled to the power ampli-

and

R52,

C20

and

R53,

togetherwith

plate

load

and

C22.

maintain

resistors

This

a

including ~55, R56,

network

voltage on the grids

is

frequency

output

frequencies

high

frequency

B+

C-3

to

B+

frequency

is

actually negative with respect tothe

is

below ground potential and the positive

are

developed

(R56, R50, R51, ~54).

path

is

at

chassis ground, and by C20,

at

chassis ground.

plate loads become R55

is

negativewith respect

is

direct coupled, the

across

plate

defined

is

a dual potenti-

by

~h~~~~h

inparal-

volt-

the

loads

C19,

a

Section IV Table 4-1

-

TUBE

TYPE

Table 4-1. Tube Replacement Chart

FUNCTION

ADJUSTMENT REQUIRED

Model 211A

V1

V2 V3 V4 V5

V6 V7 V8 V9 V10 V11

V12 V13 V14 Vl5

6BQ7 6CL6

6CL6 6AL5 6 C4

6CL6* 6CL6* 6CL6* 6CL6* 6CL6* 6CL6*

5V3

6AS7GA

6BH6 Control Tube

1

5651

*Type 6197 tubes may

Schmitt trigger 1/2 Multivibrator

Multivibrator

1/2 Diode Clamp Clamp Control Cathode Follower

7552 Output Clipper Amplifier 60052 Output Clipper Amplifier 7552 Output Tube 7552 Output Tube 60052 Output Tube 60052 Output Tube

Full-Wave Rectifier Series Regulator

1

Reference Tube

be

used in place of type 6CL6 if desired

Adjust SYNC SENSITIVITY, paragraph 4-24 Recalibrate FREQUENCY dial, para. 4-20

dial, dial, dial,

para. 4-20 para. 4-20 para. 4-20

Recalibrate FREQUENCY Recalibrate FREQUENCY Recalibrate FREQUENCY

No adjustment No adjustment No adjustment No adjustment No adjustment No adjustment

Check power supply output (paragraph 4-15) Check power supply output (paragraph 4-15) Check power supply output (paragraph 4-15) Check power supply output (paragraph 4-15)

Model 211A

Section IV

Paragraphs 4-1 to 4-18

SECTION

MAINTENANCE

4-1. INTRODUCTION.

4-2. This section contains instructions f or maintaining, troubleshooting, replacing tubes, and internal

adjustment of the Model 211A Square Wave Generator. A systematic troubleshooting chart will assist in localizing most troubles which may occur, and it keyed to applicable paragraphs in the test tofacilitate testing the instrument. Another chart includes instruc-

f

or tube replacement and subsequent adjustments.

tions

is

A table of important waveforms

a

discussion of techniques and equipment necessary to

observe these fast rise waveforms.

4-3.

CABINET REMOVAL.

4-4. To remove the instrument from the case, remove the two machine screws slide the instrument forward.

4-5. EQUIPMENT REQUIRED.

4-6. The test procedures in this section attempt to isolate

a

of the instrument, however, require that the following test equipment be available.

as

many probable difficulties

minimum of equipment. The nature and capabilities

Table 4-2. Test Equipment

onthe rear

given together with

of

the cabinet, and

as

possiblewith

Required

is

IV

failure possibilities.

chart should be performed chart assumes that the section aheadof the one under

is

investigation 4-10. normally operating instrument.

of importantwaveforms observed on ment ment and techniques needed to successfully observe these fast rise waveforms (paragraph 4-27).

4-11. For variable transformer toadjust the line voltage between 105 and 125 volts

satisfactory condition should operate over this range. An instrument having marginal operation (from weak tubes) can be quickly detected weaknesses become easier to trace.

4-12. TUBE REPLACEMENT.

4-13. Tubes used in the Model 211A Square Wave

Generator are listed in table 4-1. A tube may be replaced with any

characteristics. Those tubes which require adjust-

ment when replaced are accompanied by the applicable paragraphinthis section of the manual.

A voltage and resistance diagram

cluded (figure 4-7) which gives values measured on a

is

given, together with a discussion of the equip

operating correctly.

all

testing of the Model 211A the use of

The maintenance steps in the

inthe order given since the

has

In addition, a chart

a

typical instru-

is

recommended. An instrument in

at

low line voltages, and

tube

of

its

type having standard EIA

a

reference to

been in-

-

a

Adjustment

Frequency Calibration

Output Wave

Characteristics

4-7.

TROUBLE LOCALIZATION.

4-8. The Model 211A Square Wave Generator

precision instrument designed conservatively for long

component life. Tube replacement and adjustments

will repair

Isolation considering the basic sections of the instrument as shown in the block diagram, figure 3-1.

4-9. The troubleshooting chart (see table 4-3) describes checks to be performed which locate specific symptoms, together with possible causes and remedies. In the chart (table 4-3) only the tubes are referenced,

ponents associatedwith the referenced tubes are also

a

of

a circuit failure

@Model 405 series or Electronic frequency counter

(@

Model 523 or 524 series) or an oscillator and oscilloscope for Lissajous patterns.

High frequency oscilloscope with dc input feature and amplifier rise time of at least

0.012

psec, to check squarewave

leading edge output.

(@

Model 170A/162F)

majority of difficulties which develop.

is

frequently possible by

but it should be remembered that com-

412A.

a

vertical

is

a

4-14. The type

ruggedized equivalents, type 6197, to take advantage of the benefits of the

6CL6 apply equally to the 6197.

4-15. ADJUSTING THE POWER SUPPLY.

4-16. The power supply in the 211A must function correctly before the instrument will operate properly. Noise or variations in the regulated voltages may cause

the instrument to drift out of calibration and other

circuits to operate erratically. 4-17. To measure power supply voltage, connect a

dc voltmeter with end terminal of

sis.

The voltage should be between -192 and -200 volts.

This voltage must be set to the point where regulation

is

obtained under high (115 volts volts -10%) line conditions. A value of -195 volts average for most instruments.

4-18.

lost under high-line conditions and excessive jitter will occur in the leading edge of the output wave. and leading edge jitter will be noted under low-line

conditions. Excessive jitter in the leading edge of the

output square wave will indicate loss of regulation

more quickly than a dc voltmeter connected directly across the output of the power supply. This check

If

the voltage

6CL6 tubes may be replacedwith their

.this premium type. All references to

i1%

calibrated accuracy between the

R10 (shown in figure 4-2) and the chas-

the voltage

+lo%)

is

set too low, regulation will be

is

set too high, loss of regulation

and low (115

is

square

Section

Figure

4-1

IV

Model

211A

Figure

4-1.

Model

211A Bottom

View Showing Amplifier

and

Power Supply

00093-8

Model 211A

Section IV

Table 4-3

Table 4-3. Troubleshooting Chart

AND

CHECKS

1.

POWER SUPPLY

With line voltage set at

of regulated supply

SYMPTOMS

115V, check that output

is

at correct value (see

figure 4-2) Slowly vary supply voltage from 105 to 125 volts.

of

The negative output

the supply should not vary.

Excessive variation:

Low voltage:

High voltage:

Erratic voltage:

52

2. OUTPUT WAVEFORMS 75 Observe and measure output waveform at

OUTPUT

75 output terminals with a high-speed (30 mc response) oscilloscope. See paragraph 4-27. Adjust SYMMETRY control to mechanical

center.

Waveform grossly out of symmetry.

Cannot correct with control:

Leading edge rounding:

(75

52

Low peak voltage (600

52

output normal)

Weak output (both 75S2 and 60052 outputs)

out)

:

POSSIBLE CAUSE

Replace V13, V14, V12 or V15 in this order. V13, V14 and V12 are most likely to cause trouble.

Defective rectifier V12 or regulator V13.

Defective controltube

Vl4.

Defective reference tube V15.

Defective V2 or V3.

Defective V6,

V8,

or V9.

Defective V6, V8, or V9.

Power Supply.

Defective V6 and/or

V7.

REMEDY

if

Readjust R92, with

115V ac line. See

necessary,

paragraph 4 -15.

Replace tubes; check supply; see paragraph 4-15.

Replace; check supply; see

paragraph 4-15.

Replace; check supply; see

paragraph 4-15.

Replace; recalibrate

XlOO range. See DIAL CALIBRATION, this chart.

Replace. No adjustment. Replace, No adjustment. Check paragraph 4-15 and

this

POWER SUPPLY,

chart.

Replace. No adjustment.

With dc input feature on scope, check 1 cps

output

(be

sure dc amplifier in scope

is

balanced)

Sloping top on waveform:

Check leading edge

of

output at 1 mc

Rise time slow:

3. OUTPUT WAVEFORMS

60052 TERMINALS.

Observe and measure output waveforms at 600 terminals with a high frequency oscilloscope with a rise time response)

=

O.Ol2psec or less (30 mc

if

possible. See paragraph 4-27.

Leading edge rounding:

52

Low peak voltage (75

Check 600

52

output at 1 cps and 1 mc as des-

cribed above (step

normal)

2).

:

Defective V2 or V3.

Defective V6 Defective V6

thru V11.

thru

V11.

Defective V7, V10 or V11.

Defective V10 or V11

Replace; recalibrate

XlOO

range. See DIAL CALIBRATION, this chart.

Replace as necessary. No adjustment. Replace as necessary. No adjustment.

Replace as necessary. No adjustment.

Section IV Paragraphs 4-19 to 4-23

CHECKS AND SYMPTOMS

4. DIAL CALIBRATION Check calibration at

setup shown in figure 4-3.

Calibration tracking off more at one end

than at other:

Slight deviation:

Unable to adjust with

Check

Table 4-3. Troubleshooting Chart

1000 cps on XlOO rangewith

R31:

(cont'd)

POSSIBLE CAUSE

Power supply not properly

set.

Out of adjustment.

Defective V2 and V3.

Defective V4,

Model 211A

REMEDY

Check power supply.

Adjust paragraph 4-20.

Replace; recalibrate range. See paragraph 4-20.

R31 for 1000

s

.

XlOO

See

5. INPUT

Drive sync in with 5-volt peak 1000 % signal. Set 211A dial to 980 cps. Test setup shown in figure 4-4.

Check range

is

valid only when

are known to be good. Failure of the power supply

to regulate

tubes. See table 4-3, Troubleshooting Chart. 4-19.

at a location where a 211A

supply can be adjusted to partially compensate for any

adverse effects in instrument performance. The nega-

tive dc output of the power supply

-200 volts in the text and the schematic diagrams in

this manual. The actual voltage in an instrument will

vary

4-20. FREQUENCY CALIBRATION.

4-21. The output from the cps on the XlOO range with the FREQUENCY dial set

to 10. The operating frequency of the 211A on

range current (bias) which

R31 in the clamp circuit. All other ranges are calibrated by adjusting the rc time constants network after the XlOO range

4-22. The test setup for frequency calibration

shown in figure 4-3. The procedure

If

from this figure

is

TFUGGER

No sync:

of

sync to 950 cps.

Sync will not hold range:

1

Sync normal at

all

prcperly

prevailing high or low line conditions occur

kc lack

other tubes in the instrument

is

generally

is

as

just described.

211Ais adjusted tothe 1000

determined by the multivibrator operating

can

be adjusted by potentiometer

of

sync at 1 mc:

an

indication of weak

being used, the power

is

referred to as

theXlOO

inthe timing

is

correctly set.

is

as follows:

Defective

Defective CR1 or V1.

L2 open

V1

a. Set FREQUENCY

RANGE switch to

b. Connect instrument output to either a counter

or to the horizontal sweep of an oscilloscope with a

stable oscillator

c. Adjust cps from the Model 211A on the counter, or a zero beat Lissajous pattern on the scope.

d. Repeat steps a and b above using 100 cps, with FREQUENCY on the counter or a zero beat Lissajouspattern on scope.

4-23. Calibration of all ranges should be done in the order shown in the Calibration Chart (table frequency counter measurement for steps 5 and measurement. When using period measurement, measure a total square wave period, rather than a half-period, to eliminate SYMMETRY control effects.

A 0.01 tween the Model 211A output and the counter input when making period measurement.

drivingthe vertical sweep at 1000 cps.

R31, shown in figure 4-2, to obtain 1000

dial

pf capacitor should be connected be-

Replace; adjust sync

tivity. See paragraph 4-24. Replace; adjust sync

tivity. See paragraph 4-24.

dial

on 211A to 10 and the

X100.

set to

1.

Adjust R98 to obtain 100 cps

is

used for calibration, use period

6,

rather than frequency

Note

sensi-

4-41.

If

a

Perform Steps in Order

1.

2.

3.

4.

5.

6.

Set Range to:

XlOO X1K

XlOK

XlOOK XI0

X1

Table 4-4. Calibration Chart

Set Dial to:

10 10

5 5

1

Adjust Pot.

Measure Frequency

Paragraphs 4-20, steps a through d

R2

R20 R19 R23 R24

1

10,000 cps 50,000 cps

500 kc

10 cps (100 ms)

1

cps (1000 ms)

Model

211A

Section

Figure 4-2

IV

Figure 4-2. Model 211A

Top

View

Section

Figures 4-3 and 4-4

IV

Model

211A

f

@

000

00-

\

-hp-

MoDEL ellA

SQUARE WAVE

@

GENERATOR

\<

USE

0.01

WHEN MAKING PERIOD

MEASUREMENT

UF CAPACITOR

-hp-

SERIES FREQUENCY COUNTER

MODEL

523

OR 524

\

-~

/

0 0

0

LD-L-24BC

\

i

63

000

f

\

-hp- -hp-

MODEL200CD WIDE RANGE OSCILLATOR

Figure 4-3. Test Setup for Frequency Calibration

GND TO CHASSIS

OSCl LLOSCOPE

LOW CAPACITY

HIGH FREQUENCY

PROBE

f

0

>

MODEL 4000/H/L

VOLTMETER

@

\

VERT.

0

HORIZ.

0

LD-L-24BC

\

1

I

Figure 4-4. Test Setup for Sync Sensitivity Adjustment

Model 211A Section IV

Paragraphs 4-24 to 4-39

4-24.

4-25,

the Schmitt-trigger tube

3 volts below cut-off. Operation therefore requires an input signal of at least 3 volts peak amplitude.

4-

sine wave of 2.1 volts rms (3.0 volts peak).

probe to pin

scope.

ADJUSTING EXTERNAL SYNC SENSITIVITY,

In

the no-signal condition the input section of

V1

is

biased approximately

of

the sync circuit

26. To adjust the sensitivity of the trigger:

IN

a. Drive the SYNC

connector with a 1000 cps

b. Connect oscilloscope through a law-capacity

See figure 4-4.

c.

6

of V1.

R10 to obtain a square-wave on oscillo-

Turn

megacycles.

This corresponds to

a

rise time of approximately 0.012 microseconds. Approximate rise time of an oscilloscope can be calculated by dividing

is

bandwidth into 0.35. For example, if bandwidth mc, the rise time

4-33, When using an oscilloscope with sponse (rise time

still

be read in the rise time of the 75

is

approximately 0.012 microsecond.

a

=

0.012 microsecond),

30 mc re-

an

error will

52

output. The

30

true rise time of the 211A alone can be conveniently

is

computed, however. The formula

t

=

0

I

dtt

-

2

t2

where

to

tl

t2

=

= =

as follows:

actual rise time in microseconds

observed rise time

known rise time of

oscilloscope verti-

d. Turn

R10 to maximum cw and waveform on

cal amplifier

oscilloscope should disappear.

4-34. As an example, the measured values takenfrom

a

e. Adjust

R10 counterclockwise until negative pulse

just appears on oscilloscope.

is

f. This

correct adjustment of the SYNC sensi-

production unit which are shown in the waveform

charts figure

0.023

psec. The actual rise time

4-7A and 4-7B, indicate a rise time of

is

computed below:

tivity control for reliable external synchronization

a

positive-going pulse or sine wave signal having

with

a

minimum amplitude of 5 volts peak.

to

=

4-27.

4-28. The 211A

WAVEFORM OBSERVATION AND MEASUREMENT*

is

very reliable in

that

it

is

for the most part a "go" or "no go" type of circuit. If the unit

is

operating normally, there

that

the rise time of the leading edge of the square

is

wave

is

a

slower than rated.

due to weak tubes, however,

part

has

been damaged and has changed value, the

is

very little chance

Generally slow rise time

it

is

possible that

if

0.0196 microseconds actual risetime Square Wave Generator.

4-35. The typical waveforms shown in figure 4-7A, B can be observed with the following equipment:

($9

a. Oscilloscope:

Model 170A with 162F Preamplifier, or Tektronix Type 545A with type amplifier (use either instrument).

($9

b. Probe:

Model AC-21A

(10:l) or AC-21C (50:l).

of

the 211A

K

Pre-

rise time may be less than rated. 4-29.

The rise time

of

the 600-ohm output

is

less

than 0.1 microseconds with the OUTPUT AMPLITUDE

set at

maximum. Reducing the setting of the 600

SZ

OUTPUT AMPLITUDE control to approximately a dial setting of "2" will give a voltage level approximately

the same

as

that from the 75-ohm output jack.

The rise time will be improved due to reduced shunting effect of circuit capacity.

the same as that from the 75-ohm output jack

A rise time of essentially

is

pos-

sible under these conditions.

4-30. A low capacity probe specifically designed for

high

frequencies should be used for observing waveforms. Certain probes may tend to ring at a high frequency when hit with very fast pulses.

4-36. Use of operating order as far as high frequency signals are concerned, may cause the

slightly uneven across the top, even though fectly square determine the 211A

square wave from the 75-ohm output. 4-37. Since the 211A square wave

with respect to ground, the highest part of the square wave must be in fact ling, ground the probe and note the position of the trace on the graticule, then note of the square wave exceeds the point of zero volts. it does, the oscilloscope

an

oscilloscope which

1

mc square wave to look

at

low frequencies. A simple check to

if

the trouble

is

to use d-c couplingwhen observing a 1 mc

is

in the oscilloscope or in

at

zerovolts. While ond-c coup-

is

at fault.

is

not in good

it

is

negative going

if

the highest part

per-

If

4-31. To measure the rise time of the 600 which

is

approximately 0.1 microsecond,

scope with a bandwidth of 10 megacycles quate. Excellent oscilloscopes for the

@Model 160B or 150A.

TOACCURATELY MEASURE THE RISE TIME

4-32. OF THE 75

HIGH

tical amplifier should

52

OUTPUT REQUIRES

SPEED OSCILLOSCOPE. The oscilloscope ver-

have a bandwidth of at least 30

is

this

purpose are

AN

EXTREMELY

SZ

output,

an

oscillo-

quite ade-

4-38.

one of the tubes in the

If

the oscilloscope

is

proven not to

be

at fault,

211Ais weak and should be re-

placed. The two situations are shown in figure 4-6.

4-39. When observing a

1

mc square wave there may be a very small amount of overshoot or undershoot at the leading edge of the bottom of the negative portion

is

of the square wave. This

normal. A shorted C24

will cause approximately 5-10 volts drop in amplitude

of the 600

output and a slightly slower rise time.

Section

IV

Paragraphs 4-40 to 4-42

4-40. ity or

R57

the square wave. itors

If

C19, C20, C21, or C22 have too much capac-

if

the associated resistors R52, R53, R56, and

have low resistance, there will

If

the capacity

is

low or the associated resistors have for some

be

overshoot on

of

any of these capac-

reason increased in resistance, there will be under-

of

shoot or rounding of the corner

the leading edge of the square wave. Before any changes in these parts are made, however, every effort should be made to

this

is

correct the trouble with good tubes as

the nor ma1 reason for poor waveshape. Unless these parts have changed value, these circuits should not need adjustment. No adjustment should be attemptedunless a

30 megacycle oscilloscope

when the compensation

is

correct.

is

available to determine

CAUTION

To avoid accidental damage, always turn off power before removing or installing circuit board assemblies.

-

Model 112A

4-41.

4-42. The Model 211A etched circuit boards;

SERVICING

ETCHED

is

i.

CIRCUIT

supplied with single-sided

e., conductive material

BOARDS.

located only on one side of the boards. Funneled eyelets insure good electrical contact between component leads and conductor. When servicing these boards, the following general rules should be followed:

a.

DO NOT APPLY EXCESSIVE HEAT to compo-

nents or conductor.

b.

To remove damaged components, clip leads near component; then apply heat and remove leads with a straight upward motion.

.

c. Use a toothpick or wooden splinter to clean compo-

nent mounting holes before installingnew components.

d.

APPLY SOLDER FROM CONDUCTOR SIDE of

board to insure good contact between eyelets,

comp.0-

nent lead, and conductor.

is

211

SYNCHROSCOPE

AT FAULT

A

Figure 4-5. 75-ohm Output Waveform which has Defects on Positive Portion,

as Observed with a DC Coupled Oscilloscope

RO

Model 211A

Section IV

Figure 4-6

IKC SQUARE WAVE

I MC SQUARE WAVE

600-ohm output

Amplitude control

set at "10"

pec/cm

0.1 50 volts/cm

600 -ohm output

Amplitude control

set at approx. "2"

5

volts/cm

75-ohm output Controls set for

maximum output

5

volts/cm

7 5-ohm output

0.02

psec/cm

X50 attenuation

10 megohm probe

used Gain adjusted to

give 10 divisions vertical deflection for ease in measuring rise time leading edge square wave

75-ohm output

of

V6

I

KC

200 kS/CM 082 pS/CM

SV/CM

2

SV/CM

V6 PIN6

200 pS/CM Oa2 bS/CM 20V/CM 20V/CM

V8

200 WS/CM 0.2 kS/CM 5 V/CM

PIN9

5 V/CM

I

MC

Same test conditions as for

Note that rise time

is

as at

Figure 4-6A

1

kc

NOTE: Since the circuit

the same at 1 mc

1

kc

Figure 4-6. Model 211A Waveforms

waveforms on

is

balanced, the

V7 and V10 are the

same as those on V6 and V8.

Figure 4-6B

NOTES. I. CONDITIONS OF MEASUREMENT

ALL VOLTAGES AND RESISTANCES MEASURED TO CHASSIS WITH 20.000!llVOLT MULTIMETER UNLESS OTHERWISE SPECIFIED

BY

ASTERISK(t1

lt

DC VOLTAGES SO MARKED MEASURED WITH 122 MEGOHM

INPUT IMPEDANCE VTVW

2. CONTROL SETTINGS RANGE

.

XI00

FREQ DIAL : I0

3 li.looon

M = YEGOHM N.C = NO CONNECTION

:*-

230VAC

N.C. 23lvAC

lad

'5

2

4'

19K

-

Figure

4-7.

Voltage

and

Resistance

Diagram

SYNC TRIGGER

---

--CIS

".OW~

,

-

('

R37

.-

c.

h)

w

*

R3

3900

BROWN

-

1

[6S"q

I

BRW*

-

.OIlIF

540

IVSI

.Id

8.

..l*.U

.~.,..d

,on.

7:fLq

R98

5K

IV

MWL~.~ACKUD

I.

in,."d.d

lor

1.1

.I

).

*.

b.

.l*,...L~d

"..a

rn"."

cmmgn,.

6.

opn,i.m

.*..w..

ro"..",

-

-195v

mur*wr

3u*.

n,

h.

RY) 2700

.r

R12 422

L4

0

41

-TO

-9.5

-4

-5

"'

-5

-4

"6

TO TERMINALS

1

67

OF L8

.

R87*

am

.22UF FREO

V6

TO

6.3AG

IGRNDI*

Osl

6C4

CLAMP

CONTROL

IRI.6EI

-

SWITCH

.OIpF

RW

9a5K

@,

R31 50K

R32

I.03IY

ULIIU)ATE

IOOO'L

RME

.2PUF

XMO

TO

V7-1

colnsm

,*I.

."d

"."I

..F.od.<.d

*.~I.ll

111.-,,-

dn-il

m.,*.ur.

Figure

4-8.

Multivibrator

and

Power Supply

-195v

leoosl

S2

-1

0------.,

I.OWI

.

.*

.

-19sv-

C 17

R4 0

IM

CLIPPER AMPLIFIER OUTPUT AMPLIFIER

RSI

R47 470

2000

R46 2aX)

at

R45

47

,-I

R43

27K

-Jo

V6

6CL6'"

I

-l60

,

R69

22OK

R7T 371.3

1

NOTES: I

CONTROL SETTINGS:

75 ATTEN - 600s

RANGE -XI00

2.

+

0.

&.

fl

OF

PREMlVYNBEMPEU97MAYBEUSmlNRYX

FREQ DIAL- I0

ALL DC VOLTAGES MEASURED TO CHASSIS WITH A VACUUM TUBE VOLTMETER HAVING 122 MEGOHM INPUT IMPEDANCE OPTIMUM VALUE SELECTED AT FACTORY. AVERAGE VALUE SHOWN OHMS UNLESS OTHERWISE NOTED.

PANEL

6CL6 IF OFSIRED.

CAPACITY IN PF. RESISTANCE IN

cmmo~

CHISSlS

LPANEL

I

MARKING

1180

371.3

41

-

I

Figure

4-9.

Output

Section

-m-

(4)

REAR mEOFWAFfRS SHOWN.

(8)

FACING FRONTOF PANEL ROTATION

OF

RANGE

IN

TO

Omrs

swrcn

CCW

UNLESS

KNOB

EWIVALENT

ATION OF ROTORS SHOWN AM.

(C)

CAPACITANCE IN U!JF UNLESS OTHERWISE SHOWN.

(0)

RESISTANCE

OTHERWISE SHOWN.

,

CW

ROT-

I

L

---,

R21

,,&

@

-------

PANELEND

OF

SWITCH

I

-l

Figure

4-10.

Range

Switch Detail

Section

IV

Figure 4-11

Model 211A

R75 91.67

M6 91.67

RIB 91.67

R79 91.67

RBI 91.67

40DB

-NOTES-

swlnn

OF

KNOB

IS

ROTORS SHOWN

(A1

REAR FACE OF WAFERS SHOWN FACING FRONTOF PANEL,CW ROTATION OF

(8)

ATTENUPTOR

TO CCW ROTATION

IC1

CAPACITANCE IN UPF

(0)

RESISTANCE IN OHMS

EQUIVALENT

BELOW.

R72, , -75

OUTPUT AMPLITUDE CONTROC

SWITCH SHOWN IN 6006 POSITION

Figure 4-11. Attenuator Switch Detail

Model 211A

Section

Paragraphs 5-1 to 5-7

V

SECTION

REPLACEABLE PARTS

5-1.

INTRODUCTION.

5-2. This section contains information for ordering replacement parts. Table 5-1 numerical order of their reference designators and indicates the description and

part, together with any applicable notes. Table 5-2

lists parts in alpha-numerical order of their

numbers and provides the following information on

each part:

a.

Description of the part (see

below).

b. Manufacturer of the part in a five-digit code;

see list of manufacturers in appendix

c.

Typical manufacturer's stock number. d. Total quantity used in the instrument (TQ column). e. Recommended spare part quantity for complete

maintenance during one year of isolated service column).

5-3. Miscellaneous parts not indexed in table 5-1 are listed at the end of table 5-2.

lists

parts in alpha- inquiry either to your authorized Hewlett-Packard

$3

stock number of each

'$3

list

of abbreviations

stock

(RS

V

5-4.

ORDERING INFORMATION.

5-5. To order a replacement part, address order or sales representative or to

CUSTOMER SERVICE

Hewlett-Packard Company 395 Page Mill Road Palo Alto, California,

or, in Western Europe, to

Hewlett-Packard S. Rue du Vieux Billard No. Geneva, Switzerland.

5-6. Specify the following information for each part:

a.

Model and complete serial number of instrument.

b. Hewlett-Packard stock number.

c. Circuit reference designator.

d. Description.

5-7. To order a part not listed in table 5-1, give complete description of the part and include

tion and location.

A.

1

its

func-

a

=

assembly F =fuse

A

B

=

motor

C

=

capacitor

=

diode

CR

=

delay line

DL DS

=

device signaling (lamp)

E

=

misc electronic part

a

=

amperes

bp

=

bandpass

bwo = backward wave

c cer cmo coef com = common comp = compsition conn = connection crt

d:p

4

0)

A A

o

oscillator

=

carbon

=

ceramic

=

cabinet mount only

=

coefficient

=

cathode-ray tube

=

deposited

meeting Electronic Industries' Association standards will normally result in

instrument operating within specifications; tubes and transistors selected for best performance will be supplied if ordered by @stock numbers.

REFERENCE DESIGNATORS

FL

=

filter

J

=

jack

K

=

relay

L

=

inductor M = meter MP = mechanical part

elect = electrolytic encap= encapsulated

=

farads

f fxd =fixed

Ge

=

germanium

=

ground (ed)

grd h

=

henries

=

mercury

Hg

impg = impregnated

=

incandescent

incd

=

insulation (ed)

ins

K

=

kilo = 1000

lin

=

linear taper

log

=

logarithmic taper

m

=milli=10-~ M = megohms ma

=

milliamperes

p

=

micro

minat = miniature

=

mfgl mfr = manufacturer

=

metal film on glass

ABBREVIATIONS

mtg my

NC Ne NO NPO

nsr

obd = order

PP piv

rect

plug transistor

resistor thermistor switch transformer

=

mounting

=

mylar

=

normally closed

=

neon

=

normally open

=

negative positive zero (zero temperature coefficient)

=

not separately

replaceable

scription tog

=

peak

=

printed circuit EIA = Tubes or transistors board picofarads

10-12 farads peak- to- peak peak inverse voltage position(s) polystyrene

potentiometer

=

rectifier

'

by

de-

=

vacuum tube, neon

V

hlb, photocell, etc.

W

=

cable

X

=

socket

=

fuseholder

XF

WS = lampholder

Z

=

network

rot

=

rotary

=

root- mean- square

rms rmo

=

rack mount only

S-b = slow-blow

Se

=

selenium

=

section(s)

sect Si = silicon

=

silver

sil sl

=

slide

td

=

time delay

Ti0 = titanium dioxide

2

=

toggle

to1 = tolerance

=

trimmer

trim twt = travelingwavetube

=

variable

var w/ = with

W

=

watts

ww

=

wirewound

w/o = without

*

=

optimum value selected at factory, average value shown (part may be omitted)

Section V Table 5-1

Model 211A

Table 5-1. Reference Designation Index

Circuit

Reference

C1 C2 C3 C4 C5

C6 C7 C8 C9 C10

C11 C12 C13 C14

C15, C16

C17, C18 C19, C20 C21, C22 C23, C24 C25

($3

Stock

0160-0051 0140-0033 0140-0035 0140-0090 0140-0018

0

140-0'009 0160-0022 0160-0018 0140-0035 0140-0090

0140-0018 0140-0009 0160-0022 0160-0018 0150-0012

0170-0002 0140-0098 0140-0099 0150-0012 0180-0025

No.

Description

C: fxd, my, 0.47 pf C: fxd, mica, 5 pf C: fxd, mica, 39 pf C: fxd, mica, 200 pf C: fxd, mica,

C: fxd, mica, 0.01 C: fxd, my, 0.1 C: fxd, my, 0.22 C: fxd, mica, 39 pf C: fxd, mica, 200 pf *5%, 500 vdcw

C: fxd, mica, C: fxd, mica, 0.01 C: fxd, my, 0.1 C: fxd, my, 0.22 C: fxd, cer,

C: fxd, my, 2 C: fxd, mica, 200 pf C: fxd, mica, C: fxd, cer, 0.01 C: fxd, elect, 4 sect, 20

1000 pf *5%, 500 vdcw

0.01 pf *20%, 1000 vdcw

pf *20%, 400 vdcw

1000 pf

*lo%,

rt20%, 500 vdcw

*5%, 500 vdcw

pf *5%, 500 vdcw

pf *5%, 600 vdcw

pf

*lo%,

*5% , 5OOvdcw

pf *5%, 500 vdcw

pf *5%, 600 vdcw

pf

*lo%,

*I%,

pf *20%, 1000 vdcw

#

400 vdcw

500 vdcw

pf/sect. , 450 vdcw

Note

C26 C27 C28

thru

C33, C34

CR1

F1

I1

J1,

52

C32

0160-0013 0180-0011 0140-0004 0150-0012

1910-0009

2110-0015

2110-0021

2140-0012

1250-0118 1250-0083

C: fxd, my, 0.1 C: fxd, elect, 20 pf, 450 vdcw C: fxd, mica, 15 pf C: fxd, cer, 0.01

Diode,

Fuse, cartridge: 2.5 amp, s-b

Fuse, cartridge: 1.25 amp, s-b

Lamp, minat

Connector: BNC (rack model) Connector: BNC (cabinet model)

Ge

(for 115

(for 230 V operation)

V

pf *10%, 400 vdcw

*lo%,

pf *20%, 1000 vdcw

operation)

:

2 pin base, 6.3 V, 0.15 amp, #12

500 vdcw

#

See

introduction to this section

00093-3

Model 211A Section

Table 5-1

1

Circuit

Reference

@

Table

Stock

5-1. Reference Designation Index (conttd)

No.

Description

#

Note

V

L1

L2 L3 L4, L5

L6, L7

L8

P1

Rl R2

R3

R4 R5

R6 R7 R8 R9

RlO

9140-0026 9140-0022

9140-0025 9140-0024

211A-60A

8120-0050

0687-1051 0690-1041 0690-2731 0687-1021 0690-2221

0693-4721 0693-3921 0687-3341 0690-8231 2100-0084

Inductor: RF, 6.8 ph

Inductor: RF, 500 ph

Not assigned Inductor: RF, 4.7 Inductor: RF, 0.68 ph

Inductor: RF, (special)

Cord, power

R:

fxd,

CO~P,

R:

fxd, comp, lOOK ohms

R:

fxd, comp, 27K ohms

R:

fxd, comp, 1K ohms

R:

fxd, comp, 2.2K ohms i10%,

R:

fxd, comp, 4.7K ohms

R:

fxd, comp, 3.9K ohms

R:

fxd, comp, 330K ohms

R:

fxd, comp, 82K ohms

R:

vary comp, 50K ohms *20%, 1/3

1M

ph

*lo%,

1/2

*lo%,

W

1

1/2

1

W

1

W

2

W

2

W

1/2

W

Rll

R12 R13 R14 R15

R16 R17 R18 Rl9, R20 R21

R22 R23 R24 R25 R26

R27

0687-4701 0727-0073 0687-4701 2100-0079 0730-0079

0730-0087 0730-0096 0730-0118 2100-0013 2100-0063

0730-0045

2100-0013 2100-0074 0730-0079

0730-0087

0730-0096

R:

fxd, comp, 47 ohms a0%, 1/2

R: fxd, dep c, 422 ohms

R:

fxd, comp, 47 ohms

R:

vary comp, 250 ohms

R:

fxd, dep c, 216.3K ohms

R: fxd, dep c, 370K ohms

R:

fxd, dep c, 683.7K ohms

R:

fxd, dep c, 3.05M

R: vary comp, lin, 50K ohms *20%

R:

vary comp, lin, lOOK ohms

R:

fxd, dep c, 30.5K ohms

R:

vary comp, lin, 50K ohms *20%

R:

vary comp, lin, 1M E30%

R:

fxd, dep c, 216.3K ohms

R:

fxd, dep c, 370K ohms

R: fxd, dep c, 683.7K ohms

*I%,

*lo%,

*lo%

*l%, 1 W

*l%,

*I%,

*l%, 1 W

*I%,

*l%,

*I%,

1/2 1/2

1

W W W

W

1

W

1

W

#

See introduction to this section

5 -3

Section Table 5-1

V

Table 5-1. Reference Designation

Model 211A

Index (contld)

Circuit

Reference

R28 R29 R30

R31

R32

R33 R34 R35 R36 R37

R38 R39, R40 R41 R42 R43

R44, R45 R46 R47

R48, R49

R50, R51

($3

Stock No.

0730-0118 0730-0017 0730-0065 2100-0084 0730-0106

0687-4701 0727-0073 0811 -0004 0687-4701 2100-0130

0690 -2721 0687-1051 0687-6831 0687-8231 0687-2731

0687-4701 0763-0001 0771-0002 0687-4701 0763-0001

Description

R:

fxd, dep c, 3.05 M

R:

fxd, dep c, 1.5K ohms

R:

fxd, dep c, 90.5K ohms

R:

var, comp, 50K ohms *20%, 1/3

R:

fxd, dep c, 1.031M

R:

fxd, comp, 47 ohms

R:

fxd, dep c, 422 ohms

R:

fxd,

ww,

540 ohms

R:

fxd, comp, 47 ohms

R:

var,

ww,

50K ohms

R:

fxd, comp, 2.7K ohms

R: fxd, comp, 1M

R:

fxd, comp, 68K ohms

R:

fxd, comp, 82K ohms

R:

fxd, comp, 27K ohms

R:

fxd, comp, 47 ohms

R:

fxd, mfgl, 2K ohms

R:

fxd, mfgl, 470 ohms

R:

fxd, comp, 47 ohms

R:

fxd, mfgl, 2K ohms

*I%,

*lo%,

*I%,

*l%,

*lo%,

*l%,

*lo%,

1/2

*lo%,

flO%,

*lo%,

*I%,

*lo%,

*I%,

1

*I%,

*l%,

1

5

*lo%,

2

W

8

W

#

1

W

1/2 1/2

1/2

W

1/2 1/2

1/2

W

4

1/2

W

1

W

Note

W

W W

W

W W W

W

R52, R53

R54 R55 R56, R57 R5 8

R59

thru'

R65 R66 R67 R68

R69 R70 R71 R72 R73

R64

0730-0091 0763-0001 0730-0007 0730-0066 0730-0007

0687-4701 0771-0002 0690-2711 0771-0002 0687-4701

0687-2241 0687-4701 2100-0075 2100-0076 0727-0324

R:

fxd, dep c, 479K ohms

R:

fxd, rnfgl, 2K ohms

R:

fxd, dep c, 230 ohms

R:

fxd, dep c, 95.5K ohms

R:

fxd, dep c, 230 ohms

R:

fxd, comp, 47 ohms *lo%, 1/2

R:

fxd, mfgl, 470 ohms

R:

fxd, comp, 270 ohms

R:

fxd, mfgl, 470 ohms

R:

fxd, comp, 47 ohms

R: fxd, comp, 220K ohms

R:

fxd, comp, 47 ohms

R:

var, comp, dual,l.2K ohms

R:

var, comp, 75 ohms

R:

fxd, dep c, 91.67 ohms

*l%,

*I%,

*l%, 1 W

*lo%,

*lo%

*lo%,

do%,

*lo%

2

*I%,

,

1/2

*l%,

1

W

1

W

4

W

1

W

4

W

1/2

W

1/2

W

*lo%

1/2

W

#

See

introduction to this section

00093-3

Model 211A Section

Table 5-1

Table

5-1. Reference Designation Index (cont 'd)

V

Circuit

Reference

R74 R75, R76 R7 7 R78, R79 R80

R81 R82 R83 R84 R85

R86 R87

R88, R89 R90 R91

@

Stock

0727-0323 0727-0324 0727-0323 0727-0324 0727-0323

0727-0324

0690-1241 0690-3331 0690-2251

0690-1021 0818-0008

0693-4701 0690-4731 0690-3341

No.

R:

fxd, dep c, 371.3 ohms

R:

fxd, dep c, 91.67 ohms

R:

fxd, dep c, 371.3 ohms

R:

fxd, dep c, 91.67 ohms

R:

fxd, dep c, 371.3 ohms

R:

fxd, dep c, 91.67 ohms

Not assigned

R:

fxd,

comp, 120K ohms

R:

fxd, comp, 33K ohms

R:

fxd,

CO~P,

R:

fxd, comp, 1000 ohms

R:

fxd,

ww,

Optimum value selected average value shown

R:

fxd, comp, 47 ohms

R:

fxd, comp, 47K ohms

R:

fxd,

CO~P,

2.2M

800 ohms

330Kohms

Description

*l%,

a%,

*l%,

*l%

*I%,

*lo%,

1

*lo%,

40

at

*lo%,

#

1/2 W 1/2 W

1/2 W

1/2

,

1/2 W

1

W

1

W

1

W

factory

2 W

1

W

1

W

Note

W

R92 R93 R94

thru

R97 R98

R99

RlOO

S1

S2

S3

T1

V1 V2, V3 V4 V5

R96

2100-0063 0690-2241

0687-2211 2100-0082

0690-2701

0690-4731

211A -19W 211A-19A 3101-0001

9100-0062

1932-0021 1923-0030 1930-0013 1921-0005

R:

var, comp, lin, lOOK ohms

R

fxd, comp, 220K ohms

Not assigned

R:

fxd, comp, 220 ohms

R:

var, comp, 5K ohms *20%, 1/2 W

R

fxd, comp, 27 ohms

Optimum value selected average value shown

R:

fxd, comp, 47K ohms

Assy, range switch Assy, attenuator switch

hitch,

Transformer, power

Tube, electron: Tube, electron: 6CL6 or 6197 Tube, electron: Tube, electron: 6C4

tog: SPST

6BQ7A

6AL5

*lO%,

*lo%,

at

factory

*lo%,

1

1/2

W

1

W

#

See introduction to this section

'5 -5

Section Table

V

5-1

Table

5-1.

Reference Designation Index (cont'd)

Model

211A

Circuit

Reference

V6

thru

V11 V12 V13

V14 V15

XV1

thru

XV3 XV4, XV5 XV6

thru

XVll XV12, XV13 wi4, ~~15

@

Stock No.

1923-0030

1930-0020 1932-0019 1923-0027 1940-0001

1200-0062 1200-0053 1200-0062 1200-0020 1200-0009

#

Tube, electron: Tube, electron: Tube, electron: Tube, electron: Tube, electron:

6CL6

or

5V3 6AS7GA

6BH6 5651

6197

Socket, tube: 9 pin minat (for pc) Socket, tube: Socket, tube:

7

pin minat (for pc)

9

pin minat (for pc)

Socket, tube: octal

7

Socket, tube:

Pin minat

Note Description

#

See

introduction to this section

00093-3

Model 211A

Section

Table 5-2

V

Table 5-2. Replaceable

Description

Assy , attenuator switch Assy, range switch Inductor: RF, (special)

C: fxd, mica, 15 pf C: fxd, mica, 0.01 C: fxd, mica, C: fxd, mica, 5 pf *20%, 500 vdcw C: fxd, mica, 39 pf

C: fxd, mica, 200 pf C: fxd, mica, 200 pf C: fxd mica, C: fxd, cer, 0.01 C: fxd, my,

C: fxd, my, C: fxd, my, 0.1 C: fxd, my, 0.47 C: fxd, my, 2 C: fxd, elect, 20

1000 pf f5%, 500 vdcw

1000 pf *l%, 500 vdcw

0.1 pf

0.22

pf *20%, 400 vdcw

#

*lo%,

pf *5%, 500 vdcw

*5%, 500 vdcw

*I%,

pf *20%, 1000 vdcw

*lo%,

pfflO%,

pf *5%, 600 vdcw

pf

*lo%,

pf, 450 vdcw

500 vdcw

400 vdcw

Parts

I

Mfr.

76433 04062 76433 7 643 3 76433

04062 04062 04062 56289 56289

56289 56289 00656 84411 56289

1

Mfr.

Part

No.

C: fxd, elect, 4 sect, 20

450 vdcw

R:

fxd, comp, 1K ohms f10%, 1/2

R:

fxd, comp, 1M *lo%, 1/2

R:

fxd, comp, 220 ohms

R:

fxd, comp, 220K ohms

R:

fxd, comp, 27K ohms

R:

fxd, comp, 330K ohms *lo%, 1/2

R:

fxd, comp, 47 ohms

R:

fxd, comp, 68K ohms *10%, 1/2

R:

fxd, comp, 82K ohms

R:

fxd, comp, 1K ohms *lo%,

R:

fxd, comp, lOOK ohms

R:

fxd, comp, 120K ohms *lo%,

R:

fxd, comp, 2.2K ohms

R:

fxd, comp, 220K ohms *lo%,

pf/sect,

W

*lo%,

&lo%,

*lo%,

*lo%, *lo%,

1/2

1

W

1/2

W

1

W

1

W

1

W

1

W

56289

01121 01121 01121 01121 01121

01121 01121 01121 01121

#See introduction to this section

5-7

Section

Table 5-2

V

Table 5-2.

.Replacable

Parts

Model 211A

(contld)

@stock No.

0690-2251 0690-2701

0690-2711

0690-2721 0690-2731

0690-3331

0690-3341 0690-4731 0690-8231 0693-3921

0693-4701 0693-4721 0727-0073

.0727-0323

0727-0324

Description

R:

fxd, comp, 2.2M ohms

R:

fxd, comp, 27*ohms

R fxd, comp, 270 ohms R:

fxd, comp, 2.7K ohms

R:

fxd, comp, 27K ohms

R:

fxd, comp, 33K ohms

R:

fxd, cornp, 330K ohms

R:

fxd, comp, 47K ohms

R:

fxd, comp, 82K ohms

R:

fxd, comp, 3.9K ohms

R:

fxd, comp, 47 ohms

R: fxd, comp, 4.7K ohms

R:

fxd, dep c, 422 ohms

R:

fxd, dep c, 371.3 ohms

R:

fxd, dep c, 91.67 ohms

#

*lo%,

&lo%,

*l%,

*lo%,

1

*lo%,

*lo%, *lo%, *lo%,

*lo%,

2

*lo%,

1/2

*I%,

*l%,

1

W

1

2

W

2

1/2 1/2

W

W W

W

Mfr.

01121

01121 01121 01121 01121 01121

01121. 01121 19701 19701 19701

Mfr.

Part

No.

GB2251 GB2701

GB2711 GB2721 GB2731

GB3331 GB3341 GB4731 GB8231

HB3921

HB4701

DC~/~BR~

DC~/~CR~ obd#

DC~/~CR~

obd#

RS

TQ

1

11

1

11

1

2

11

2

1

11

1

2

1

3

2

6

0730-0007 0730-0017 0730-0045 0730-0065 0730-0066

0730-0079 0730-0087

0730-0091

0730-0096

0730-0106

0730-0118 0763-0001 0771-0002 0811-0004 0818-0008

1200-0009

R:

fxd, dep

R:

fxd, dep c, 1.5K ohms

R:

fxd, dep c, 30.5K ohms

R:

fxd, dep

R; fxd, dep

R; fxd, dep c, 216.3K ohms R:

fxd, dep c, 370K ohms R: fxd, dep c, 479K ohms R: fxd, dep c, 683.7 ohms

R:

fxd, dep c, 1.031~*1%,

R:

fxd, dep c, 3.05M

R:

fxd, mfgl, 2K ohms

R:

fxd, mfgl, 470 ohms R:

fxd, ww, 540 ohms

R:

fxd, ww, 80Pohms *5%, 40

Socket, tube: 7 pin minat

c,

230 ohms

c,

90.5K ohms

c,

95.5 ohms

*l%,

*I%,

*I%, *I%,

*I%,

*l%,

*lo%,

*I%,

*l%,

*I%,

1

W

1

W

2

5

1

W

4

W

1

1 1

W

1 1

1

W

1

W

W W

W

19701 19701 19701 19701 19701

19701 07115 07115

71468 91431

91662

DClR5 DClR5 obd# DClR5 DClR5 obd# DClR5 obd#

DClR5 DClR5 DClR5 DClR5 DClR5

DClR5 obd# TypeN30 LP1-4 obd# OR-40

316PH-3702

obd#

obd# obd# obd# obd# obd#

2

1

1 1

1

2

1

2

1

2

1

2

1

2

1

2

1

4

1 1

3

1

1 11

1

2

#See introduction to this section

00093-3

Model 211A

Table 5-2. Replacable

Parts

Section V

Table 5-2

(contld)

@Stock No.

1200-0020 1200-0053 1200-0062

1250-0083 1250-0118

1910-0009

1921-0005 1923-0027 1923-0030 1930-0013 1930-0020

1932-0019 1932-0021 1940-0001

2100-0013 2100-0063 2100-0074 2100-0075 2100-0076

Description

#

Socket, tube: octal Socket, tube, 7 pin minat, (for pc) Socket, tube, 9 pin minat, (for pc)

Connector: BNC (cabinet model) Connector: BNC (rack model)

Diode,

Ge

Tube, electron: 6C4 Tube, electron:

6BH6 Tube, electron: 6CL6 or 6197 Tube, electron:

6AL5 Tube, electron: 5V3

Tube, electron:

6AS7GA

Tube, electron: 6BQ7A Tube, electron: 5651

R: var, R: R: var, R:

R:

comp, lin, 50K ohms

var, comp, lin, lOOK ohms

comp, lin, 1M *30% var, comp, 1.2K ohms ~10%~ var, comp, 75 ohms

&lo%

Mfr.

71785 91662 91662

91737 91737

98925

80131 80131 80131 80131 80131

80131 80131

80131

71590 11237 11237 01121

01121

Mfr.

Part

No.

51A12272 3708-2-4 3908-2-4

UG-1094/~ 8427

CTP-439

6C4

6BH6 6CL6 6AL5 5V3

6AS7GA 6BQ7A

5651

obd# Type 45 obd# Type45 obd#

JDlN056P122UA JAlNO56S750UA

RS

TQ

2

1

2

1

9

1

0

2

1

11

8

11

11 11 11

4

1

2

1

2100-0079 2100-0082 2100-0084 2100-0130

2110-0015

2110-0021

2140-0012

3101-0001

8120-0050

R:

var, comp, 250 ohms

R:

var, cornp, 5K ohms *20%, 1/2

R:

var, cornp, 50K ohms e0%, 1/3

R:

var,

ww,

lin, 50K ohms

*lo%

*I%,

Fuse cartridge: 2.5 amp, s-b

(for 115 V operation)

Fuse cartridge: 1.25 amp s-b

(for 230 V operation)

Lamp, minat, 2 pin base

6.3

V,

0.15 amp, # 12

Switch, tog: SPST

Cord, power

#See introduction to this section

8

W

01121 11237 11237 98734

71400

24455

34009

70903

JAlN056S251UA

UPM-45 obd#

CPM-45 obd# obd#

MDL-2-1/2

MDL-1.25

GE-12

80994-H

obd#

1

1 1

1

2

1

11

1

10

0

1

.

5-9

Section

V

Table 5-2

Table 5-2. Replacable .Parts

Model 211A

(contfd)

@Stock NO.

9100-0062

9140-0022 9140-0024 9140-0025 9140-0026

AC-1OC AC-1OD

G-74K

G-74N

Z

G-74

G-99K

Description

#

Transformer, power

Inductor: RF, 500

ph Inductor: RF, 0.68ph Inductor: RF, 4.7 ph Inductor: RF, 6.8 ph

MISCELLANEOUS

Assy; binding post, black Assy: binding post, red

Knob: SYMMETRY OUTPUT

AMPLITUDE

Knob: RANGE, 75 ohms

ATTEN

Knob: ATTEN

Window, dial

Mfr.

98734

99848 99848 99848 99848

28480 28480

28480

28480 28480

28480

Mfr.

Part

4113

1500-15-501 203-11 213-11 215-11-68

AC-1OC AC-1OD

G-74K

G-74N G-74Z

G-99K

No.

RS

TQ

11

1

2

1

2

11

0

3

0

2 10

10

211A-40A

1400-0084

1450-0020

1450 -0022

3140-0010

3150-0004 3150-0006

3160-0013

Dial, frequency

Fuseholder

Pilot light, jewel

Lampholder

Fan motor

Filter, Filter,

air, air,

cabinet mount only

Fan blade

rack mount only

28480

75915

72765

73793

82866 82866

06812

211A-40A

342014

14L15

2020AE

G5-CW-ER-6667

807390 obd#

0-04-27-4

10

11

10

1

11

#See introduction to this section

00093-

1

Model 211A

APPENDIX

CODE

The following code numbers are from the Federal Supply Code for Manufacturers Cataloging Handbooks H4-1 (Name to Code) and H4-2 (Code to Name) and their latest supplements. The date of revision and the date of the supplements used appear the bottom of each page. Alphabetical codes have been arbitrarily assigned to suppliers not appearing in the H4 handbooks.

LIST OF MANUFACTURERS (Sheet

1

of

2)

Appendix

at

CODE CODE CODE

NO.

MANUFACTURER

0 0 3 3 4

Humidial Co. Westrex Cors. New York. N.Y. Garlock Packing Co..

Electronic Products Div.

Aerovox Corp. New

Amp, Inc. Harrisburg. Pa.

Aircraft Radio Sangamo Electric

Ordill Division (capacitbn) Marion, Goe Engineering Co. Lor Angeles. Calif. Carl E.

Allen Bradley Co. Milwaukee. Wis. Litton Industries, Inc. Pacific Semiconductors, Inc.

Texas Instruments. Inc.

Transistor Products Div. Dallas. Texas The Alliance Mfg. Co. Alliance, Ohio Chassi-Trak Corp. Indianapolis, Ind.

Pacific Relays. Inc. Van Nuys, Calif.

Amerock Corp. Rockford,

Pulse Engineering Co. Santa Clara. Calif.

Ferroxcube Corp. of America Cole Mfg. Co.

Amphenol-Borg Electronics Corp.

Radio Corp. of America

Semiconductor and Materials Div. Vocaline Co. of America Inc. Hopkins Engineering Co. G.E. Semiconductor Products Dept.

Apex Machine 6 Tool Co. Dayton, Ohio

Eldema Corp. El Monte. Calif.

Transitron Electronic

Pyrofilm Resistor Co. Morristown. N.J.

Air Marine Motors, Inc. Los Angeles, Calif. Arrow, Hart and

Elmenco Products Co. New York, N.Y. Hi-0 Division of Aerovox Myrtle Beach, S.C. Elgin National Watch Co.,

Electronics Division Dymec Division of

Hewlett-Packard Co. Sylvania Electric Prods., Inc.

Electronic Tube Div. Mountain View, Calif.

Motorola.

Prod. Div. Phoenix. Arizona Filtron Co.,

Western Dlvls~on Culver City, Calif. Automatic Electric Co. Northlake, Sequoia Wire 6 Cable

Company Redwood City, Calif. P

M Motor Co. Chicago, Ill.

Twentieth Century Plastics. Inc. Westinghouse Electric Corp.,

Semi-Conductor Dept. Youngwood, Pa. Ultronix. Inc. San Mateo, Calif. lllumitronic Engineering Co.

Barber Colman

Metropolitan Telecommunications Corp.,

Metro Cap. Div. Brooklyn. N.Y.

Stewart Engineering Co. Santa Crux, Calif. The Bassick Co. Bridgeport. Conn.

Beede Electrical Instrument Co., Inc.

Torrington Mfg. Co., West Div. Corning Glass Works

Electronic Components Dept.

Cors. Boonton. N.J.

company

Holmes Corp.

Corn. Wakefield. Mass.

Hegeman Elect. Co.

Inc., Semiconductor

Inc:

Co.

ADDRESS

Colton, Calif.

Camden. N.J. Bedford. Mass.

Los Angeles, Calif.

Beverly Hills, Calif.

Culver City, Calif.

Saugerties, N.Y.

Palo Alto. Calif.

Chicago,

Somerville, N.J.

old Saybrook. Conn.

San Fernando, Calif.

Syracuse, N.Y.

Hartford, Conn.

Burbank. Calif.

Palo Alto, Calif.

Lor Angeles, Calif.

Sunnyvale. Calif.

Rockford.

Penacook, N.H.

Van Nuys. Calif.

Bradford, Pa.

00015-22

Ievised:

NO.

MANUFACTURER

0 7 1

2 6 Digitran Co.

Transistor Electronics Corp. Westinghouse Electric Corp.

Electronic Tube Div. Elmira. N.Y. Avnet Corp. Los Fairchild Semiconductor Corp.

Ill.

March

Continental Device Corp. Hawthorne. Calif.

Rheem Semiconductor Corp.

Shockley Semi-Conductor

Laboratories Boonton Radio Corp. Boonton, N.J.

Engineering Co. Lor Angeles, Calif.

U.S.

Burgess Battery Co.

Sloan Company Burbank, Calif. Cannon Electric Co.

Phoenix Div. Phoenix. Arix. CBS Electronics Semiconductor

Operations, Div. of MeI-Rain Indianapolis. Ind.

Babcock Relays, Inc. Costa Mesa. Calif. Texas Capacitor Co. Houston, Texas Electro Mallory Batter Co of

Canada.

General Transistor Western Corp.

Ti-Tal. Inc. Berkeley, Calif. Carborundum Co. Niagara Falls. N.Y. CTS of

Chicago Telephone of California Inc. Microwave Electronics Corp.

Duncan Electronics. Inc. Santa Ana, Calif. General Instrument Corporation

Semiconductor Division Newark, N.J. Imperial Electronics. Inc. Melabs. Inc. Palo Alto. Calif.

Clarostat Mfg. Co. Dover. N.H. Cornell Dubilier EIec. Corp.

The Daven Co. Livingston, N.J.

De Jur-Amrco Corporation

Delco Radio Div. of G. M. Corp.

E. I. DuPont and Co.. Inc. Wilmington, DeI. Eclipse Pioneer. Div. of

Bendix Avidtior. Corp. Teterboro, N.J.

Thomas A. Edison Industries,

Div. of Electra Manufacturing Co. Kansas City. Mo.

Electronic Tube Corp. Philadelphia. Pa. Fansteel Metallurgical Corp.

The Fafnir Bearing Co.

Fed. Telephone and Radio Corp.

General Electric Co. Schenectadv. N.Y.

G.E.. Lamp Division

General Radio Co. West Concord, Mass. Grobet File Co. of America, Inc.

Hamilton Watch Co. Lancaster, Pa. Hewlett-Packard Co. G.E. Receiving Tube Dept. Owensboro. Ky. Lectrohm Inc. Chicago. P. R. Mallory 6 Co., Inc. Indianapolis. Ind. Mechanical Industries Prod. Co.

Miniature Precision Bearings, Inc.

191

Niagara Falls, Ontario, Canada

C.B.S. Inc.

Assemblims. Inc. Chicago.

~td.

o or onto.

Berne, Inc. Berne, Ind.

Long Island City

McGraw-Edison Co.

Nela Park. Cleveland. Ohio

ADDRESS

Pasadena, Calif.

Minneapolis, Minn.

Angeles, Calif.

Mountain View. Calif.

Mountain View, Calif.

Palo Alto. Calif.

Lowell, Mass.

Ill.

Ontario. Canada

Lor Angeles, Calif.

SO. ~aradena, Calif.

Palo Alto. Calif.

Buena Park, Calif.

So. Plainfield. N.J.

1,

N.Y.

Ind.

Kokomo,

West Orange, N.J.

No. Chicago.

New Britain, Conn.

Carlstadt. N.J.

Palo Alto, Calif.

From: F.S.C.

Ill.

Clifton, N.J.

Ill.

Akron. Ohio

Keene, N.H.

Handl H4-1 Dated H4-2 Dated

NO.

4

2 1 9 0

4

3

9 9

44

6

5 5

4 7 9 0 4 4 8 6

2 0

4 9 9

5 6 Raytheon Company Lexington, Mass. 5 4 2 9 4 5 5 0 2 6 Simpson Electric Co. Chicago, 5 5

9

3 3

5 5 9 3 8 Sorenson & Co., Inc. So. Norwalk. Conn. 5 6 1

3

5 6 2 8 9 5 9 4

4 6 Telex. Inc. St. Paul, Minn.

6

1

7

6

2 1 1 9 Universal Electric Co. Owosso, Mich.

6

4 9 5 9 Western Electric Co.. Inc.

6

5 0 9 2

6

3

4 6 Wollensak Optical Co.

7

0 2

7

0 3 0 9 Allied Control Co., Inc.

7

0 4 8 5 Atlantic India Rubber Works. Inc. Chicago,

7

0 5

6

7

0 9 0 3 Belden Mfg. Co. Chicago,

7

0

9 9

7

1 0 0 2

7

1 0 4 1

7

1 2 1

7

1 2

8 6 Camloc Fastener Corp. Paramus, N.J.

7

1 3 1 3 Allen D. Cardwell Electronic

7

1 4 0 0 Bussmann Fuse Div. of McGraw-

7

1 4 5 0

7

1

4 6 8 Cannon Electric Co. Los Angeles, Calif.

7

1

4 7 1

7

1 4 8 2 C. P. Clare & Co. Chicago,

7

1 5 2

7

1 5 9 0 Centralab Div. of Globe Union Inc.

7 1 7

0

7 1 7

4 4

7

1 7 5 3 A.

7 1 7

8 5 Cinch Mfg. Corp. Chicago.

7

1 9 8 4 Dow corning Corp. h4idland.-~ich.

7

2 1

3

7

2 3 5 4 John E. Fast & Co.

7

2 6 1 9 Dialiqht Corp. Brooklyn. N.Y.

7

2 6 5 6 General Ceramics Corp. Keasbey, N.J.

7 2 7

5

7 2 7

6

7

2 8 2 5

7

2 9 2

7

2 9 8 2 Erie Resistor Corp. Erie, Pa.

7

3 0 6

7 3 1

3

7

3

2

9 3 Hughes Products Division of

7 3 4 4

7

3 5

0

7

3 5

5

7

3 6 8 2 George K. Garrett Co., I'nc.

7

3

7

3 4 Federal Screw Products Co. Chicago,

7 3 7

4

7 3 7

9

book Supplements

January 1962 January

MANUFACTURER

Muter Co. Chicago,

0

C. A. Norgren Co. Englewood, Colo. Ohmite Mfg. Co. Skokie. Polaroid Corp. Cambridge, Mass. Precision Thermometer and

Inst. Co. Philadelphia. Pa.

Shallcross Mfg. Co. Selma. N.C.

Sonotone Corp. Elmsford. N.Y.

7

Spaulding Fibre Co., Inc. Tonawanda, N.Y. Sprague Electric Co. North Adams. Mass.

Union Switch and Signal Div. of

5

Westinghouse Air

Weston Inst. Div. of Daystrom, Inc.

6

Allen Mfg. Co. Hartford, Conn.

3

Amperite Co.. Inc.

8 Bird Electronic Corp. Cleveland, Ohio

Birnbach Radio Co. Boston Gear Works Div. of

Murray Co. of Texas

8 Bud Radio Inc. Cleveland. Ohio

Prod. Corp. Edison Co. St. Louis. Mo.

CTS Corp. Elkhart, Ind.

Cinema Engineering Co. Burbank, Calif.

8 Standard-Thomson Corp

Clifford Mfg. Co.

0

The Cornish Wire Co. New York, N.Y.

Chicaao Miniature Lams Works

0.

Smith Corp., Crowley Div.

6

Electro Motive Mfg. Co., Inc.

8 Girard-Hopkins Oakland. Calif.

5

Drake Mfg. Co. Chicago. Hugh H. Eby Inc. Philadelphia, Pa.

8 Gudeman Co. Chicago,

1

Hansen Mfg. Co., Inc. Princeton. Ind.

8 Helipot Div. of Beckman

Instruments. Inc. Fullerton, Calif. Hughes Aircraft Co.

Amperex Electronic Co., Div. of

5

North American Phillips Co., Inc.

6

Bradley Semiconductor Corp. Hamden. Conn.

9

Carling Electric, Inc. Hartford, Conn.

3

Fischer Special Mfg. Co. Cincinnati, Ohio

3

The General Industries Co.

8rakk Co. Swissvale, Pa.

~i;:

Newport Beach, Calif.

ADDRESS

Ill.

New York. N.Y.

Newark. N.J.

Rochester,' N.Y.

New York, N.Y.

New York. N.Y.

Quincy. Mass.

Plainville. Conn.

Waltham, Mass.

Milwaukee, Wis.

West Orange, N.J.

Willimantic, Conn.

Chicaao.

-.

Chicaso.

-.

Ill.

Hicksville. N.Y.

Philadelphia. Pa.

Ill.

Elyria. Ohio

1962

Appendix

CODE

LIST

APPENDIX

OF

MANUFACTURERS (Sheet

2

of

2)

Model

211A

CODE

NO.

MANUFACTURER

Jennings Radio Mfg. Co. J. H. Winns, and Sons

Industrial Condenser Corp. Chicago, R.F. Products Division of Amphenol-

Borg Electronics Corp. Danbury, Conn.

E. F. Johnson Co. Waseca, Minn. lnternational Resistance Co. Philadelphia, Pa. Jones, Howard B.. Division

of Cinch Mfg. James Knights Co. Sandwich. Kulka Electric Corporation Mt. Vernon. N.Y. Lenz Electric Mfg. Co. Chicago. Littelfuse Inc. Des Plaines, Lord Mfg Co. Erie, Pa. C. W. Micamold Electronic Mfg. Corp.

James J. W. Miller Co. Mo~dnock Mills San Leandro. Calif.

Mueller Electric Co. Cleveland, Ohio

Oak Manufacturing Co. Chicago,

Bendix Pacific Division of

Bendix

Phaostron Instrument and.

Electronic Co. South Pasadena. Calif.

Potter and Brumfield, Div. of American

Machine and Foundry Princeton,

Radio Condenser Co.

Radio Receptor Co., Inc.

Resistance Products Co. Harrisburg, Pa.

Shakeproof Division of Illinois

Tool Works Signal Indicator Corp. Tilley Mfg. Co.

Stackpole Carbon Co. Tinnerman Products. Inc. Cleveland, Ohio Transformer Engineers Pasadena, Calif.

Ucinite Co. Veeder Root. Wenco Mfg. Co. Chicago,

continental-~irt Electronics Corp.

Zierick

Mepco Division of

Sessions Clock Co. Morristown. N.J. Schniher Alloy Products Elizabeth, N.J. Times Facsimile Cor~. New York. N.Y.

Electronic Industries Association

Any brand tube meeting EIA

standards Washington, D.C.

Unimax Switch. Div. of

W. Oxford Electric Corp. Bourns Laboratories, Inc. Riverside, Calif. Acro Div. of Robertshaw

Fulton Controls Co.

All Star Products Inc.

Hammerlund Co.. Inc.

Stevens, Arnold, Co.. Inc.

International

Wilkor Products.

Raytheon Mfg. Co.. Industrial

Components Div.. Industr. Tube Operations Newton,

lnternational Rectifier Corp. Barry Controls, Inc. Watertown. Mass.

Carter Parts Co. Skokie. Jeffers Electronics Division of

Speer Carbon Allen Maquire Industries. Inc. Greenwich, Conn. Sylvania Electric Prod.

Electronic Tube Div. Emporium, Pa. Astron Co. East Newark. N.J. Switchcraft, Inc. Chicago,

Metals and Controls Inc.. Div. of

Texas Instruments.

Spencer Prods. Attleboro, Mass.

Research Products

Corp.

Marwedel San Francisco. Calif.

Millen Mfg. Co.. Inc. Malden, Mass.

Corp. No. Hollywood. Calif.

Inc. Hartford, Conn.

Mfq. Corp.

L.

Maxson Corp.

Instruments, Inc.

Inc. Cleveland. Ohio

CO.

8. DuMont Labs.. Inc.

Inc.,

'lnc..

Gorp.

ADDRESS

San Jose, Calif.

Winchester. Mass.

Chicago,

Ill.

Ill. Ill.

Brooklyn, N.Y.

Lor Angeles, Calif.

Ill.

Ind.

Camden, N.J.

Brooklyn. N.Y.

Elgin,

New York, N.Y.

San Francisco. Calif.

Newtonvillm, Mass.

Philadelphia, Pa.

New Rochelle, N.Y.

Wallingford. Conn.

Columbus

Defiance, Ohio

New York, N.Y.

New Haven. Conn.

El Segundo. Calif.

Ill.

St. Marys, Pa.

Ill.

Chicago.

Ill.

16,

Ohio

Boston. Mass.

Mas.

Ill.

Du Bois. Pa.

N.J.

Clifton.

Madison, Wis.

00015-22

Revised: 3 March

Ill.

CODE

NO.

MANUFACTURER

Rotron Manufacturing Co.,

Vector Electronic Co.

Western Washer Mfr. Co. Carr Fastener Co. Cambridge. Mass.

New Hampshire Ball Bearing. Inc. Pyramid Electric Co. Darlington, S.C.

Electro Cords Co.

Victory Engineering Corp.

Bendix Corp., Red Bank Div. Red Bank. N.J. Smith, Herman H., Inc. Brooklyn. N.Y. Gavitt Wire and Cable Co..

Div. of Amerace Corp. Brookfield, Mass.

Burroughs Corp.,

Electronic Tube Div. Plainfield. N.J.

Model

Eng. and Mfg., Inc.

Loyd Scruggs Co. Festus, Mo. Arco Electronics. Inc. New York, N.Y. A. J. Glesener Co.. Inc.

Good All Electric Mfg. Co. Sarkes

Tarzian. Inc. Bloomington, Ind. Boonton Molding Company Boonton. N.J. R. M. Bracamonte

Koiled Kords, Inc. New Haven.

Seamless Rubber Co.

Clifton Precision Products Radio Corp. of America. RCA

Electron Tube Div. Harrison. N.J.

Philco Corp. (Lansdale Division)

Western Fibrous Glass Products Co. Cutler-Hammer. Inc. Lincoln.

Could-National Batteries. Inc. St. Paul. Minn. General Electric Distributing Corp.

Carter Parts Div. of Economy Baler Co. United Transformer Co. Chicago. 111.

U.S. Rubber Co.. Mechanical

Goods Div. Bearing Engineering Co. San Francisco, Calif. Connot Spring Mfg. Co. San Francisco. Calif.

Radio Materials Co. Chicago, Augat Brothers.'lnc. Attleboro. Mass. Dale Electronics, Inc. Columbus. Nebr.

Elco Corp. Philadelphia. Pa. Gremar Mfg. Co., Inc. K

F Development Co. Redwood City, Calif.

Minneapolis-Honeywell Regulator Co..

Micro-Switch Division Freeport,

Universal Metal Products Inc. Sylvania Electric Prod.

Semiconductor Div. Woburn. Mass. Robbins and Myers, Inc. New York. N.Y. Steve~s Mfg. Co., Inc. Mansfield. Ohio Insuline-Van Norman

Electronic Division Manchester, N.H.

Raytheon Mfg. Co., Industrial Components

Div., Receiving Tube Operation

Raytheon Mfg. Co., Semiconductor Div..

California Street Plant Newton. Mass.

Scientific Radio Products, Inc. Tung-Sol Electric. Inc. Newark. N.J.

~urkss- right

Electronics Div. East Paterson. N.J.

Tru Ohm Prod. Dir. of Model

Engineering and Mfg. Co.

Worcester Pressed Aluminum Corp. Allies Products

Continental Connector Corp. Woodside, N.Y.

Leecraft Mfg. Co., Inc. New York. N.Y. Lerco Electronics, National Coil Co. Sheridan. Wyo. Vitramon, Inc. Bridgeport, Conn.

1962

&

Co.

Ind., Inc.

Corp.,

Corp. Miami, Fla.

Inc. Burbank, Calif.

ADDRESS

Inc.

Woodstock. N.Y.

Glendale. Calif.

Lor Angeles. Calif.

Peterborough. N.H.

Lor Angeles. Calif.

Union, N.J.

Huntington. Ind.

San Francisco. Calif.

Oqallala. Neb.

San Francisco, Calif.

Clifton Heights. Pa.

San Francisco, Calif.

Schenectady, N.Y.

Wakefield. Mass.

dassett

Inc..

From: F.S.C. Handbook

Conn.

Chicago.

Ill.

Lansdale, Pa.

Ill.

Chicago,

Passaic. N.J.

Ill.

Puente. Calif.

Quincy. Mass.

Loveland,

Colo.

Chicago,

Ill.

Worcester, Mass.

H4-1

Dated January

H4-2

Dated January

CODE

NO.

MANUFACTURER

9

5

3

5

4

Methode Mfg. Co.

9 5 9

8 7 Weckesser Co. Chicago, Ill.

9 6 0 6

7

Huggins Laboratories Sunnyvale, Calif. Hi-Q Division of Aerovox Olean. N.Y.

9 6 0 9

5

9 6

2

5

6

Thordarson-Meissner Div. of

Maguire Industries, Inc. Mt. Carmel. Ill.

Solar Manufacturing Co.

9 6 2 9 6 9 6

3

3 0 Carlton Screw Co. Chicago,

9 6

3

4

1

Microwave Associates, Inc. Burlington.,Mass. Ercel Transformer Co.

9 6

5 0 1

Industrial Retaining Ring Co. Irvington, N.J.

9 7 4 6

4

9 7

5

3 9 Automatic and Precision

9 7 9 6 6 9 8 1 4 1

9 9 8 2 9 9 8 4 9

9

9 8 9

9 8 9 7 9 9 1 0 9

9 9 3 1 9 9

9 9 7 0 7 9 9

9 9 8 4 9 9 9 9 9 9

9 9 9

THE FOLLOWING BER ASSIGNED IN THE LATEST THE FEDERAL SUPPLY CODE FOR MANUFACTURERS HANDBOOK.

0 0 0 0

0

0 0 0 0

0 0 0 0 0 0 0 0

0

0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0

0

0 0 0

0 0 0 0 0 0 0 0

0 0

0 0 0

0

0 0 0

0 0

Mfq. Co. Yonkers. N.Y.

CBS Electronics.

Div. of

C.B.S.. Inc.

Axel Brothers Inc.

8

2

0

Francis

L.

7

8 Microdot. lnc. So. Pasadena. Calif.

8

2

9 1

0

5

8 7 3 4 Palo Alto Engineering 8 8

2

1

2

5 Clevite Transistor Prod.

8 lnternational Electronic

3

5

1

5

8

0 0 Delevan Electronics Corp.

8 Wilco Corporation Indianapolis, Ind.

3 4 Renbrandt, lnc. Boston. Mass.

4

2

5

7

F

0

0 0

1 Telefunken (c/o American L Winchester Electronics. Inc.

M Western Coil Div. of Automatic

N P

0 0 0

T Tcras Instruments, Inc.

U

0

W Webster Electronics Co. Inc.

X

Y

Z

0 0

A A British Radio Electronics Ltd. 8 B Precision Instrument Components Co. C C Computer Diode Corp.

E E A. Williams Manufacturing Co. F F Carmichael Corrugated Specialties

0

G G Goshen Die Cutting Service

0

H H Rubbercraft Corp.

1

I

0 0

K K Amatom New Rochelle. N.Y.

L L Avery Label Monrovia, Calif.

0

M M Rubber Eng.

Supplements

Mosley Pasadena. Calif.

Sealectro Corp. Mamaroneck, N.Y. Carad Corp. Redwood City, Calif.

Co., Inc.

North Hills Electric Co. Mineola, N.Y.

Div. of Clevite Corp.

Research Corp.

Columbia Technical Corp.

Varian Associates Palo Alto. Calif. Marshall Industries. Electron

Products Division Pasadena, Calif.

Control Switch Division, Controls Co.

of America

Hoffman Semiconductor Div. of

Hoffman Electronics Corp. Evanston.

Technology Instrument Corp.

of Calif.

H-P

VENDORS HAVE NO NUM-

Malco Tool and Die

Elite) New York. N.Y.

Ind., Inc. Redwood City, Calif.

Nahm-Bros.

Ty-Car Mfg. Co., Inc.

Tower Mfg. Corp. Providence. R.I.

Spruce Pine Mica Co.

Midland

Willow Leather Products Corp.

Birtcher Corporation, Industrial

1962 1962

S~ring Co. San Leandro. Calif.

Metals and Controls Div. Versailles, Ky.

Mfg. Co. Inc. Kansas City, Kans.

Division Monterey Park. Calif.

Development

b

ADDRESS

Chicago,

Ill.

Lor Angeles, Calif.

Oakland, Calif.

Danvers, Mass.

Jamaica, N.Y.

Palo Alto. Calif.

Waltham. Mass.

Burbank, Calif.

New York, N.Y.

El Segundo, Calif.

East Aurora. N.Y.

Newbury Park, Calif.

SUPPLEMENT

Los Angeles. Calif.

Santa Monica. Calif.

Holliston, Mass.

New York. N.Y.

Spruce Pine. N.C.

Washington. D.C.

Van

San Jose. Calif.

Richmond, Calif.

Torrance, Calif.

Hayward. Calif.

Ill.

TC

Newark. N.J.

Nuys. Calif.

Lodi. N.J.

Goshen. Ind.

MODEL 211A

SQUARE WAVE GENERATOR

To

adapt this manual

changes shown in tables.

Instrument

Applies to serial prefixes

ERRATA:

Serial Prefix Make Manual Changes Instrument

all

Manual Serial Prefixed:

Manual Printed: 4/62

to

instruments

ERRATA

Figure

Figure 4-9, Output Section,

Table 5-1, Reference Designation Index,

Table 5-2, Replaceable Parts,

Section

4-8, Multivibrator and Power Supply, F1 and S3: Reverse positions to show F1 connected between S3 and PI. R30: Add asterisk beside R30 and change value to 75K.

S2: Add arrowhead on switch contact which connects 60 DB section of S2 to 7552 OUTPUT

connector

CR1: Change to Diode, Ge, @ Stock No. 1910-0016. R30: Change to Resistor, fixed, deposited carbon, 75K ohms

selected at factory; average value shown. V2, V3: Change V5: Change V6 thru V11:

0730-0065: Change to 0730-0058; R: 1910-0009: 1921-0005: Change to 1921-0030; Tube, electron: 1923-0030: Change to 1923-0066; Tube, electron: Add 1923-0067; Tube, electron: 6CL6; Mfr. 82219; Mfr. Part No. 6CL6; TQ=6; RS6.

Under MISCELLANEOUS,

Change:

IV:

4-43. AIR FILTER 4-44. Inspect air-filter element periodically. restricted and instrument overheats. Proceed as follows:

a. b. Dry element thoroughly.

c. in instrument. Research Products Company No. 3 Filter Coat This adhesive stores or from your local Hewlett-Packard sales office.

d. Install cleaned and coated air-filter element in instrument.

with other

52.

@

Stock No. to 1921-0030.

Change

Change to

G-74N

Add paragraphs 4-43 and 4-44 on page 4-8,

Remove element and wash in detergent and water.

Coat element with light film of filter oil (adhesive) before installing filter

is

available in "Handi-Koter" sprayer cans at most heating supply

serial

prefixes check for

Stock No. to 1923-0066.

($9

Stock No. to 1923-0067.

1910-0016; Diode, Ge; Mfr.

AC-1OC to 5060-0632 AC-1OD to 5060-0633 G-74K to 0370-0032

to 0370-0035

G-74

Z

G-99K to 5040-0600

to 0370-0045

026-

errata

Serial

Prefix Make Manual Changes

@

Stock No. 0730-0058.

fxd, dep c, 75K* ohms

28480; Mfr. Part No. 1910-0016. 6C4; Mfr. 86684. 6CL6; Mfr. 86684; Te2; Rs2.

Clean element before air flow

below, and make

*l%,

1W. Optimum value

*l%,

1W.

is

recommended.

is

Supplement A for

211A-900