Tektronix 2A60 Instrument Reference Book

INSTRUMENT REFERENCE BOOK

for the Tektronix type

2A60

dc-to- lmc amplifier

plug-in unit

For all serial numbers

PE\

• TEK 2A60 IRB 2-24-64

l

©, 1964, Tektronix, Inc., P. 0. Box 500

Beaverton, Oregon. All rights reserved.

2

2-24-64

TEK 2A60 lRB

MPI EXTRACT

MPI MAY 1964

2A60 (also see Interim IRB)

--Accessories included

* American Tel and Tel procedures cal out 560/60/67

* Calibration procedure
* Compatibility with 560 Series

* Designation change

FEN
FEN

SPR-131

061-499
3-30-62
061-188
5-11-62

8-15-62

* History parts list

* Instruction Manual
* Instruction Manual error, SN 432-479

* Test specifications

*Included in IRB.

FEN

061-838
070-263
6-15-62
061-188

TEK 2A60 I RB

2-24-65

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Inter-City Mfg. Co., Inc.

St. Louis II, Mo.

CONTENTS-SALES

CATALOG

Catalog #25 corrections
Characteristics (see manual in
Change in plug-in type designation, 8-15-62
Type 60 amplifier instruction manual correction, 6-15-62

DEMO

American Telephone and Telegraph procedures call out 560/60/67, 3-30-62

COMPATIBILITY

Compatibility with 560 series, 8-15-62
Modified products

ENGINEERING section)

TEK 2A60 PRB 1-16-67

1

9-319

Change No. 2A60-l

INSTRUMENT PERFORMANCE CHARACTERISTIC

CHANGE NOTICE

Instrument Type: ____ 2_A_6o_Pl_. _ug_-_in ________________________ _

Publication affected: ___ C_a_t_a_lo...,g...,_ _________ No. 25

Page: __ 14_7 ______ Item __ Ban_d_w_i_d_t_h_(_AC_LF __ -_3_dB_) _________________ _

~add:

AC LF -3 dB

Dated Apr.

1

66

Reason for change:

Addition to catalog information

1

Approved by: ____ f'-"-__ V_ie _____ • _

~_1_. ________________

(Project Manager}

Eff ective date __ n_/_

2

_9_/_6_6 __ _

CATALOG

CHANGE IN PLUG-IN TYPE DESIGNATION

Sometime in the next few months:

Type 60 will become
Type 63 will become Type 2A63
Type 67 will become Type 2B67

(and price increased to $175)
Type 72 will become Type 3A72
Type 75 will become Type 3A75

The primary reason for the change is to make the
type -designations consistent with the new system.
Examples: 3S76, 3T77, 3A74, 3Al, 3B1, 3B3. Ex-

TYPE 60 AMPLIFIER INSTRUCTION MANUAL CORRECTION FEN 6-15-62

Starting with SN 432, the Type 60 plug-in was
modified to operated V434 and V444 from the reg­ulated DC filament supply, and to delete Hum
Balance control R493.

Information concerning the modification was inad­vertently omitted from the Type 60 Instruction

cept for the 2B67, there will be no electrical differ­enches. The 2B67 will have a one-shot sweep fea­ture added, and its price
to $175. Grey knobs instead of black knobs will be
a distinguishing mechanical difference on all of the
above.

The Flash accompanying the Product Availability
list should alert you when the old types are dropped.
The Types 50, 51, and 59 will be dropped from the
new Catalog, will not be advertised, and will keep
their old designations for the foreseeable future.

Manual until SN480, when the omission was discov­ered and the manual corrected.

Owners of Type 60 plug-ins above SN 432 whose
manual schematics do not agreee with the instru­ment circuitry may order updated schematics, un­der Tek. No. 061-374. There is no charge for one
or two copies.

will increase from $160

SPR-131 8-15-62

TEK 2A60 · IRB

2-24-64

DEMO

AMERICAN TELEPHONE AND TELEGRAPH PROCEDURES CALL OUT 560/60/67

Check Spencer (Detroit) reports
Telephone and Telegraph
vals Instruction Manual" distributed to telephone
offices using panel machine switching equipment
calls out use of the Type 560 with Type 60 and
Type 67 plug-ins as a test instrument.

Although the use of a scope (or American Tel
and Tel' s procedures) is optional with the operating
company - - or the local maintenance engineer --

I

s "Panel Unguarded Inter-

that American

Check reports that use of the scope provides much
more accurate settings than were previously poss­ible with mechanical gauges, etc., and hence more
efficient operation of the local equipment.

Since the American Tel and Tel manual fails to
mention Tek cameras in their "available equipment"
listing,
telco asks for a 560demo. A telephone company will
need a scope camera of some kind for every
scopes or so.

it might pay to haul one along if your local

FEN 3-30-62

6

TEK 2A60 IRB

2-24-64

COMPATIBILITY

COMPATIBILITY WITH 560 SERIES

The type 2A(60) is directly compatible with the

following instruments:

561
RM561
561A
RM561A

*Does not provide digital readout, provides crt

display only.

all sn
all sn
all sn
all sn

565 all sn
RM565 all sn
*567 all sn
*RM567 all sn

8-15-62

TEK 2A60 · IRB

2-24-64

MODIFIED PRODUCTS

Product

2A60
2A60

2A60
2A60

Mod

236G

787B

802R
804Z

Description

1 vertica1 input paralleled rear BNC, long tail and
internal release.
DC output level adjustment.
Vertical changed to BNC.

One vertical paralleled to rear, Delrin.

TEK 2A60 PRB

l 0-12-66

m

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G)

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Inter-City Mfg. Co., Inc.

St. Louis II, Mo.

PERFORMANCE

Power Drain, 5-21-65
Environmental characteristics, 1-23-68

TECHNOLOGY

Operating instructions
Circuit description
Traub leshooting

Calibration procedure

CONTENTS-ENGINEERING

TEK 2A6O RB 2-7-68

PERFORMANCE

POWER DRAIN -- 560 SERIES PLUG-INS

The power supply loading indicated below will vary
somewhat with line-voltage and front-panel control

settings. Where series-regulator shunts are indi­cated, the shunt consists of 2 k in the indicator unit
in series with 0 to 6 k in the plug-in, the series
combination connected between the unregulated sup­ply and the regulated supply (in the -100 v supply,
between the unregulated +supply and ground). The
shunt supplies the extra current drawn bytheplug­in beyond that which can be handled by the series
regulator. The actual amount of shunt current varies
with line-voltage, so if a positive power-supply bus
in the plug-in is opened to take a current reading,
the reading will be in error unless the bus is opened
on the load side of the shunt connection (with the
shunt still connected). The -l00v bus carries the
entire load current, so a current measurement at

Plug-In, SN -100 v, shunt -12.2 V +125v, shunt +300 v, shunt 6.3v AC

(2A)60

101-431

432-up 18

18 -- 0 18

300 18 --

--

Geoff Gass, 5-21-65

the plug-in connector is always correct for this
supply. There is no shunting for the -12.2 v supply.

CAUTION: The values below should not be used to
determine if there is any "extra" power available
in the compartment for other purposes or plug-in
modifications. The values of the shunts, the total
dissipation in the plug-in, the limitations of the in-

dicator (transformer and series regulators) and the
characteristics of the other plug-ins with which a
given plug-in may be used all limit the amount of
power "available" in a given plug-in compartment;
in most cases, there is little or no margin allowed
for extra current drain without modification of the
shunts or circuitry. See 040-0245-00 instructions
and power drain discussioninPRB'sforindicators.

117v

--

23
23

--

--

1.63A

1.03A

0
0

TEK 2A60 IRE

1-23-68

1

Performance - continued

ENVIRONMENTAL CHARACTERISTICS

The 2A60 was engineered before design goals for environmental characteristics
were established. The performance requirements given in the environmental
characteristic sheet are the most accurate figures available without performing
extensive environmental tests. They are to be used as a guide not as an
instrument specification

.

Characteristic

Temperature

Nonoperating
Operating

Altitude

Nonoperating
Operating

Vibration

Operating

Performance

-40 to +65°C
Same as

display

50,000
10,000

0.015
10-50-10 cps
each axis,
resonance or

minutes

oscilloscope
signal

ft.
ft.

inch pk-pk

total

Reauirement Sunnlemental Tn-Fnrme,t-;,-m

Derate maximum operating

used to

(1. 9G),

three minutes at

50 cps,

15 min

55

temperature by 1°C/1000
above 5000 ft.

ft

Shock

Nonoperating

Humidity

Nonoperating

Transportation

Package Vibration
Package Drop

:

2

30G's,
shock in each direction of
three axes;

Qualifies under NSTC test
procedure lA,

(24

1/2 sine,

inch drop)

1-23-68

llms;

total of

Category II

one

six shocks

the

TEK 2A60 RB

TYPE 2A60 AMPLlf IER

INTRODUCTION

The Type 2A60 Amplifier module, Fig. 1, is designed for
use with Tektronix Type 560-Series Oscilloscopes; however,
digital information will not be available on the Type 567
when the Type 2A60 is used. It has a bandpass of de to
equal to or less than -3 dB at one megacycle. Sensitivity is
adjustable in 4 calibrated steps from .05 volt (50 millivolts) to
50 volts per division of deflection and is continuously vari­able, uncalibrated, between these steps and up to about
500 volts per division. Accuracy is within +3

% at each of

Operating Instructions

the calibrated steps. The Type 2A60 module has an approxi­mate input impedance of 1 megohm paralleled by 47 pico­farads. Maximum allowable input signal is 600 volts {de plus
peak ac).

This manual includes operating instructions, circuit descrip­tion, troubleshooting information, and calibration procedures
for the Type 2A60 module. For instructions and information
regarding the oscilloscope as a whole, refer to the oscillo­scope manual.

Throughout the instructions that follow, it is assumed,
unless otherwise noted, that the Type 2A60 module is in­serted in the Y-axis opening of a Type 560-Series Oscillo-

scope, thereby providing vertical deflection of the oscillo­scope trace.
ing, it will provide horizontal deflection of the trace and
the instructions must be interpreted accordingly. It is further
assumed that there is a time-base or sweep module in the
X-axis opening of the oscilloscope.

If the module is inserted in the X-axis open-

Signal Connections

The signal to be displayed is applied to the INPUT con-

nector on the front panel of the module. For best results,
the signal should be applied through a shielded cable,
with the cable shield connected to the chassis of both

the oscilloscope and the signal source. Leads should be

kept as short as possible.

High-impedance attenuator probes are available for
use with the Type 2A60 module. These probes reduce the
resistive and capacitive loading effect of the module and,

at the same time, attenuate the signal to allow display
of larger signals than would otherwise be possible. These

probes and other accessories are described in the Acces-

sories section of the oscilloscope manual.

Displaying a Signal

To display a signal with the Type 2A60 module, proceed

as follows:

1. Apply the signal, preferably through a shielded cable

or an attenuator probe, to the INPUT connector.

2. Establish a common ground between the oscilloscope
and the signal source. This can be done by connecting
the ground clip on a Tektronix attenuator probe to signal
ground.

3. Adjust the time-base controls to obtain a stable dis­play of the signal.

4. Set the VOLTS/DIV. switch and the POSITION con-

trol so that the signal is placed as desired on the graticule.
In general, if you are interested only in the ac component

of the signal, you should set the AC-DC-GND. switch to
AC; if you are interested in the de level of the signal,.
you should set the AC-DC-GND. switch to DC. An excep­tion to this is in observing low-frequency ac signals. When
the AC-DC-GND. switch is in the AC position, the lower

bandpass limit (3-db point) of the module is about 1.6 cps;

therefore, the best response to signals containing compo-

nents of less than about 2 cps (0.2 cps with a lOX attenu-

ator probe) will be obtained with the AC-DC-GND. switch

in the DC position.

Probe Compensation

If an attenuator probe is used, its capacitance must be

compensated to that of the module for best signal response.
To compensate a Tektronix attenuator probe, proceed as
follows:

l. Display several cycles of the calibrator waveform on

the crt, using the attenuator probe.

2. Adjust the variable capacitor in the body of the
probe to obtain a square leading corner on the positive
half cycles (see Fig. 2).

Gain and DC Balance Adjustments

Any time you move the Type 2A60 module from one
oscilloscope opening to another you must adjust the gain
to compensate for differences in crt deflection sensitivities.
This should also be done from time to time even if the
module has not been moved. In addition, the de balance
of the module should be checked and adjusted, as nec­essary, from time to time.

To properly set the gain of the Type 2A60 module, pro-

ceed as follows:

1. Set the AC-DC-GND. switch to DC, the VOLTS/DIV.

switch to .05, and the VARIABLE control fully clockwise
(to the CALIBRATED position).

2. Display a 0.2-volt Calibrator signal on the crt and
adjust the front-panel GAIN ADJ. control for a deflection
of exactly 4 divisions; or, display a 100-millivolt Calibrator
signal and adjust the GAIN ADJ. control for a deflection
of exactly 2 divisions (the first method is preferred).

1

Type 2A60 Amplifier

~-

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~-

.,_

-

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Under-compensated

Fig. 2. Probe compensation. When the probe is properly compensated, the displayed calibrator waveform will have square leading corners,

as shown in center photograph.

To properly adjust the de balance of the Type 2A60

module, proceed as follows:

1. Set the AC-DC-GND. switch to GND.

2. Display a free-running trace (or spot, if you are not

using a time-base module).

3. Adjust the front-panel DC BAL. adjustment until the

trace does not move as you rotate the VARIABLE control
back and forth throughout its range.

I

:-

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r,--

-

Properly_ compensated

.......

.-

---

..

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1. Set the AC-DC-GND. switch to GND. Make sure the
VARIABLE control is set fully clockwise (to the CALIBRATED
position).

2. Position a free-running trace (or the spot, if you are
not using a time-base module) so that it lies along one
of the horizontal graticule lines. This line will be used as
a zero reference line; its position in any given case will
depend upon the polarity and amplitude of the voltage
to be measured. Do not adjust the POSITION control on
the Type 2A60 module after the reference line has been
established.

,._

-

--

Over-compensated

Voltage Measurements

NOTE

When making measurements, make sure there is

a common ground between the oscilloscope and
the signal source.

To measure the potential difference between two points
on a signal (such as peak-to-peak ac volts), measure the
vertical distance, in graticule divisions, between the two
points whose potential difference is desired, and multiply
by the setting of the VOL TS/DIV. switch and the attenua­tion factor, if any, of the signal probe. Be sure the VARI­ABLE VOL TS/DIV. control is set fully clockwise (to the
CALIBRATED position).

When the VARIABLE VOLTS/DIV. control is not in the
CALIBRATED position, the amplitude of a signal can be
determined by comparing its displayed amplitude with
the displayed amplitude of a known signal, such as the
Calibrator waveform.

To measure the de level at a grven point on a wave-

form, proceed as follows:

3. Set the AC-DC-GND. switch to DC. (If the position

of the trace shifts by more than
see Troubleshooting, "De Reference-Level Shift.")

4. Touch the probe tip to the signal source and adjust

the time-base controls to obtain a stable display.

5. Measure the distance, in graticule divisions, from the
zero reference line established in step 2 to the point on
the waveform at which the de level is desired.

6. Multiply this distance by the setting of the VOLTS/DIV.
switch and the attenuation factor, if any, of the probe.
This is the de level of the point measured.

You can reestablish your zero reference line at any
time merely by placing the AC-DC-GND. switch to GND.;
you do not need to disconnect the probe from the signal
source. If desired, you can establish a reference other
than zero by placing the AC-DC-GND. switch to DC, con-

necting the signal probe to the desired reference voltage,

and positioning the trace as described in step 2 of the

procedure.

1 minor graticule division,

2

®!

Circuit Description

Type 2A60 Amplifier

The Type 2A60 Amplifier consists basically of an Input
Amplifier, a Driver-Cathode Follower Stage, and an Out­put Amplifier. The input Amplifier, V434 and V444, is a
cathode-coupled paraphase amplifier which converts the
single-ended input to a push-pull output. The Driver
Cathode Follower stage, V463, provides isolation between

the Input Amplifier and the Output Amplifier. The Output

Amplifier, V474, drives the crt deflection plates and the

trigger pickoff circuit. Step changes in amplifier sensitivity
are accomplished by changes in input attenuation. Vernier
sensitivity control is accomplished by degeneration in the

cathode circuit of the Input Amplifier.

Input Circuit

The AC-DC-GND. switch, SW400, permits the applied

signal to be either ac or de coupled to the grid of the

Input Amplifier. Placing the switch in the AC position
places C400 between the INPUT connector and the Input

Amplifier, thereby blocking the de component of the signal.
Placing the switch in the GND. position grounds the grid
circuit of the Input Amplifier (it does not ground the applied
signal.)

The signal at the INPUT connector is applied either

"straight through" or through one of three attenuators

... lOX, lO0X, or 1 000X ... to the grid of V434. This pro-

vides overall amplifier sensitivities of 0.05, 0.5, 5, and 50

volts per graticule division of deflection at the crt.

The attenuators are both resistance and capacitance

dividers which provide constant attenuation of the signal
throughout the frequency range of the amplifier. In addi­tion to providing the proper degree of attenuation, the

resistance and capacitance values of the attenuators are
chosen or adjusted to provide a constant input impedance
of 1 megohm paralleled by 47 picofarads, regardless of
the setting of the VOLTS/DIV. switch.

to correspond to the proper value when the VARIABLE

control is set fully clockwise (to the CALIBRATED position).

The DC BAL. adjustment provides the means of setting
the quiescent cathode potential of V444 equal to that of
V434 so that there is no current through R436 and R446
when no signal is applied. When the DC BAL. adjustment
is so set, the de zero reference level on the crt is the same
throughout the range of the VARIABLE control.

The POSITION control changes the quiescent plate volt­ages of V434 and V444, inversely to one another, between
about +37 and +46 volts. This change provides a de
shift in the level of the signal at the output of the Output
Amplifier, thereby changing the position of the trace on
the screen.

C465 and C466 compensate for changes in the input
capacitance of V434 and V444 as the setting of the VARI-

ABLE control is changed.

Output Amplifier

The Output Amplifier has a gain of about 20. D474

and D476 improve the linearity near the ends of its range

by effectively reducing the cathode-coupling resistance

whenever the potential difference between the cathodes
exceeds about 0.2 volt.

Trigger Pickoff Circuit

The Trigger Pickoff circuit samples the signal at the

plate of V474A and applies the sample through V483 to

the trigger input circuit of the time-base module, if one is

used. The output of the Trigger Pickoff circuit has a peak­to-peak amplitude of about 5 volts for each division of
deflection on the screen.

Input Amplifier

The gain of the Input Amplifier is controlled by the set­ting of the GAIN ADJ. adjustment and the VARIABLE con­trol. The GAIN ADJ. adjustment sets the gain of the stage

Troubleshooting

General maintenance and troubleshooting information is

contained in the Type 560-Series Oscilloscope manuals.

In the following discussion it is assumed that you have

read that information and have definitely isolated a trouble
to the Type 2A60 module by the procedures described

there.

No Spot or Trace

If there is no spot or trace on the crt screen, connect a

shorting strap between each pair of points shown in Fig 3,

Hum Balance

The HUM BAL. adjustment provides a means of mini­mizing any line-frequency hum capacitively or inductively
coupled into signal leads from the 6.3-volt ac heater leads.

starting at the right and working toward the left. As you
short between each pair of points, the spot or trace should
appear on the screen. When you reach the point where
the spot or trace no longer appears when the connections

are made, the stage immediately following this point is at
fault.

Insufficient Deflection

If the proper deflection cannot be obtained through

adjustment of the GAIN ADJ. adiustment (see Operating

3

Type 2A60 Amplifier

t

I

I

I

Shorting

Strap

I

I
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I

'

7

+

I

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I

7

I

Shorting

Strap

I

l

I

I

I

I

I

I

+

2·

V463A ·

2

+

I

I

3

I

I I

Shorting

Strap Strap

I

I

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I

8

I

t

V463B

7

+

I

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I

I

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I

Shorting

I

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21

17

'

Fig. 3. Checkpoints for isolating de imbalance in the Type 2A60 module.

Instructions), rotate the POSITION control and see if it has
normal range. It should move a no-signal trace or spot
off the screen in both directions. If it does not, the trouble
is probably in the Driver Cathode Follower or the Output
Amplifier. If the POSITION control does have normal
range, leave it at mid-range and check the deflection at
all positions of the VOL TS/DIV. switch.
present at only one position of the switch, the trouble is
probably in the associated attenuator. If the trouble is
present at all positions of the VOL TS/DIV. switch, the
trouble is probably in the Input Amplifier. Check especially
the common cathode and plate load resistors.

If the trouble is

De Reference-Level Shift

If, when there is no signal applied to the INPUT con-

Calibration

Calibration of the Type 2A60 module is performed with

the module inserted in the Y-axis opening of a Type 560­Series Oscilloscope and a time-base module inserted in
the X-axis opening. Calibration consists of internal trigger
de level adjustment, hum balance adjustment, and attenu­ator frequency compensation. If you are performing a
complete calibration of the module, you should perform
them in the order presented. However, any one of the
adjustments may be performed independently of the others
as long as you perform all of the steps in the procedure.

nector, the position of a free-running trace (or spot) changes
more than 1 minor graticule division as the AC-DC-GND.
switch is moved from GND. to DC or as the VOL TS/DIV.
switch is moved between positions, V434 is probably gassy.
Before replacing it, try swapping it with V444; the tube
may work satisfactorily in that position.

If this condition occurs and cannot be immediately cor­rected, satisfactory measurement of de levels can be accom­plished by establishing the zero reference line with the
AC-DC-GND. switch in the DC position and the signal
probe touched to signal ground. (See Operating Instructions,
"Voltage Measurements.") In this case, you should reestab­lish the zero reference line each time you move the
VOLTS/DIV. switch.

Shield the instrument as much as possible during the hum
balance adjustment and attenuator frequency compensation.
Holding the oscilloscope side panels as nearly in place as
possible while still permitting access to the adjustments
will probably be sufficient. No shielding is necessary dur­ing adjustment of the internal trigger de level.

The locations of the internal adjustments referred to in the
calibration procedures are shown in Fig. 4.

4

®!

Type 2A60 Amplifier

C404C C405C C405B C404B

INt. TRIG.

DC LEVEL BAL.

HUM

Fig. 4. Type 2A60 module calibration adjustments.

Equipment Required

The following equipment is required to calibrate the Type

2A60 Amplifier module:

1. Square-wave generator with a risetime of 0.35 micro-

second or less and a frequency of 1 kc or less. (You may

use the Calibrator output if a square-wave generator is
not available. See "Attenuator Frequency Compensation",

step 2.)

2. 47-pf capacitance standardizer (Tektronix Type CS
47 recommended), or a capacitance meter and an attenu­ator probe.

3. De Voltmeter.

Internal Trigger De Level Adjustment

The need for adjustment of the internal trigger de level
is generally indicated by triggering difficulties with a time­base module set for internal de triggering of the sweep.
properly adjust the internal trigger de level, proceed as

follows:

1. Set the AC-DC-GND. switch to GND. and the VARI-

ABLE control fully clockwise (to the CALIBRATED position).

2. Center the spot or trace on the screen.

3. Set the INT. TRIG. DC LEVEL adjustment so that the

potential at pin 11 of the plug-in connector is exactly zero

with respect to ground.

To

C411

C403C

C403B

Hum Balance Adjustment

The need for hum balance adjustment is indicated by the
presence of excessive 60-cps ripple on the trace. To prop­erly adjust for hum balance in the Type 2A60 module,
proceed as follows:

1. Set the AC-DC-GND. switch to AC, the VOLTS/DIV.

switch to .05, and the VARIABLE control fully clockwise (to
the CALIBRATED position).

2. Display a no-signal trace on the screen (preferably

triggered at line frequency).

3. Shield the INPUT connector (this can be done by

placing a small flat piece of metal, such as a coin, over

the face of the connector), and set the FOCUS and
INTENSITY controls for the sharpest trace possible.

4. Adjust the HUM BAL. adjustment to minimize any

line-frequency ripple on the trace.

Input Capacitance Standardization and Attenu­ator Frequency Compensation

The input capacitance standardization and attenuator

frequency compensation interact, so both are performed

in the same procedure. The need for either or both of these

calibrations is normally indicated by distortion of fast-

rising waveforms on one or more sensitivity ranges of the
module. Standardization of the input capacitance of the

®!

5

Type 2A60 Amplifier

Type 2A60 module requires the use of a 47-picofarad ca­pacitance standardizer. If you do not have a 47-picofarad

standardizer, you can make an attenuator probe into one

by performing the following five steps:

1. With the Type 2A60 module inserted in left-hand open-

ing, turn the oscilloscope on. Set the VOLTS/DIV. switch

to .05 and the AC-DC-GND. switch to DC.

2. Measure the input capacitance at the INPUT con-

nector. With a low-capacitance screwdriver, adjust C41

for a reading of 47 picofarads on the capacitance meter.

3. Disconnect the capacitance meter and connect the

attenuator probe to the INPUT connector.

4. Connect the probe tip to the output of the square­w9ve generator or the oscilloscope Calibrator, and adjust
the oscilloscope controls to display several cycles of the
square-wave signal.

5. Adjust the variable capacitor in the body of the probe
to obtain the best square-wave response.

Your probe is now standardized to perform as a 47-

picofarad capacitance standardizer. You may use it as
such in the following procedure to set the input capacitance
of any module to 47 picofarads. (Do not adjust the probe
further during the procedure.)

To set the input capacitance of the module to 47 pico-

farads and properly compensate the attenuators of the

Type 2A60 module, proceed as follows:

1. Set the AC-DC-GND. switch to DC, the VOLTS/DIV.

switch to .05, and the VARIABLE control fully clockwise (to
the CALIBRATED position).

2. Apply the output of the square-wave generator or

the oscilloscope Calibrator through the 47-pf capacitance

standardizer or the standardizer probe to the INPUT con-

nector. Throughout this procedure the amplitude of the
square wave should be adjusted to produce between 5

and 8 divisions on the crt, if possible. You may use the

VARIABLE control on the Type 2A60 module, if necessary.

l

3. Set the time base controls so that at least one com-

plete cycle of the square wave can be seen on the screen.

4. With a low-capacitance tuning tool, adjust C411 for
the most nearly square leading corner on the positive half
cycle of the displayed waveform.

5. Set the VOLTS/DIV. switch to .5 and adjust C405B and
C405C for the most nearly square leading corner on the

positive half cycle of the displayed waveform.

6. Set the VOL TS/DIV. switch to 5, and adjust C404B
and C404C for the most nearly square leading corner on
the positive half cycle of the displayed waveform.

7. Set the VOL TS/DIV. switch to 50, and adjust C403B
and C403C for the most nearly square leading corner on the
positive half cycle of the displayed waveform.

8. Disconnect the square-wave generator and the capac­itance standardizer.

6

~

z

~

m

z

)>

z

()

m

Inter-City Mfg. Co., Inc.

St. Louis 11, Mo.

MODIFICATIONS

Modification Summary
Strip layout
Modification Kits

MAINTENANCE NOTES

Troubleshooting section of manual (see manual in ENGINEERING section)

PARTS

Electrical parts list

Mechanical parts list

CONTENTS-MAINTENANCE

CALIBRATION

Manual calibration procedure (see manual in ENGINEERING section)

SCHEMATICS

TEK 2A6O RB

2-7-68

HISTORY

The shipping dates are approximate only (±3 months, in most cases). Obtain exact
dates from the Warranty List or from the field office copy of the customer's invoice.

60.beginning sn: 101, August 1960.

2A60 beginning sn: 820, October 1962.

serial

numbers

153

159
160

164
165
207
234
239
253
277
316
336
351

387
409

435
439
575
619
660
687
739
771
799
911

approximate

month shipped

12-60

1-61
2-61
3-61

4-61

5-61

6-61
7-61

8-61

9-61
10-61
11-61
12-61

1-62
2-62
3-62
4-62
5-62
6-62
7-62
8-62
9-62

10-62
11-62
12-62

974
1005
1020
1048
1128
1192
1266
1268
1301
1406
1564
1454

TEK 2A60 IRB

1-63
2-63

3-63
4-63
5-63
6-63
7-63
8-63
9-63

10-63
11-63
12-63

2-24-64

MODIFICATION SUMMARY

a:

®

@ 1965, Tektronix, Inc.

All Rights Reserved.

60/2A60 MODIFICATION SUMMARY

Page 1

Type 60

OUTPUT AMPLIFIER EXPANSION
REDUCED

Effective Prod s/n 301

DESCRIPTION:
To reduce expansion at upper and lower limits of display, the value of the output amplifier

cathode coupling resistor is reduced.
Superseded by M6554 (2A60).

Parts Removed:
R475 82

INPUT AMPLIFIER PARASITIC
OSCILLATION ELIMINATED

Effective Prod s/n 301
DESCRIPTION:

To eliminate parasitic oscillations in the input amplifier, a 4 7

series with the grid of 1:he input amplifier.

n 1/2w 5%

301-0820-00

INFORMATION ONLY M3356-l

Parts Added:
R475

See SQB

Usable in field instruments s/n 101-300

750 l/2w 5%

301-0750-00

n resistor is connected in

M3356-2

Parts Removed:

Parts Required for Field Installation:
See 'Parts Added. '

INSTALLATION INSTRUCTIONS:
Replace bare wire that connects input connector to AC-DC-GROUND switch with a 47

INTERCONNECTING PLUG PIN 24
GROUNDED TO ELIMINATE INTENSITY
MODULATION IN THE 561 AND RM561

Effective Prod s/n 347 Usable in field instruments s/n 101-346

w /exceptions: s/n 111,144,156,165,174,210,277 ,290- 1,301,307 ,313,328,342-5

DESCRIPTION:
To eliminate high voltage intensity modulation in the 561 and RM561, pin 24 on the inter-

connecting socket was grounded. This will bypass R854 (2.2 M) in the 561 and RM561
CRT Cathode circuit when this plug-in is used in the left-hand housing.

Parts Removed:

Parts Added:

R400 47

See SQB

Parts Added:

Q 1/2 w 5%

301-0470-00

n resistor.

M3681

INSTALLATION INSTRUCTIONS:
Ground pin 24 on the interconnecting socket.

4-18-66 60/2A60 MODIFICATION SUMMARY

Page 3

Type 60 (con 'd)

INPUT AMPLIFIER FILAMENT
VOLT AGE SOUR CE CHANGED
TO ELIMINATE VERTICAL
TRACE SHIFT

Effective Prod s/n 432 Usable in field instruments s/n 101-431
FRONT PANEL SYMPTOM: Vertical trace shift with changes in line voltage.
PROBLEM: The filaments of V 434 and V 444 were connected across the 6. 3 V AC winding of

the indicators power transformer via the interconnecting plug.

PRODUCTION CHANGE: The filaments of V434 and V444 were connected in series across

the -12V DC regulated power supply. This was accomplished by changing the cable
harness. Hum balance potentiometer R493, for V434 and V444, was removed
because is was no longer necessary. The chassis was changed to eliminate the
R493 potentiometer hole and silk screen markings.

Parts Removed:

See SQB

M3591

Cable, harness

R493

Parts Added:

INSTALLATION INSTRUCTIONS:

Parts Required:
Installation Procedure:
a) Unsolder the two white-blue-yellow wires from Pin 4 of V434.

b) Unsolder the white-blue-yellow wire from Pin 5 of V463, that connected to Pin 4 of V434.

Cut the three white- blue -yellow wires, unsoldered in Steps a and b, off close to the cable

harness.

c) Unsolder the white-blue-orange wire that connects Pin 4 of V463 to Pin 3 of V434, from

Pin 4 of V 463.

d) Unsolder the two white-blue-orange wires from Pin 3 of V434.

Cut the three white-blue-orange wires ,unsoldered in Steps c and d,,off close to the cable
harness.

e) Unsolder the white-yellow wire from Pin 4 of V 444, and the white-orange wire from Pin 3

of V444, and cut them off close to the cable harness.
Using the wire called out in "Parts Required:" above, wire the filaments of V 434 and V 444
across Pins 5 and 16 of the interconnecting plug as shown in the drawing on following
page.

Pot, 25on
Chassis

Cable, harness
Chassis

*Wire, #22 solid,
*Wire, #22 solid,
*Wire, #22 solid,

See 'Parts Added' with asterisks.

9" black

l

l" black -brown -red

19" black-brown -orange

179-0458-00
311-0194-00
441-0333-00

179-0547-00
441-0391-00

175-0514-00
175-0514-00
175-0514-00

NOTE: The Hum Bal. pot is left in the circuit in parallel with the filaments of V463, V474 and

V 483; however, since it is no longer across the input tube filaments it will have little or

no effect on operation.

continued

Page 4

60/2A60 MODIFICATION SUMMARY 3-11-68

Type 60 (con'd)

-

bk.

M3591

(con 'd)

TRIGGER TAKEOFF SIGNAL

AMPLITUDE INCREASED

Effective Prod s/n 740

DESCRIPTION:
To compensate for a change in 561A CRT sensitivity

the trigger pickoff divider to approximately
for l minor division. (See 'Before' - 'After' drawings on following page.)

** NOTE: This mod is needed only if the type 60 plug-in is to be used in a 561A.

Parts Removed:

R481
R482
R483

Parts Required for Field Installation:
See 'Parts Added.'

Continued.

470k l/2W 5%
100k l/2W 5%
100 k pot

301-0474-00
301-0104-00
311-0207-00

See SQB**

Usable in field instruments s/n 101-739

to 18. 5V /CM, it is necessary to change

3: l, to assure a trigger takeoff signal of 0. 5V

Parts Added:
R480

R481
R482
R483
C481

4. 7 M l/2W 5%
lM l/2W 1%

500 k l/2W
250 k pot

1. 8 pF 500V

1%

M6089

301-0475-00
309-0014-00
309-0003-00
311-0241-00
281-0557-00

E-12-66

60/2A60 MODIFICATION SUMMARY

Page 5

Type 60 (con'd)

INSTALLATION INSTRUCTIONS:
a) Remove the following wires and components:

1) R481, 470 k 1/2W resistor, connected between CSA-24 and CSB-24.

2) R482, 100k l/2W resistor, connected between CSA-25 and CSB-25.

3) Bare wire connecting left-hand terminal of R48 3 (Int Trig DC Level) and CSB -22.

4) Bare wire connecting center terminal of R483 to CSB-25.

5) R483, the Int Trig DC Level potentiometer.
Install the following wires and components:

b)

1) R48~, 250k pot. Connect the bare wire from
CSB-26 and the black-brown-brown wire to the
the right-hand terminal of R483.

2) Bare wire between CSB-25 and CSB-26.

3) Bare wire from CSB-27 to the left-hand
terminal of R483.

4) R480, 4. 7 Meg resistor, from the center
terminal of R483 to CSB-24.

5) R481, 1 Meg 1% resistor, and C481, a 1. 8 pF

ceramic capacitor, between CSA-24 and
CSB-24.

M6089
(con 'd)

R.4Bl

R.480

R483

IN1., TRIG,.

o.c .. \...E\)£.L

l;!,E~Of<.B

+1<'1'1 \J

-- -

R481

470 k.

R4B2.

100 k.

11->T"-TRIG.

O.C. Lc.VE.L

6) R482, 500k 1% resistor, between CSA-25

and CSB-25.

W'!OD

V483

GAU~

6r~4B•

-IOOV

IOOK.

+ 1'2.S \J

R.484

2.2. K..

R4B6

-100\)

C404-

.01

':,~k

>

>4

II

"'3,

Ll-lT0 T~1c;;;.,

'C>.Co L'E'JEL.

AFT€R

R.483

2.SOK

+- ,en \J

()

N\O'D

- IOC>V

-t 1'2.5 \J

R.484

2..2 K..

C484

,C>l

V 483

Page 6 60/2A60 MODIFICATION SUMMARY

8-12-66

Type 60 (con 'd)

FRONT PANEL CHANGED

INFORMATION ONLY

Effective Prod s/n 820

DESCRIPTION:

116011

Change type designation on front panels from

to "2A60." Add a mod slot to the front
panel in addition to the existing s/n slot. A blank mod tag will be used in the mod slot
except for instruments which require mod information. Type designation change and
addition of mod slot will necessitate changing the front panel part numbers.

Change color of front panel knobs, bushings, and switches (buttons) from black to their
equivalent in charcoal gray.

Parts Removed:

Knob, black
SW400 Switch
Front panel

366-0058-00
260-0251-00

333-0622-00

Parts Added:
Knob, charcoal

SW400 Switch
Front panel
Tag, mod insert

M6052

366-0144-00
260-0450-00
333-0725-00
334-0829-00

2-8-66

60/2A60 MODIFICATION SUMMARY

Page 7

Type 2A60

OUTPUT AMPLIFIER COMPRESSION
AND EXPANSION REDUCED

Effective Prod s/n 860

DESCRIPTION:
Varying characteristics of type Tl2G diodes cause instruments to fail compression and

expansion tests. To compensate for variations of the diodes, a shunt resistor is changed to
a selected part with a nominal value of 39

See Ml0303 -1.
Parts Removed: Parts Added:
R475 75

Parts Required for Field Installation:
See 'Parts Added.'

INSTALLATION INSTRUCTIONS:
a) Remove R475, a 75
b) Install the selected R475 on the ceramic strips in parallel with the back-to-back diodes.

R475 is selected for minimum compression and expansion.

n 1/2 w 5%

n 1/2 w resistor, connected between pins 3 and 8 of V474.

301-0750-00

See SQB

Usable in field instruments s/n 101-859

n.

R475 39 n 1/2 w 5%

301-0390-00

M6554

VARIABLE VOL TS/DIV
RANGE INCREASED

Effective Prod s/n 1040

DESCRIPTION:
To insure sufficient adjustment range of the VARIABLE VOLTS/DIV pot when used with high

sensitivity CRT's, change the pot from 7k to 10k.

Parts Removed: Parts Added:
R436

Parts Required for Field Installation:
See 'Parts Added.'

INSTALLATION INSTRUCTIONS:
Replace R436 with a 10 k pot.

7k pot 311-0223-00 R436

See SQB

Usable in field instruments s/n 101-1039

10k pot

311-0076-00

M6836

Page 8

60/2A60 MODIFICATION SUMMARY

11 -28-66

Type 2A60 (con 'd)
SNAPTITE POTENTIOMETERS

REPLACED

Effective Prod s/n 1130
DESCRIPTION:

To facilitate assembly and eliminate potentiometer dust covers, "Snaptite" pots are replaced
by C. T. S. pots.

Parts Removed:

R483 250 k
Cap, pot (dust cover)

UHF CONNECTORS REPLACED
WITH BNC CONNECTORS

Effective Prod s/n 1150

DESCRIPTION:
The UHF connectors are replaced with BNC connectors to match the military and manu-

facturing trend toward the BNC type. The BNC type has a constant 50
lower input capacitance. It also requires less front panel space.

311-241
200-247

INFORMATION ONLY

Parts Added:

R483 250

INFORMATION ONLY

k dbl. adj.

311-373

n impedance and a

M6436

M6860

Parts Removed:
Connector, UHF female

Adapter, probe BNC to UHF

PLUG-IN SPACER RODS CHANGED

Effective Prod s/n 1540

DESCRIPTION:
To facilitate assembly by providing better method of tightening plug-in rods, an 11/32 in.

hexagonal section is added 3/8 in. from one end of the rod.

No part number change.

131-081

103-015

Parts Added:
Connector, BNC female

INFORMATION ONLY

131-126

M7457

2-8-66

60/2A60 MODIFICATION SUMMARY

Page 9

INPUT AMPLIFIER CH A NGES
REDUCE COMPRESSION WITII
VARIABLE VOLTS/DIV IN

COUNTER-CLOCKWISE POSITION

See SQB MJ 0303-1

Effective Prod SN 3044

Usable in field instruments SN J

OJ -3043

w /exceptions: 3041-2

FRONT PANEL SYMITOM: Noticeable compression when the VARIABLE VOLTS/DIV is

ccw and the POSITION control is used to buck out signal DC level of greater thon
2 or 3 divisions.

PROBLEM: The suppressor grids of V434 and V444 were returned to ground and the plotc

voltage was not adequate

to handle input signal swings of more than ±1. SV from

ground (±3 divisions when the VARIABLE VOLTS/DIV was ccw).

PRODUCTION CHANGE: The suppressor grids of V434 and V444 were connected to their

respective cathodes and the plate voltage was increased by about JO volts by changing

R432 from 5.25k l/2W 1%

to 4.225k l/2W 1%. These changes reduce the gain

change to less than 2%. See Mll214.

Parts Removed:

Pc1rts Added:

R432

R432

Res, prec, 5.25k l/2W 1%

Res, prec, M. F., 4. 225 k l/2W 1%

INSTALLATION INSTRUCTIONS:
Ports r~cquired:. See 'Parts Added. '

C':,A

309-00:32-00

323-0663-00

s

In staJla tion Procedure:

Replace R432, a 5. 25 k 1 /2W J % resistor located

between CSA -5 and CSB-5 with a 4. 225 k l /2W l %

resistor. See drawing.

......-----~-------.----,----s;:'

s

Page JO 60/2A60 MODIFICATION SUMMARY

lJ-28-66

VARIABLE VOLTS/DIV RATIO
ASSURED BY CHANGING

INFORMATION ONLY

R474-R476 TO HIGHER VALUE

Effective Prod SN 3044

w /exceptions: 3041-2

FRONT PANEL SYMITOM: None.

PROBLEM: Unable to meet 11. 1 VARIABLE VOLTS/DIV specification when R475 is selected

at the low end of its allowable range (39

O).

PRODUCTION CHANGE: R474 and R476 in the cathode circuit of the output amp V474 were

changed from 4. 7k to 5.1 k resistors. See Mll2l4o

Parts Removed:

Ml0303-2

R474, R476

Res, 4. 7 k 1 W 5%

Parts Added:

R474,R476

Res, 5 o 1 k 1 W 5%

6AU6 AND 12AU6 TUBES REPLACED BY
PREMIUM 8425 AND 8426 TUBES TO

INFORMATION ONLY

REDUCE MICROPHONICS, INTERFACE

AND GRID CURRENT PROBLEMS

Effective Prod SN 3300
FRONT PANELS SYMPTOM: Microphonics, interface, and grid current.

PROBLEM: Usage of 6AU6 and 12AU6 tubes results in high reject rate and length of

selection time because of microphonics, interface, and grid current.

PRODUCTION CHANGE: Type 6AU6 and 12AU6 tubes were replaced by 8425 and 8426

premium tubes.

Parts Removed:

V434, V444

Tube, raw 6AUS

154-0022-00

303-0472-00

303-05)2-00

Ml0548

Parts Added:

1-31-67

V434, V444

Tube,raw 8425/6AU6

60/2A60 MODIFICATION SUMMARY

154-0022-07

Page 11

INPUT AMPLIFIER GAIN ADJUSTED BY
ADDING SELECTED RESISTOR TO ASSURE

11-1 VARIABLE V/CM POTENTIOMETER

RANGE WITH HIGH GAIN TUBES

See SQB

Mll214

Effective Prod SN 3439

w /exceptions 2734

3060

3066
3102
3135
3147

FRONT PANEL SYMPTOM: Range of the variable V /CM potentiometer is less than the

specified 11: 1.

PROBLEM: Ml0303- l reduced the compression in the input amplifier with the variable

V /CM potentiometer in the counter-clockwise position, and increased the gain of
the input amplifier. If R475 is selected at the low end of its range, (R475 is selected
for linearity) a further increase in gain results. If both the input amplifier and the
output amplifier are high gain, the Amp Gain Adj potentiometer (R446) must be set
close to maximum resistance.

Under these conditions, the resistance ratio of R436 to R446 does not allow the
required 11

PRODUCTION CHANGE: A 200 k 1/2 W 5% resistor (R450} was added between the plates

of the input amplifiers V 434 and V 444.

Parts Added:

to 1 ratio of the variable V /CM potentiometer (R436).

3170
3183-4
3193
3195

3241

3244

3246-7
3258
3268
3276
3289
3303

Usable in field instruments SN 101-3438

3306 3377 3426
3323 3390
3325 3393-3400
3332 3406
3352 3411
3357 3414

R450

INSTALLATION INSTRUCTIONS:
Parts Required: See 'Parts Added'.

Installation Procedure:
Install R450, a selected resistor with a nominal value of 200 k, between the plate (piiv'J

of V434 and the plate (ping) of V444. (CSA-11 to CSB-12)

Resistor, comp, 200k 1/2W 5% 301-0204-00

s

JT:fb

Page 12

60/2A60 MODIFICATION SUMMARY 11-28-66

PARALLEL REAR CONNECTOR

For the following Tektronix Plug-in Units:

Type 60SN 101- 819 Type 75SN 101-1119
Type 2A60 SN 820- up Type 3A75 SN 1120- up
Type 67 SN 101 -5000 Type 3B1 SN 101 - up
Type 2B67 SN 5001 - up Type 3B3 SN 101 - up

Type 3B4 SN 101- up

DESCRIPTION

This modification provides one coaxial line to a BNC
connector on the rear panel of the instrument, para! ­leling the front panel input connector or binding post.
The plug-in/indicator interface is fitted with a pairof

mating holders for miniature coaxial connectors,
which permit withdrawal of the plug-in without un ­soldering the cable.

To complete the modification, you must install one of
the following Modification Kits in an RM561, RM561A, or

RM564 indicator: 040-0409-00 provides one coaxial
line for either right or left plug-in compartment (but
not both); 040-0410-00 provides two coaxial lines for
either right or left plug-in compartment; 040 -0411-0 0
provides four coaxial lines for either right or left
plug-in compartment.

®

Additional kits are available to install two or four
coaxial lines (depending upon plug-in type) in 2- and

3-series plug-ins.* The connector holders are the

same whether they hold one, two, or four connectors,

so the plug-ins having various numbers of connectors

are interchangeable. However, to insure electrical
continuity from front to rear panel, the plug-in and
indicator coaxial lines must 'match'.

NOTE: The Types 67, 2B67, 3B1, 3B3, and 3B4 have
two front panel inputs, either of which may be con­nected to the rear via 040-0406-00. The remaining
input may later be connected to the rear by installing

a second 040-0406-00.

*040-0407-00 provides two coaxial lines in Types 2A61,

63, 2A63, 67, 2B67, 3Al, 3A6, 72, 3A72, 3B1, 3B3,
and 3B4. 040-0408-00 provides four coax ial lines in
Types 3A3 and 3A74.

See LIMITATIONS on page 2.

Publication:
Instructions for 040-0406-00
June 1966

Supersedes May 1966

@ 1966, Tektronix, Inc.

All Rights Reserved.

040-0406-00 Page 1 of 19

LIMITATIONS:

1. Compatibility
Modified plug-ins will not fit in the following indicators: Types 560, 561, 561A, 564, 567,

and RM567. In the Types 567 and RM567, the digital readout connector blocks insertion.

In the others, the solid back wall of the plug-in compartment prevents sufficient insertion
of the plug-in to 'mate' the 24-pin connectors on the plug-in and indicator.

Modified plug-ins may be used in the Types RM561, RM561A, RM564, 565, RM565, and
129, although no kits are available to equip the 565, RM565, or 129 with rear input connec-

tors. Also, there could be noise problems with one of the more sensitive plug-in units
having an open input connector facing into an indicator power supply.

2. Changes in Electrical Characteristics
The system is basically incompatible with conventional XlO or XlO0 high-impedance probes.

This is because the input capacitance of the plug-in is raised to approximately lO0pF, plus
the capacitance of the circuitry attached to the rear connector.

Optimum transient response for 10MHz instruments may be preserved by terminating at
the front-panel connector for signals applied to the rear-panel connector. There will be

some degradation of transient response in 10 MHz instruments for signals ai::plied to the

front panel input or terminated at the rear panel. For lower bandwidth instruments, the

only noticeable effect will be that of the increased cable capacitance on signals from sources
greater than 50

n.

Page 2 of 19

040 ... 0406-00

PARTS LIST

Quantity

Part Number

(1 ea)

lea

131-0409-00
1 ea (162-0531-00)
1 ea (17 5-0068 -00)

2 ea 210-0457-00

2 ea 211-0507-00
2 ea

211-0512-00
1 ea 334-1070-00
3 ea 343-0088-00
1 ea 348-0003-00
1 ea 352-0094-00

2 ea

385-0113-00
1 ea 385-0138-01

Description

Assembly, coax-connector, consisting of:

Connector, coax, Cannon DM53743-5001
Tubing, plastic, #12 black (heat-shrinkable) 3/ 4 in.
Cable, coax, RG-174/U gray 21 in.

Nut, Keps, 6-32 x 5/16
Screw, 6-32 x 5/16 PHS, Phillips
Screw, 6-32 x 1/2 FHS 100°, Phillips
Plate, information, 1/4 x 1
Clamp, cable, size C
Grommet, rubber, 5/16in.
Holder, coax connector, Delrin :.-

ili

Rod, nylon, 5/16 x 1-1/8, tap 6-32 w/2 #27 holes
Rod, Delrin, 5/16 x 1-9/16, tap 6-32 w/4 #31 holes

*Du Pont registered trademark.

040-0406-00

Page 3 of 19

INSTRUCTIONS
A. TO MODIFY TYPE 60 OR 2A60
( ) 1. Mount the coax connector holder (from kit) on the rear plate of the plug-in, using the

6-32 flathead screws and Keps nuts from the kit (see Fig. 1).

( ) 2. Install the coax -connector assembly (from kit) in position

in Fig.

1.

J -1 on the holder, as shown

() 3. Drill two 1/Sin. holes as shown in Fig. 2 (on following page).
( ) 4. Dress the coax along the chassis to the INPUT connector (see Fig. 2). Solder the

center conductor to the connector and the shield to the ground lug.

( ) Secure the cable to the chassis by pressing cable clamps (from kit) into the holes

drilled in step A -3.

THIS COMPLETES THE INSTALLATION FOR THE TYPE 60 OR 2A60

( ) Remove the tape backing from the information plate (from kit) and attach the plate to the

front panel just beneath the words "TYPE 60 (2A60) AMPLIFIER".

( ) Fasten the insert page in your Instruction Manual.

U'l:i,e· IN Pl:.ACE OF=

MO~TING- NUT I~

PRE~eMT IN YOUR

INSTi:::lUMENT

Page 4 of 19

Fig. l , 60 /2A60

040-0406 .. 00

INSTRUCTIONS (cont)

~~

Ill

Q.

~

d

J

0

2~

4 ia

B~

Ill z:

dJ -

J I

0$

Iw

' fl

00 0.

'

- I-

Jl

J:)

-o

gi

a

0 -:1'...0

14>:,

~l

0

'°

<G

N

"-

0

'°

N

bO

•,-\

µ.,

040-0406-00

Page 5 of 19

INSTRUCTIONS (c::ont)

B. TO MODIFY TYPE 75 OR 3A75
( ) 1. Locate the center chassis-mounting screw in the rear plate of the plug-in.
( ) Loosen this screw, but do not remove it.
( ) 2. Strike the screw head lightly with a hammer to loosen the Pem nut from the chassis.
( ) Remove the screw and Pem nut.
( ) 3. With a 5/32 (#23) drill, drill a hole in the chassis in line with the hole in the rear

plate immediately below the one from which the screw was removed.
CAUTION: Move the cable harness first to avoid damage.

( ) 4. Mount the coax connector holder (from kit) on the rear plate, using the 6-32 flathead

screws and Keps nuts from the kit (see Fig. 3).

( ) 5. Install the coax-connector assembly (from kit) in position

in Fig. 3.

U~E IN PLACE Ot='
MOUNTING- NUT

PRE'&E:NT IN YOU~

INSTRUMENT

u::

J -1 on the holder, as shown

Dl=<ILL Ci-lA"=:,SIS

I-IEl<E

Fig. 3, 75/3A75

040-0406-00

Page 7 of 19

INSTRUCTIONS (cont)

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Page 8 of 19

040-0406-00

INSTRUCTIONS (cont)

B. TO MODIFY TYPE 75 OR 3A75 (cont)

( ) 6. Drill three 1/8 in. holes as shown in Fig. 4.
( ) 7. Dress the coax along the chassis to the INPUT connector (see Fig. 4). Solder the

center conductor to the connector and the shield to the ground lug.

( ) Secure the cable to the chassis by pressing cable clamps (from kit) into the holes

drilled in step B -6.

THIS COMPLETES THE INSTALLATION FOR THE TYPE 75 OR 3A75.

( ) Remove the tape backing from the information plate (from kit) and attach the plate to

the front panel just beneath the words "TYPE 75 (3A75) AMPLIFIER".

( ) Fasten the insert page in your Instruction Manual.

040-0406-00

Page 9 of 19

INSTRU

TIONS

C

(cont)

~o

Page 10 of 19

Fig. 5

040-0406-00

INSTRUCTIONS ( cont)
C. TO INSTALL COAX CONNECTOR HOLDER (TYPES 67, 2B67, 3B1, 3B3, and 3B4)

( ) 1. Mount the coax connector holder (from kit) on the rear plate of the plug-in, using the

6-32 flathead screws and Keps nuts from the kit (see Fig. 5).

NOTE: On some instruments the mounting hole must be drilled through the chassis

lip, in line with the hole in the rear plate.

( ) 2. Install the coax -connector assembly (from kit) in position

(see Fig. 5), referring to the table below for the proper position.

Plug-in Type Front Panel Connector Position

67 /2B67 EXT INPUT J-1
67 /2B67 EXT TRIG J -2

3B1 Delayed EXT TRIG
3Bl Normal EXT TRIG J-2
3B3 Delayed EXT TRIG
3B3 Normal EXT TRIG J -2
3B4 EXT HORIZ IN J -1
3B4 EXT TRIG IN J-2

J -1 or J -2 on the holder

J -1
J -1

040-0406-00

Page 11 of 19

INSTRUCTIONS (cont)

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Page 12 of 19

040-0406-00

INSTRUCTIONS (cont)

D. TO MODIFY TYPE 67 OR 2B67

IMPORTANT: Select the proper step below, plus the portion of Fig. 6 which

applies, to connect either the EXT INPUT or the EXT TRIG
binding post to the rear panel.

1. EXT INPUT (see top portion of Fig. 6):

( ) a) Install the 5/16in. grommet (from kit) in the cutout in the TIME/DIV switch

bracket.
() b) Drill a l/8in. hole in the chassis, just above V24.
( ) c) Dress the coax cable (from
( ) d) Secure the cable to the chassis by pressing a snap-in cable clamp (from kit)

into the hole drilled in step D -1-b .

( ) e) Solder the coax center conductor to the EXT INPUT binding post and the shield

to the ground post.

2. EXT TRIG (see bottom portion of Fig. 6):
( ) a) Drill a 1/8 in. hole in the chassis, midway between V45 and Vl35.
( ) b) Drill out the 'bottom' hole in the support post, near V24, to 1/8 in.
( ) c) Dress the coax cable (from J-2) through the post hole drilled out in step D-2-b.

( ) d) Secure the cable to the chassis by pressing a snap-in cable clamp (from kit) into

the hole drilled in step D-2-a.

( ) e) Solder the coax center conductor to the EXT TRIG binding post and the shield

to the ground post.

THIS COMPLETES THE INSTALLATION FOR THE TYPE 67 OR 2B67.

( ) Fasten the insert page in your Instruction Manual.

J -1) through the grommet installed in step D-1-a.

040-0406 ... Q0

Page 13 of 19

INSTRUCTIONS (cont)

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Page 14 of 19

040-0406-00

1

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WI-

INSTR UC TIO NS ( cont)

E. TO MODIFY TYPE 3Bl

IMPORTANT: Select the proper steps below, plus the portion of Fig. 7 which

applies, to connect either the Delayed EXT TRIG or the Normal
EXT TRIG binding post to the rear panel.

1. Delayed or Normal EXT TRIG:

( ) a) Unsolder, from the TIME/DIV switch, the coax cable which passes through the

support post near Q23

( ) b) Replace the support post with a 4-hole post (rod) from the kit.

( ) c) Dress the coax cable (unsoldered in step E-1-a) through the 'bottom' hole in the

new post and resolder to the TIME/DIV switch.

( ) d) Drill a 5/32in. hole at the rear of the chassis, as shown in Fig. 7.

CAUTION: Look out for the wiring cable on the other side of the chassis.

( ) e) In this hole, mount a 2-hole support post (rod) from the kit. Use a 6-32 x 5/16

PHS screw from the kit.

2. Delayed EXT TRIG:

( ) a) Dress the coax cable (from

the 4-hole posts.

( ) b) Solder the coax center conductor to the Delayed SOURCE switch (lug connected

to EXT TRIG binding post). Solder the shield to the middle grounded lug of the

switch.

3. Normal EXT TRIG:

( ) a) Dress the coax cable (from

and the second hole from the 'top'

( ) b) Solder the coax center conductor to the Normal SOURCE switch (lug connected to

EXT TRIG binding post). Solder the shield

THIS COMPLETES THE INSTALLATION FOR THE TYPE 3B1.

( ) Fasten the insert page in your Instruction Manual.

J -1) through the 'top' holes in both the 2-hole and

J -2) through the 'bottom' hole in the 2-hole post

in the 4-hole post.

to the grounded lug of the switch.

040-0406..,00

Page 15 of 19

INSTRUCTIONS (cont)

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Page 16 of 19

11

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040-0406-00

INSTRUCTIONS (cont)

F. TO MODIFY TYPE 3B3:

IMPORTANT: Select the proper steps below, plus the portion of Fig. 8 which

applies, to connect either the Delayed EXT TRIG or the Normal
EXT TRIG binding post to the rear panel.

1. Delayed or Normal EXT TRIG:

( ) a) Unsolder, from the TIME/DIV switch, the coax cable which passes through the

support post near Q23.
( ) b) Replace the support post with a 4-hole post (rod) from the kit.
( ) c) Dress the coax cable (unsoldered in step F-1-a) through the 'bottom' hole in the

new post and resolder to the TilvE /DIV switch.

( ) d) Drill a 5-32in. hole at the rear of the chassis, as shown in Fig. 8.

CAUTION: Look out for the wiring cable on the other side of the chassis.

( ) e) In this hole, mount a 2-hole support post (rod) from the kit. Use a 6-32 x 5/16

PHS screw from the kit.

2. Delayed EXT TRIG:

( ) a) Dress the coax cable (from J-1) through the 'top' holes in both the 2-hole and

the 4-hole posts.

( ) b) Solder the coax center conductor to the Delayed EXT TRIG binding post and

the shield to the grounded SOURCE switch terminal.

3. Normal EXT TRIG:

( ) a) Dress the coax cable (from J-2) through the 'bottom' hole in the 2-hole post and

the second hole from the 'top' in the 4-hole post.

( ) b) Solder the coax center conductor to the Normal EXT TRIG binding post and the

shield to the ground post.

THIS COMPLETES THE INSTALLATION FOR THE TYPE 3B3.

( ) Fasten the insert page in your Instruction Manual.

040-0406-00

Page 17 of 19

INSTRUCTIONS (cont)

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Page 18 of 19

040-0406-00

INSTRUCTIONS (cont)
G, TO MODIFY TYPE 3B4:

IMPORTANT: Select the proper steps below, plus the portion of Fig. 9 which

applies, to connect either the EXT HORIZ IN or EXT TRIG IN
connector to the rear panel.

1. EXT HORIZ IN or EXT TRIG IN:

( ) a) Drill a 5 /32 in. hole in the chassis, slightly above and to the rear of V24.

CAUTION: Look out for the wiring cable on the other side of the chassis.

( ) b) Drill a 5/32in. hole in the chassis, between Vl61 and Vl73.

( ) c) In each of the holes drilled above, mount a 2-hole support post (rod) from the

kit. Use 6-32 x 5/16 PHS screws from the kit.

2. EXT HORIZ IN:
( ) a) Dress the coax cable (from
( ) b) Solder the coax center conductor to the EXT HORIZ IN connector and the shield

to the ground lug.

3. EXT TRIG IN:
( ) a) Dress the coax cable (from
( ) b) Solder the coax center conductor

the ground lug.

THIS COl\.1PLETES THE INSTALLATION FOR THE TYPE 3B4.
( ) Fasten the insert page in your Instruction Manual.

CH:cet

J -1) through the 'top' holes in the support posts.

J -2) through the 'bottom' holes in the support posts.

to the EXT TRIG IN connector and the shield to

040-0406-00

Page 19 of 19

PARALLEL REAR CONNECTOR

Types 60, 2A60, 67, 2B67, 75, 3A75, 3Bl, 3B3, and 3B4 -- All serial numbers

Installed in Type SN Date

GENERAL INFORMATION

This modification provides one coaxial line to a ENC connector on the rear panel of the instru -

ment, paralleling the front panel input connector or binding post. The plug-in/indicator inter ­face is fitted with a pair of mating holders for miniature coaxial connectors, which permit
withdrawal

To complete the modification, you must install oc1e of the following Modification Kits in an

RM561, RM561A, or RM564 indicator: 040-0409-00 provides one coaxial line for either right
or left plug-in compartment (but not both); 040-0410-00 provides two coaxial lines for either

right or left plug-in compartment; 040-0411-00 provides fo11r coaxial lines for either right or
left plug-in compartment.

Additional kits are available to install two or four coaxial lines (depending upon plug-in type)
in 2- and 3-series plug-ins. The connector holders are the same whether they hold one, two,

or four connectors, so the plug-ins having various numbers of connectors are interchangeable.

However, to insure electrical continuity from front to rear panel, the plug-in and indicator
coaxial lines must 'match',

The following chart shows the proper connector on the indicator rear panel for each front panel
input, whether the plug-in is used in the left (vertical) or right (horizontal) compartment.

oi the plug-in without unsoldering the cable, ·

--- --- ---

Using Left

Instrument

60, 2A60
75, 3A75
67, 2B67 ·

3Bl
3B3
3B4 EXT HORIZ IN

NOTE: The Types 67, 2B67, 3Bl, 3B3, and 3B4 have two front panel inputs, either of which

may be connected to the rear via 040-0406-00. The remaining input may later be
connected to the rear by installing a second 040-0406-00.

Front Panel Input Compartment Compartment

INPUT J-1

INPUT J-1
EXT INPUT
EXT TRIG

Delayed EXT TRIG
Normal EXT TRIG
Delayed EXT TRIG
Normal EXT TRIG

EXT TRIG IN

J-1

J-2 J-6
J-1 J-5
J-2
J-1
J-2
J-1
J-2

Using Right

J-5
J -5
J-5

J-6
J-5

J-6
J-5
J-6

040-0406-00

Page l of 2

LIMITATIONS:

1 . Compatibility

Modified plug-ins will not fit in the following indicators: Types 560, 561, 561A, 564, 567,

and RM567. In the Types 567 and RM567, the digital readout connector blocks insertion.
In the others, the solid back wall of the plug-in compartment prevents sufficient insertion
of the plug-in to 'mate' the 24-pin connectors on the plug-in and indicator.

Modified plug-ins may be used in the Types RM561, RM561A, RM564, 565, RM565, and

129, although no kits are available to equip the 565, RM565, or 129 with rear input connec-

tors. Also, there could be noise problems with one of the more sensitive plug-in units

having an open input connector facing into an indicator power supply.

2. Changes in Electrical Characteristics
The system is basically incompatible with conventional XlO or Xl00 high-impedance probes.

This is because the input capacitance of the plug-in is raised to approximately l00pF, plus
the capacitance of the circuitry attached to the rear connector.

Optimum transient response for 10MHz instruments may be preserved by terminating at
the front-panel connector for signals applied to the rear-panel connector. There will be

some degradation of transient response in 10 MHz instruments for signals applied to the
front panel input or terminated at the rear panel. For lower bandwidth instruments, the
only noticeable effect will be that of the increased cable capacitance on signals from sources

greater than 50

n.

MECHANICAL PARTS LIST

Clamp, cable, size C
Connector, coax, Cannon DM53743-5001
Grommet, rubber, 5 /16 in.
Holder, coax connector, Delrin
Nut, Keps, 6-32 x 5/16

Plate, information, 1/4 x 1

Rod, Delrin, 5/16 x 1-9/16 w/4 #31 holes
Rod, nylon, 5/16 x 1-1/8 w/2 #27 holes
Screw, 6-32 x 5/16 PHS, Phillips

Screw, 6-32 x 1/2 FHS 100°, Phillips

Part Number

343-0088-00
131-0409-00
348-0003-00
352-0094-00
210-0457-00
334-1070-00
385-0138-01
385-0113-00
211-0507-00
211-0512-00

Page 2 of 2

040-0406-00

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VALUES AND SERIAL NUMBER
RANGES Of PARTS MARKED
WITH &LUE OUTLINE.

C405C
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1245 1
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INPUT SIGNAL . NONE

ll'OSITION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MIDRANGE

RESISTANCE READINGS WERE TAKEN WITH MODULE

REMOVED FROM OSCILLOSCOPE.

A 2A60

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MECHANICAL PARTS UST

CONTENTS

Front View
Right Si.de View
Left Side View
Rear View

PUBI.ICA ilON NO.

October 1964

061-838

(Revised)

Page 2
Page
Page 5
Page 6

4

2A60 Mechanical

FRONT

DC SAL

INPUT

TY 2A60

AMPLIFIER

CALIBRATED

DC AMPLIFIER

BANDWIDTH DC-! MC

RJSETIME "'0.35 ;<SEC

POSITION

GAIN ADJ.

2

OREGON, U.S.A.

2A60 Mechanical

FRONT

REF.

NO.

PART NO. EFF.

366-0044-00

1

366-0113-00 820
210-0413-00
210-0840-00
210-0013-00

366-0058-00 101

2

366-0144-00
366-0038-00

358-0010-00

3

210-0013-00
210-0494-00

334-0679-00

4

366-0109-00

5

334-0829-00

6

129-0035-00

7

... - - - ... -

355-0507-00
200-0103-00
210-0011-00
210-0455-00

SH.IAL/MODIEI. NO.

DISC:.

101

819 1

819

820

820 1

Q

T

Y.

DESCRIPTION

KNOB, small black, Position
1 KNOB, small charcoal, Position
1 NUT, hex., 3/8-32 x 1/2

WASHER, 0.390 ID x 9/16 OD

1
1 LOCKWASHER, internal, 3/8 x 11/16

1

KNOB,
1 KNOB, large
1 KNOB, small

BUSHING, 3/8-32 x 9/16

2

LOCKWASHER, internal, 3/8 x 11/16

2

NUT, hex., 3/8-32 x 1/2 x 11/16

2
1 TAG,

KNOB, plug-in securing

1

TAG, metal blank mod.

POST, binding, assembly

1

-

1
1
1
1 NUT, hex., 1/4-28 x

large black, Volts/Div

charcoal, Volts/Div
red, Variable

metal

serial no. insert

insert

Consisting Of:
STEM, adapter
CAP

LOCKWASHER, internal, 1/4

3/8

131-0081-00

8

131-0126-00
333-0622-00

9

333-0725- 00

006-0997-00

387-0577-00

101

1149

1 CONNECTOR,

1150 1 CONNECTOR,
101 819

820

1

PANEL,
1 PANEL, front (type 2A60)
1 COVER,
1 PLATE,

coaxial, 1 contact, UHF

coaxial, 1

front (type 60)

panel, plastic
front subpanel

contact, BNC

B

2A60 MECHANICAL

3

RIGHT SIDE

0 ©

REF.

NO.

PART NO. EFI'.

1

384-0566-00 101

SERIAL/MODEi. NO.

384-0615-00 1540
212-0043-00 101

179-0458-00 101

2

179-0547-00 432

136-0008-00

3

213-0044-00

4 124-0095-00

361-0009-00

5 136-0015-00

213-0044-00
6 200-0247-00 101
7 210-0201-00

213-0044-00
8 441-0333-00 101

441-0391-00 432

211-0504-00

211-0538-00
9 200-0247-00 101

210-0840-00 Xll30

210-0413-00 X1130

G)

DISC.

1539

CD

Q

T

Y.

4 ROD, frame, spacing
4 ROD, frame, spacing

mounting hardware for each: (not included w/rod)
558X
431

1 SCREW, 8-32 x 1/2 inch, FHS
1 CABLE, harness, chassis
1 CABLE, harness, chassis
3 SOCKET, STM7G

Mounting Hardware For Each: (not included)

2 SCREW, thread cutting, 5-32 x 3/16 inch PHS
6 STRIP, ceramic, 7/16 x 9 notches

12 SPACER, nylon, molded

2 SOCKET, STM9G

Mounting Hardware For Each: (not included)

2 SCREW, thread cutting, 5-32 x 3/16 inch, PHS

2439X 1 CAP, pot, poly.

1 LUG. solder, SE 4
1 SCREW, thread cutting, 5-32 x 3/16 inch, PHS

431 1 CHASSIS

1 CHASSIS

Mounting Hardware: (not included)
3 SCREW, 6-32 x 1/4 inch, BHS
2 SCREW, 6-32 x 5/16 inch, 100°

1129X 1 CAP, pot

1 POT

mounting hardware: (not included w/pot)

1

WASHER, flat, 0.390 ID x 9/16 inch OD

1

NUT, hex., 3/8-32 x 1/2 inch

DESCRIPTION

4

2A60 MECHANICAL

C

LEFT SIDE

RH.

NO. PART 1\10.

1 348-00Li
2 200-247

3 262-373

4 406-615

211-007
210-004

210-406
5 214-153
6 384-231

376-014
7 376-010
8 406-101

210-413

210-012

210-413

210-012

9 210-406

10 214-052

210-406

210-004

11 214-153

SERIAi. NO.

1-----------IT

DISC.

Q

Y.

GROMMET, rubber, 3/8

4

CAP, pot, poly.

1

SWITCH, wired, Volts/Div,

1

Includes:

1

BRACKET, input, attenuator

Mounting Hardware:

4

4

4

6

1

l

1

l

SCREW,
LOCKWASHER, int. #4
NUT, hex, 4-40 x 3/16

FASTENER, snap, double pronged

ROD, extension, shaft

COUPLING, pot, wire
COUPLING, cap, nylon

BRACKET, nylon, pot

4-40 x 3/16 BHS

Mounting Hardware:

2

1

NUT, hex,
LOCKWASHER, int, 3/8 x 1/2

3/8-32 x 1/2

Mounting Hardware For Switch: (not included)

1
1

2

1

NUT, hex, 3/8-32 x

LOCKWASHER, int. 3/8 x 1/2

NUT, hex, 4-40 x 3/16 (slide switch mounting)

FASTENER, pawl right, w/stop

1/2

Mounting Hardware: (not included)

2
2

l

NUT, hex, 4-40 x 3/16

LOCKWASHER, int.

#4

FASTENER, snap, double pronged

2A60 Mechanical

5

REAR

---0

REI!'.

PART NO. !:Fil'. DISC.

r-10.

131-149

1

211-008
210-004

210-406

387-581

2

212-044

351-037

3

211-013
210-004
210-406

!ilERiAI.

NO.

Q

T

Y.

CONNECTOR, chassis mto,

l

Mounting Hardware:

2

2
2

l

SCREW,

LOCKWASHER, int. #4

NUT, hex, 4-40 x 16

PLll.TE, rear

L;=40 x 1/ {,, BHS

Mounting Hardware: (not included)

4

l

SCREW, 8-32 x 1/2 RHS, phillips slot

GUIDE, plug-in

Mounting Hardware: (not included)

l
l

l

SCREW, 4-40 x RHS

LOCKWASHER,

NUT, hex, 4-40 x 16

24 contact, male

included)

int. #4

6

2A60 Mechcmical

ELECTRICAL PARTS

Values are fixed unless marked Variable.

Tektronix

Ckt. No.

Part No.

Description

Capacitors

LIST

S/N Range

Tolerance +-20%

C400
C403B
C403C
C403E
C404B

C404C
C404E
C405B

C405C

C405E

C411
C425
C430
C432
C465

C466
C475
C481
C484
C495
C497

unless otherwise indicated

285-0587-00
281-0010-00
281-0010-00
283-0564-00
281-0010-00

281-0010-00
283-0527-00
281-0010-00
281-0010-00
281-0530-00

281-0010-00
283-0002-00
283-0002-00
283-0003-00
281-0534-00

281-0534-00
283-0041-00
281-0557-00
283-0002-00
283-0008-00
283-0008-00

0.1 µF

4.5-25 pF

4.5-25 pF

0.01 µF

4.5-25 pF

4.5-25 pF

0.001 µF

4.5-25 pF

4.5-25 pF
100 pF

4.5-25 pF

0.01 µF

0.01 µF

0.01 µF

3.3 pF

3.3 pF

0.0033 µF

1.8 pF

0.01 µF

0.1 µF

0.1 µF

PTM

Cer
Cer

Mica

Cer

Cer

Mica

Cer Var
Cer Var
Cer

Cer
Cer
Cer
Cer

Cer

Cer
Cer
Cer
Cer
Cer
Cer

Var

Var

Var

Var

Var

600V

300 V

SOOY

SOOY

SOOY
500 V
lSOV

SOOY

SOOY
SOOY
SOOY

SOOY

10%

5%

10%

+0.25 pF

+-0.25 pF

5%

X740-up

Diodes

D474
D476

L443
LR433

Resistors are fixed, composition, +- 10% unless otherwise indicated.

R400
R403C
R403E
R404C
R404E

@

152-0008-00
152-0008-00

*l 08-0214-00

*108-0028-00

302-0470-00 47n
309-0148-00
309-0115-00 l kn
309-0145-00 990 kn
309-0135-00 10.l kn

Germanium
Germanium

Inductors

400 µH
180 µH (wound on a 4.7 kn, 1 W resistor)

Resistors

½W

l Mn

½W
½W

½W

½W

Pree
Pree
Pree
Pree

X301-up
1%
1%
1%
1%

1

Electrical Parts list-Type 2A60

Ckt. No.

R405C
R405E
R411
R421
R423

R425
R430
R431
R432
R434

R436
R437
R441
R444
R446

R447
R451
R453
R455
R460

Tektronix

Part No.

309-0142-00 900 kn
309-0138-00 111 kn
309-0148-00 1 Mn
311-0184-00 1 Mn
302-0225-00 2.2Mn

302-0103-00 10 kn
302-0104-00 l00kn
302-0101-00 1000
309-0032-00
309-0192-00

Use 311-0076-00

31 0-0066-00
302-0101-00
309-0192-00
311-0220-00

310-0066-00
301-0434-00
311-0226-00
301-0434-00
302-0101-00

5.25 kn

11.48 kn

l0kn
18 kn
1000

11.48 kn
1 kn

18 kn
430 kn
2 x

soo kn

430kn
lO0n

Resistors

Description

½W
½W
½W

½W

½W
½W
½W
½W
½W

lW
½W
½W

1W
½W

½W
½W

(Cont)

Var

Var

Var

Var

Pree 1%
Pree
Pree

Pree
Pree

Pree
Pree

Pree

1%
1%

1%
1%

1%
1%

1%

5%

5%

S/N Range

R461
R465
R466
R467

R470

R471
R473
R474

R474
R475
R475

R476

R476

R477

R480

R481

R481

R482

R482

R483

R483
R484

R485

R486

R493

R495

R497

302-0101-00
301-0223-00
301-0152-00
301-0223-00
302-0101-00

302-0101-00
308-0054-00
303-0472-00
305-0512-00
301-0820-00

Use 301-0390-00

303-0472-00
305-0512-00
308-0054-00
301-0475-00
301-047 4-00
309-0014-00

301-0104-00
309-0003-00
311-0207-00

Use 311-0373-00

302-0222-00

302-0101-00
302-0333-00
311-0194-00
302-0270-00
302-0270-00

100n
22 kn

1.5 kn
22 kn
1000

1000

10 kn

4.7 kn 1W

5.1 k 2W
82n
39n

4.7 kn 1W

5.1 k 2W
10 kn SW

4.7 Mn
470 kn

1Mn

100 kn
500 kn
100 kn
250 kn

2.2 kn

1000
33 kn

Q

250
270
270

½W
½W
½W
½W
½W

½W

SW

½W
½W

½W
½W
½W

½W
½W

½W

½W
½W

½W
½W

Var

Var

Var

5%
5%
5%

WW 5%

5%
5%
5%
5%

5%
5%

WW 5%

5%

Pree

Pree

5%

1%

5%
1%

101-3039

3040-up

101-300

301-up

101-3039

3040-up
X740-up

101-739

740-up

101-739

740-up

101-739

740-up

101-431X

2

®

TYPE 2A60

ADD:

INSTRUCTION MANUAL

(Parts List Addendum)

PARTS LIST CORRECTION

* R450

301-02o4-oo

SCHEMATIC CORRECTION

V434 5 +125V

R4SO

2001(

200 k

1/2 ',I

+300V

+125V

2.

PARTIAL AMPLIFIE.R DIAGRAM

* Selected part - nominal value: installed.

*

Mll,214/866

TEK 2A60 RB 1-16-67

2

ELECTRICAL

Values are fixed unless marked Variable.

PARTS

LIST

Ckt. No.

Tolerance +20%

C400
C403B
C403C
C403E
C404B

C404C
C404E
C405B
C405C
C405E

C411
C425
C430
C432

C465

C466
C475
C481
C484
C495
C497

Tektronix

Part No.

unless otherwise indicated

285-0587-00
281-0010-00
281-0010-00
283-0564-00
281-0010-00

281-0010-00
283-0527-00
281-0010-00
281-0010-00
281-0530-00

281-0010-00
283-0002-00
283-0002-00
283-0003-00
281-0534-00

281-0534-00
283-0041-00
281-0557-00
283-0002-00
283-0008-00
283-0008-00

0.1 p,F

4.5-25 pF

4.5-25 pF

0.01 µ,F

4.5-25 pF

4.5-25 pF

0.001 µ,F

4.5-25 pF

4.5-25 pF
100 pf

4.5-25 pF

0.01 µ,F

0.01 µ,F

0.01

p.F

3.3 pF

3.3 pF

0.0033 p,F

1.8 pF

0.01 µ,F

0.1 µ,F

0.1 µ,F

Description

Capacitors

PTM

Cer Var

Cer Var

Mica

Cer Var

Cer Var

Mica

Cer Var
Cer Var
Cer

Cer
Cer
Cer
Cer
Cer

Cer
Cer
Cer
Cer
Cer
Cer

Var

600 V

300V

500 V

SOOY

500 V

SOOY

150V

SOOY
SOOY

SOOY
SOOY
SOOY

S/N Range

10%

5%

10%

+0.25 pF

+0.25 pF

5%

X740-up

Diodes

D474
D476

L443
LR433

Resistors are fixed, composition, + 10% unless otherwise indicated.

R400
R403C
R403E
R404C
R404E

@

152-0008-00
152-0008-00

*108-0214-00
*108-0028-00

302-0470-00 470
309-0148-00 1 Mn
309-0115-00 1 kn
309-0145-00 990 kn
309-0135-00

Germanium
Germanium

Inductors

400 µ,H

180 µ,H (wound on a 4.7 kn, 1 W resistor)

Resistors

½W
½W
½W
½W

10.1 kn

½W

Pree
Pree
Pree
Pree

X301-up

1%

1%
1%
1%

1

Electrical Parts List-Type 2A60

Ckt. No.

R405C
R405E
R411
R421
R423

R425
R430
R431

R432

R434

R436
R437
R441
R444
R446

R447

R450

R450
R451
R453
R455
R460

Resistors

Tektronix

Part No.

309-0142-00
309-0138-00
309-0148-00
311-0184-00
302-0225-00

302-0103-00 10 kn
302-0104-00
302-0101-00

Use 323-0663-00 4.225 kn

309-0192-00 l l.48 kn

Use 311-007 6-00 10 kn

310-0066-00 18 kn lW
302-0101-00
309-0192-00 11.48 kn
311-0220-00 1 kn Var

310-0066-00 18 kn lW Pree
301-0204-00
301-0104-00 100 kn Selected (nominal value)

301-0434-00 430 kn
311-0226-00 2 x
301-0434-00 430kn
302-01 01-00 1000

900 kn

111 kn
1 Mn
l Mn

2.2Mn

100 kn
1000

1000

200 kn Selected (nominal value)

soo kn

Description

½W
½W
½W

½W

½W
½W

½W
½W

½W 5%
½W 5%

½W

(Cont)

Var

½W
½W

½W

Var

Var

Pree
Pree
Pree

Pree
Pree

Pree
Pree

1%
1%

1%

1%
1%

1%
1%

1%
5%

S/N Range

X3439-4029

4030-up

R461
R465
R466
R467
R470

R471
R473
R474

R474

R475
R475

R476

R476
R477
R480
R481
R481

R482
R482
R483

R483

R484

R485
R486

R493

R495

R497

302-0101-00 1000
301-0223-00 22 kn

301-0152-00 1.5 kn
301-0223-00 22 kn
302-0101-00

302-0101-00 1000

308-0054-00 10 kn

303-0472-00 4.7 kn

305-0512-00 5.1 k

301-0820-00 820

Use 301-0390-00 390

303-0472-00 4.7 kn

305-0512-00 5.1 k

308-0054-00
301-0475-00 4.7 MO

301-047 4-00 470 kn

309-0014-00

301-01 04-00 100 kn

309-0003-00

311-0207-00 100 kn

Use 311-0373-00

302-0222-00 2.2 kn

302-0101-00 1000

302-0333-00 33 kn

311-0194-00 2500

302-0270-00 270

302-0270-00

1000

10 kn

lMO

500 kn
250 kn

270

½W
½W 5%
½W 5%
½W 5%
½W

½W

SW

lW

2W
½W
½W 5%

lW

2W

SW
½W 5%
½W
½W

½W
½W

Var 101-739
Var

½W

½W
½W

Var
½W
½W

WW 5%

5%
5%
5%

5%

WW

Pree

Pree

5%
5%

5%
1%

5%
1%

101-3039

3040-up

101-300

301-up

101-3039

3040-up
X740-up

101-739

740-up

101-739

740-up
740-up

10l-431X

2

@I

Ckt. No.

Tektronix

Part No.

Switches

Description

Electrical Parts list-Type 2A60

S/N Range

Unwired Wired

SW 400 260-0251-00

260-0450-00

SW406 260-0347-00 *262-0373-00

V434
V444
V463

V474

V483

154-0022-00
154-0022-00
154-0187-00
154-0187-00
154-0022-00

Slide
Slide

Rotary

6AU6
6AU6
6DJ8
6DJ8
6AU6

Electron Tubes

AC DC GND
AC DC GND
VOLTS/DIV.

101-819

820-up

@I

3

Type 2A60

Mechanical Parts List

BRACKET, NYLON MLD .. 600 WIDE x 1.313 LG. (POT)

Tektronix

Part Number

406-101

BRACKET, INPUT. ATTEN.

9

X

BUSHING, %-32

/1,6 X .412

CABLE HARNESS SN 101-431
CABLE HARNESS SN 432-up
CAP, POT 1" DIA.

x .390 HI

CHASSIS SN 101-431
CHASSIS SN 432-up
CONNECTOR, CHAS. MT.

l CONT. FEMALE (101-1149)

CONNECTOR, CHAS. MT. BNC (1150-up)
CONNECTOR, CHAS. MT. 24 CONT. MALE
COUPLING, CAP NYLON MLD.

1

7;'

LG

32

COUPLING, POT WIRE STEEL
FASTENER, PAWL RIGHT W /STOP
FASTENER, SNAP DOUBLE-PRONGED
GROMMET, RUBBER %
GUIDE, DELRIN % x

13

3

W /

/1,

6

/1,

6

TRACK

LOCKWASHER, INT. #4

406-615
358-010
179-458
179-547
200-247
441-333
441-391

131-081
131-126
131-149
376-010
376-014
214-052

214-153
348-004
351-037
210-004

LOCKWASHER, INT. ¼
LOCKWASHER POT INT. 3/a x ½

11

LOCKWASHER POT INT. 3/a x

/

16

LOCKWASHER, INT. ¼
LUG, SOLDER SE4
LUG, GROUND .025 THICK MILD STEEL

1

/

KNOB, SMALL RED

HOLE PART WAY

8

15

LG.

/1,

6

KNOB, SMALL BLACK ¼ HOLE PART WAY (101-819)
KNOB, SMALL CHARCOAL ¼ HOLE PART WAY (820-up)

17

/

KNOB, LARGE BLACK
KNOB, LARGE CHARCOAL

KNOB, PLUG-IN SECURING

3

NUT, HEX 5-40 x

/

16

HOLE THRU (101-819)

64

17

/

HOLE THRU (820-up)

64

9

x %

/1,

6

NUT, HEX %-32 x ½
NUT, HEX ¼-28 X % X
NUT, %-32 X ½ X

3

/32

11

/16

PANEL, FRONT
PLATE, FRONT

Use

210-011
210-012
210-013

210-046

210-201
210-241
366-038

366-044
366-113

366-058
366-144
366-109
210-406
210-413
210-455
210-494

333-725

387-577

®

PARTS LIST-TYPE 2A60

3

Mechanical Parts List (continued)

Tektronix

Part Number

PLATE, REAR
POST, BINDING ASS'Y 355-507

1

ROD, EXT.

31

/

/

x 3

8

32

& 200-103

ROD, FRAME % x 12¼ TAPPED 8-32 BOTH ENDS
SCREW, 4-40 x

3

BHS

/

16

SCREW, 4-40 x ¼ BHS
SCREW, 4-40 x

% RHS

SCREW, 6-32 x ¼ BHS
SCREW, 6-32x
SCREW, 8-32 x
SCREW, 8-32 x
SCREW, THREAD CUTTING 5-32 x
SPACER, NYLON MLD.

5

/i.

FHS, 100°, CSK, PHILLIPS

6

½ FHS, 100°

½ RHS, PHILLIPS

3

/

16

% FOR CERAMIC STRIP

PAN HS, PHILLIPS

SOCKET, STM7G
SOCKET, STM9G
STRIP, CERAMIC

7

x 9 NOTCHES, CLIP MTD.

/1.

6

387-581
129-053
384-231

Use 384-615

211-007

211-008
211-013
211-504
211-538
212-043
212-044
213-044
361-009

136-008

136-015

124-095

WASHER, STEEL .390 x

9

/

16

210-840

4

PARTS LIST - TYPE 2A60