HP 460BR Operating And Servicing Manual

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460BR

FAST PULSE AMPLIFIER

OPERATING

AND

SERVICING

MANUAL

OPERATING AND SERVICING MANUAL

FOR

MODEL

FAST

r

5

J

PULSE

Serial

1720

46OBR

AMPLIFIER
and Above

HE

275

PAGE MILL

WLETT -PACURD COMPANY

ROAD,

PAL0 ALTO, CALIFORNIA,

U.

S.

A.

46

OB

004-3

SPECIFICATIONS

Frequency Res pons e

Gain:
Output Impedance:
Rated Output:

Maximum Output:

Input Impedance:

:

High Frequency
curve when operating into
tive load. 3 db point

Low Frequency
when operating into

prox.
open circuit
ing amplifier.

With
46A-95D Adapter, response +1 db,
to

Approximately 15 db into
Approximately
Linear Amplifier

peak into
into open circuit.

Pulse Amplifier
negative peak open circuit (unilateral) pulse
operation 10% duty cycle.

200

volts output).

3

db at 3 kc when operating into an

@

410B VTVM - when used with

200

mc.

a

ohms (t8 volts input required for 125

-

closely matches Gaussian

a

200-ohm resis-

is

120 mc.

-

off approx. 3 db at 100 kc

a

matched load.

(i.

e., CRT plates) or succeed-

200

ohm load.

200

ohms.

-

Approximately 8 volts

200

ohm load or 16 volts peak

-

Approximately 125 volts

Off ap-

@

200

kc

Noise Figure:
Delay Characteristics:
Rise Time:

Power Supply:
Size:
Weight:
Accessories Available:

6

Less than
Approximately
Approximately 0.003 psec.

overs hoot.

19" relay rack panel, 5-1/4" high; 6-3/4"deep.

12

lbs. Shipping weight 18 lbs.

@<46A-l6A Patch Cord:

@

46A-16B Patch Cord:

@

46A-95A Panel Jack: For
low capacitance.

@

46A-95B Cable Plug: For

@

812-52 Cable:
specific ation.

($3

46A-95C 50-ohm Adapter: Type N to Op460,
50 ohm termination.

@

46A-95D Adapter: @410B VTVM to @460,

no termination.

@

46A-95E Connector Sleeve: Joins two 46A­95B Cable Plugs.

@

46A-95F Adapter: For connecting to 5XP
CRT.

($3

46A-95H Adapter: Type N to @460,
ohm termination.

@

46A-95J Adapter: Type N to ($460, no ter­mination.

@

46A-95K Adapter: @410 VTVM to ($5460,

200

@

460B-95A Adapter: For connecting to
Model 150A Oscilloscope plates.

db.

.

016 psec.

200

ohm termination.

No

appreciable

200

ohms,

200

ohms,

200

200

ohm cable in length to

2'

long.

6'

long.

ohm cables

ohm systems.

200-

fp

CONTENTS

Page

Section

Section

Section

Section

I

I1

I11

IV

GENERAL DESCRIPTION

1-1

1-2

OPERATING INSTRUCTIONS

2-1

2-2
2-3 Controls and Terminals
2-4 Operation

THEORY

3-1

MAINTENANCE
4-1 Cover Removal

4-2 Tube Replacements

4-3

4-4 230

4-5

4-6

4-7 Test Procedure

Description

Accessories.

Inspection
Installation

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

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

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

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

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

OF

OPERATION

Distributed Amplifier

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

Power Supply

Volt

Operation

Trouble Shooting

Replacement

Connector

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

of

200 ohm cable

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

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

...........

........

.........

..........

..........

1

1

3
3

3

5

7

9

9
9

10
10

10
12

Section

V

TABLE
5-1 Table

OF

REPLACEABLE PARTS

of

Replaceable Parts

.......

15

Figure

1.

(A)

Gaussian Response

(B) Typical 460BR Amplifier Response

Figure

2.

(A)

(B)

0.01 psec Pulse Through

0.02

psec

Pulse Through

@

460BR Amplifier

3

Amplifiers in Cascade

SECTION

GENERAL DESCRIPTION

I

1-1

1-2

DESCRIPTION

@

The

designed to amplify high speed pulses to high voltage levels with
negligible overshoot. The output voltage
drive the deflection plates of
tain the fast rise time and shape of high speed pulses, it
sary that the amplifier have
sponse.
approximates the gaussian response and hence retains the charac­teristics of short fast pulses. Figure

The high output of the 460B
tubes by designing the amplifier primarily to amplify pulses
single polarity.

to the maximum level of 125 volts open circuit, while negative
pulses may be amplified to
cuit. A phase inversion occurs within the amplifier
itive pulse applied to the input will be

put. However, either upward or downward deflections of the CRT

is

be connected to the ground terminal of the Model 46OB.

ACCESSORIES AVAILABLE

Model 460B

The frequency response of the

possible, since either the upper or lower deflection plate may

is

a

wide band distributed amplifier especially

is

sufficiently high to

a

cathode ray-tube.

a

wide, reasonably flat frequency re=

@

Model 460B closely

1,

Figure

is

obtained with standard receiving

Thus the Model 460B amplifies positive pulses

a

maximum level of

a

negative pulse at the out-

In order to re=

is

2.

16

volts open cir-

so

that a pos-

neces-

of

a

A complete line
available from the Hewlett-Packard Company,
are listed on the Specification page and
Replaceable Parts, Section

1-3 230 VOLT OPERATION

This instrument
connected for 115 volt operation, unless otherwise specified on the
order.
contained in Section

Complete conversion information for 230 volt operation

of

accessories, for use with the Model 460B,

is

normally supplied with the power transformer

IV

V.

of this manual.

at

the end of the Table of

These accessories

is

is

-1

-

SECTION

OPERATING INSTRUCTIONS

2-1

INSPECTION

This instrument has been thoroughly tested and inspected before

being shipped and is ready for use when received.
After the instrument is unpacked,

for damage received in transit.
follow the procedure outlined in the "Claim for Damage in Ship-

ment" page at the back of this instruction manual.

2-2

INSTALLATION

I1

it

should be carefully inspected

If any shipping damage

is

found,

No special precautions are necessary except, when several
Amplifiers are to be used in cascade,
mon ground,
output must be kept away from the input to avoid the possibility of
feedback.

2-3

CONTROLS

ON

This toggle switch controls the a-c power supplied to the instru-

ment from the power line.

LINEAR, PULSE

This rotary switch selects the type of amplification desired.

i.

e. : mounted in a relay rack, and the high-voltage

AND

TERMINALS

they must have

a

FUSE

The fuseholder, located on the panel, contains the power
line fuse.
fied in the Table of Replaceable Parts, Section

POWER CABLE

The three-conductor power cable supplied with this instrument
is terminated in
third contact

blade connector which grounds the instrument chassis when used

Replacement fuses should be

a

polarized three-prong male connector. The

is

an offset, round pin added to a standard two-

of

the type speci-

V.

460

good com-

-3

-

h

k

3

0

rr

0

z

w

a

0

v

I-

3

a

I-

3

0

cn

5

0

>

Y

a

W

a

PEAK

VOLTS

INPUT

Figure

.25

V

.25V

_I

3.

460

B

LINEAR

460

A

Linearity Characteristics

4608
LINEAR PULSE

2

.H

460A

1

-

of

460BR

460

460

PULSE

Amplifier

B

B

.25V 2.5V

460

A

Figure

4.

460
LINEAR

i

Cascading

8

460

Amplifiers

460

B

PULSE

with an appropriate receptacle.

a

to connect this plug to

is

the adapter

a

short wire. This ground lead should then be connected to

a

suitable ground for the protection of operating personnel.

used, the ground connection

standard two contact system.

An adapter may be used

is

brought out on

INPUT AND OUTPUT

The input and output jacks on the control panel, require special

200-ohm connectors and cables.

2

-4 OPERATION

(See paragraph

Connect the Model 460B to the power line, turn on the power
switch and the instrument

is

in operation.

When

1-2).

To use

as a linear amplifier to amplify sine waves, etc. , or

pulses of either polarity, set the LINEAR-PULSE switch to the

LINEAR position.
position the output
or

8

volts peak into a 200-ohm load.

a

phase reversal between input and output

positive input pulse appears in the output

When the LINEAR-PULSE switch

is

limited to

16

volts peak into an open circuit

It

must be remembered that

is

present and that

as a negative pulse.

To realize the full output capabilities of the Model 46OB,
LINEAR-PULSE switch must be in the PULSE position and

8

tive pulse of about

volts peak be supplied to the input.

is

in this

the

a

a

posi-

In the PULSE position of the LINEAR-PULSE switch the amplifier
tubes are operated at higher than normal supply voltages.
grid bias
Under these

is

increased to keep tube dissipation within ratings.

conditions

(1-8

volt input) the rated tube dissipation

The

is

reached with a duty cycle of 10%. Lower driving voltages will
allow proportionally higher duty cycles, but the output voltage

will be lower.

See Figure

3.

In order to supply this 8-volt positive pulse to a Model 460B, the
units may be cascaded or used with one or more Model 46OA
Wide Band Amplifiers,

see Figure 4.
460 amplifiers, consideration must be given to the polarity
well

as

the amplitude of the pulse to be amplified. For maximum

In

general, when cascading

as

deflection, the set-up must be arranged so that the input to the
last 460BR amplifier is positive and of approximately 8 volts peak
amplitude. This
put pulse.

Hence, an additional 460B can be used when necessary

is

easily done because the 460BR inverts

the

in-

to invert pulse polarity. In most applications an input of about 4

is

volts

sufficient to give satisfactory deflection of a cathode-ray

tube. Certain precautions must be taken when cascading several

460

Amplifiers, see Paragraph 2-2, INSTALLATION.

-5-

SECTION

111

THEORY

3-1

DISTRIBUTED

The extremely rapid rise time of the
use of the distributed amplifier;* the operation of which is explained

as

followsa See Figure

In

the distributed amplifier, the tubes are connected
vals between two artificial transmission lines that have equal pro­pagation velocities. A signal applied to the input terminals passes
down the grid line and appears on each grid in turn.
plate signal currents flow in the plate line, half in one direction
and half in the other.
tube to the output are the same length in terms
traversed, the individual plate signal currents
output termination in phase, thus adding together in the load. The
plate signal currents flowing in the reverse direction are absorbed
without reflection in the reverse plate line termination.
put voltage of

-

nZp

Eo

plate signal current, and

-rip where n

-

AMPLIFIER

5.

Since the paths from the input through any

a

distributed amplifier

is

the number of tubes in the stage, ip

Zp

OF

OPERATION

460B

is

is

the plate line impedance.

is obtained through the

of

will

given by the relation

at

fixed inter-

The resulting

line sections

arrive

The

at

the

out-

is

the

The number of tubes that can be used in

by grid loading which occurs
increased input conductance of the amplifier tubes. This effect

reduces the high frequency gain and in effect restricts the fre-

quency range of the amplifier.

When amplifiers are cascaded, the rise time

that of

In

RC

*

a

single unit in accordance with the relation:

T=

where:

addition to the rise time of the amplifiers, the rise time

combination formed by the capacitance of the deflection gates

Ginzton, Hewlett, et

IRE,

Vola

36,

August,

112

all,

at

high frequencies because of the

T

is

total rise time

t

is

the rise time of a single

(2mbXlO-9

unit

n

is

the number of

Distributed Amplification, Proc.

1948

a

single stage is limited

will

be greater than

sec.)

460

units.

of

the

and the internal resistance
consider e d.

In

any case, the total rise time of any number

in conjunction with any load may be found approximately by the

following relation:

where:

of

the

460B (200

n

=

t

C

T

ohms) shouldbe

of

460

Amplifiers

number

rise time

2.6XlO-9

total shunt capacitance on the
output of the

total rise time.

of

460

of

sec.

one

460

Amplifiers

460

=

in farads.

-8-

SECTION

MAINTENANCE

IV

4-1

4-2

4-3

COVER REMOVAL
You will be able to slide the one-piece cover off the instrument

after removing the four screws in the rear of the cover.

TUBE REPLACEMENTS

In many cases instrument malfunction can be corrected by replac­ing

a

weak or defective tube.
ment or component replacement, check the tubes. Adjustments
made in an attempt to compensate for
complicate the repair problem.

It

is

good practice to check tubes by substitution rather than by

a

the use of
checker" can be misleading. Mark original tubes to insure re­turn to the same socket.
defective

Any tube with corresponding standard EEIA (JEDEC) characteristics
can be used

POWER SUPPLY

"tube checkert1. The results obtained from the "tube

as

a

replacement.

Before making any internal adjust-

a

defective tube

Replace only tubes proved to be weak or

will

often

The 460B power supply delivers two output voltages depending

upon the setting of PULSE-LINEAR switch S1.

With S1 in the PULSE position, selenium rectifiers CR-1 and CR-2

are connected in

between ground and the common junction of capacitor C22,

choke L28, and fuse

270

&

be

ing instrument performance.
When switch S1

CR-2 are connected in parallel as half-wave rectifiers. The dc

output voltage between ground and the point described above
be 110 volts when the line voltage
age

is

Low power supply voltages are generally caused by weak selenium

rectifiers, leaky filter capacitors, shorted tubes or off-value re-

s

is

tor

15 volts.

again not critical.

s

.

a

voltage doubler circuit. The dc output voltage

F2

with the line voltage set to 115 volts will

Ripple voltage can be quite high without affect-

is

in the LINEAR position,

is

set to

rectifiers CR-1 and

115

volts. Ripple volt-

filter

will

-9-

4-4 230 VOLT

The

@

from
ment is normally supplied with the dual primary windings of the
power transformer connected in parallel for 115 volt operation.

To convert for 230 volt operation,
in series as shown on the schematic diagram. The line fuse
must also be changed from
blow,

4-5 TROUBLE SHOOTING

a

OPERATION

Model 460B can be quickly and easily converted to operate

nominal 230 volt

50/1000

0.8

amp slow-blow to 0.4 amp slow-

cps power source.

reconnect the primary windings

The instru-

F1

Low gain, low output, and impaired frequency response are
directly related to tube mutual conductance and power supply out­put voltage.
pear, the power supply output voltages should be checked (para.
4-3) and the tubes should be checked (para.

Impaired frequency response, low gain, and/or excessive hum
can also be caused by open or shorted coils and by defective ter-

minating res is tors or screen resistor

If

Bt

fuse
5654 tube,
the appropriate screen resistor and resistor R1 for possible damage.

Resistor R1

parallel. Any one of these resistors could open without greatly
affecting the ope rating voltage

The cans of electrolytic capacitors C22, C23, and C24 are insu-

lated from the chassis.
chassis the bias voltage

normally not more than about

sonnel, but tube damage

Consequently, should any of the above symptoms ap-

4-2).

s.

F2

blows,

If

a 5654 tube

is

made up of five

look for

If

will

cm

a

Bt short,

was

responsible for the blown fuse,

980

ohms resistors connected in

s

,

these capacitors are shorted to the

also be shorted.

10

volts and

result

if

loss of bias, or

The bias voltage

is

not dangerous to per-

this voltage is removed,

all

a

shorted

check

is

4-6

REPLACEMENT

Cut

200

1,

a

point where shielding and outer insulation are even with
the end of
cable length to tip of banana plug
shorter than trimmed cable length.

ohm cable to length desired,

OF

200

OHM CABLE CONNECTOR

a

center canductor support bead.

will

-10-

Trim end of cable to

After assembly,

be approximately 1/4"

REAR RETAINER CAP

"0"

RING (432-40) CONICAL WASHER (46A-76K)

REAR PLUG BODY BANANA PLUG

(125-33

1

CTIONS)

L

d

t

OUTER INSULATION CENTER CONDUCTOR FRONT PLUG ASSEWBLY

Fig.

Remove outer cable insulation for a distance of

2.

cable end.

3,

Remove three support beads from center conductor.
do this, upset shielding just enough to release beads.

4.

Slide the following parts over the cable shielding in order
given: rear retainer cap, large washer(s), rubber
ring. Either one or two washers are included with the
connector parts
134 washers supplied. Purpose of additional washer
given in step9

5. Slide rear plug body over shielding. Hold rear plug body
against end of outer insulation and cut off shielding 3/16"

from beveled end of rear plug body.

6

Exploded View of the 46A-95B Assembly

at

the factory.

Use

all

of the large 512=

.

(46A

-

2"

76C)

from

To

l'O1r

is

J

6.

Fan shielding out and bend back over rear plug body.

Trim off any shield wire protruding beyond beveled edge.

7.

Place conical washer over shielding with

end of plug.

8.

Insert center conductor through hole in center of front

plug assembly, slide assembly back over conical washer.

Thread rear retainer cap on front plug assembly.

must be firmly tightened

so

that

41-

it

cannot be rotated on

flat

side toward

Plug

end of cable,

9.

Measure distance between front edge of rear retainer cap

and front edge of front plug assembly,
not be less than 31/32",
in step d will increase this distance,

10,

Wrap and solder the center conductor to the base of the

banana plug.

tight when connecting to banana plug,

11,

Resistance between outer connectors must be less than one
ohm,
than one ohm,
center connectors must be greater

4-7 TEST PROCEDURE

Resistance between center connectors must be less

is

The use of strap wrenches

Additional washers installed

Do

not pull center conductor excessively

Resistance between outer connectors and

than

recommended,

This distance must

500

megohms.

as

Testing of the 46OB is
needed. However, anyone with the necessary equipment for mak­ing the several somewhat complex test set-ups can complete the
procedure.
will be required.

Signal Sources
Voltmeters
Oscilloscope
Attenuators
Miscellaneous

The complete Test Procedure

a

Service Note.

Service Notes

to supply you with copies on request.
Your local

specially trained personnel to assist you with any engineering, ap-

plication, test, or repair problems you may have with

The following

.

. .

Perhaps your most convenient source for these

is

your local

@

Representatiye' also maintains complete facilities and

a

long tedious procedure, and

@

,

.

,

Models 212A, 608C, and 65OA.

. . .

,

.

Models

.

. . , . . . .

.

. .

. . . .

@

is

not often

instruments or their equivalent

410B

.

Models 355Aand 355B.

. , . .

is

available from the

Representative who will be pleased

and 400D/H/L,

, ,

Model 15OA.

Cable Adapters

@

Factory

@

Instruments.

as

-12-

Figure

7.

Top View of @Model 460B

Fast

Pulse Amplifier

Figure

8,

Bottom View of

@

Model 460B

-

13-

Fast

Pulse Amplifier

f"

Q'

0

-

14-

SECTION

V

TABLE

OF

REPLACEABLE PARTS

NOTE

Any changes in the Table of Replaceable Parts will be

listed on a Production Change sheet at the front of this

manual.
When ordering parts from the factory always include

the following information:

Instrument model number
Serial number

-hp- stock number of part

Description of part

460B

TABLE OF REPLACEABLE PARTS

CIRCUF

REF.

C1 thruC4

c5

C6 thru ClS

c

20

c21

C22,23,24

C25 thru

c37

CRl, 2

F1

DESCRIPTION,

C apac i to

Capacitor: fixed, ceramic disc,

Same
Same
Capacitor

Capacitor: fixed, electrolytic

Capacitor: fixed, titanium dioxide,

Rectifier, metallic

Fuse, cartridge:

Fuse, cartridge: 0.4 amp, for 230V

r

:

.Ol

pf

.02

v

f

as

C1

as

C5

:

50

1~.

f

tol.

40pf, 450 vdcw

2.2ppf

operation,

ope ration,

MFR.

fixe d, c e rami c

tol.

-O%,

tol.

-0%

fixed, electrolytic

-1070

+lo%,

s

low-blow

s

low -b low

*

Ba

tlOO%,

+loo%,

t2OO70,

500

vdcw

Q.

8 amp, for 115V

MFR. DESIGNATION

,

1000 vdcw CC*

600

vdcw Radio

Material Corp.

,

50

vdcw

,

X*

cc*

DD*

AA*

T*

@

STOCE
NO.

15-43

15-85

18-50

18-40HP

15-52

212-73
211-57

211-56

-

#

18

2

1

3

13

2

1

F2

t1

J1, 52

L1

L2 thru L7
L8 thru L14
Ll5thru 20
L21 thru 27
L28

?I

t1

t2

Fuse, cartridge: 1/4 amp,

regular type 3AG

Lamp, incandescent: 6-8V,

.15 amp, #47
Jack, panel
See R2
Coil Assembly
Coil Assembly

Coil Assembly
Coil Assembly
Reactor: 6H
Cable, power Elec. Cords Co.

Resistor: fixed, precision, 980 ohms,

includes
capacitors HP*

Resistor: fixed, deposited carbon,

195 ohms

@

125 ma, 240 ohms

5

resistors and 4.01 p f

+l%,

1/8 W (includes L1)

T*

N*

HP*

HP*

HP*

HP*
HP*
HP*

HP*

211-6

!11-47

C6A-76

460B-95E
460B -95D
460B-95B
460B-95C
911-47
612-56
460B-67

160B-60

1

1

2

1

1

1
1
1

1

1

1

'

See

It

List

of

Manufacturers Code Letters

#

Total quantity used in the instrument.

For

Replaceable

-16-

Parts

Tablett

.

-

460B

TABLE OF REPLACEABLE PARTS

CIRCUrr

REF.

R3 thru
R15,

R16

R17

R18

19

R

R20

R21
R22

s1

52
T1

V1

thru Vl?

DESCRIPTION, MFR.

Res

is

tor: fixed, composition,

12 ohms

Re

s

is

t o r

195 ohms

Resistor: fixed, composition,

5600 ohms

Resistor: fixed, composition,

120 ohms

Res

is

tor: fixed, composition,

18 ohms

Resistor: fixed, composition,

33 ohms

Same

as

Same

as

Switch, rotary

Switch, toggle: SPST

Transformer, power
Tube, electron: 5654

+lo%,

:

fixe d, de po

+1%,

+lo%,

+lo%,

+lO70,

+lo%,

R19
R3

*

1/2

W

s

i

te d carbon,

1/8

W

1/2

2

W

1

W

1

W

&

MFR. DESIGNATION

B*

NN*

W

B*

B*

B*

B*

HP*

IP

HP*

zz*

@

STOCH

NO.

~ ~~

23-12

30-195

23-5600

25-120

24-18

24-33

310-86
310-11
310-133
Z12 -5654

-

#

14

1

1

1

2

1

1
1
1

13

MISCELLANEOUS

Adapter, type

termination

Adapter, for

@

460, no termination
Adapter, for 5XP-CRT
Adapter, for Tektronix 511

Adapter, type llN1l to @460, 200 ohm

termination

Adapter, type llN1* to ($460, no

termination

Adapter,

of @460, 200 ohm termination

Adapter, 200 ohm cable to

deflection plates
Note: for 150's below serial

800,

l1Nt1

to @ 460,

@

410B to output of

@

410A/B ac probe to output

also order 150A-95P

@

50

150A

ohm

HP*

HP*
HP*
HP*

HP*

HP*

HP*

HP*

i6A-95C

i6A-95D

L6A-95F
C6A-95G
C6A-95H

C6A-95J

r6A-9 5K

:60B

-9

5A

:

See lvLisl

If

Manufacturers Code Letters

Total quantity used in the instrument.

For

Replaceable

-17-

Pa

8

Table"

.

460B

TABLE OF REPLACEABLE PARTS

CIRCUIT

REF.

DESCRIPTION, MFR.

Cable, plug, for
Connector sleeve, joins two 46A-95B

cable plugs

Deflection plate terminal board for

@

150A with serial numbers below

800

when using Adapter 460B-95A

F

useholder

Jack, panel assembly, for

connector

-

Knob: PULSE
Patch cord,
Patch cord, 6 feet,
Pilot Lamp Assembly

Retainer plate for panel jack

LINEAR

2

feet, 200 ohm cable

200

ohm cable

200

*

&

MFR. DESIGNATION

200

ohm

ohm cable

HP*

HP*

HP*

T*

HP*
HP*
HP*
HP*

IP

HP*

@

STOCE
NO.

~~ ~~

46A-95B

46A-95E

150A-95P

140-16
46A-95A

G-74N
46A-16A

46A-16B

145-2

46A- 7 6A-

#

-

2

1

1

1

See

1t

List

of

Manufacturers Code Letters

#

Total quantity used

in

the instrument.

For

Replaceable

-18-

Parts

Table"

.

DESIGNATE

TO

THE

MANUFACTURERS

CODE

LETTER

A
B
C
D

E

F

G

H

HP

I

J

K

L

M

N

0

P

Q

R

S
T
U
V
W
X
Y
Z
AA
BB

cc

DD

EE

FF

GG

HH

II

JJ

KK
LL

MM

NN

00

PP

QQ

RR

ss

TT

uu

vv
ww

xx

YY

zz

AB
AC
AD
AE
AF
AG
AH
AI
AJ

MAN U FACTU RER
Aerovox Corp.

Allen-Bradley

Co.

Amperite Co.
Arrow,

Hart

&

Hegemon

Bussman Manufacturing

Co.

Carborundum Co.

Centrala

Cinch-Jones Mfg.
Hewlett-Packard

Clarostat
Cornell

Hi-Q

Erie

b

Co.

Mfg.

Co.

Dubilier

Elec.

Division

of

Aerovox

Resistor Corp.

Co.

Co.

Fed. Telephone & Radio Corp.

General
General

Girard-Hop
Industrial Products

International

Electric

Co.

Electric Supply Corp.

kins

Co.

Resistance

Co.
Lectrohm Inc.
Littlefuse
Maquire Industries

Inc.

Inc.

Micamold Radio Corp.

Oak

Manufacturing

P.

R.

Mallory

Radio Corp.
Sangamo

Sarkes

Electric

Tanian
Signal Indicator
Sprague

Electric

Stackpole Carbon
Sylvania

Western

Electric

Electric

Wilkor Products,

Co.,

of

America

Co.

Co.

Products

Co.

Inc.

Co.

Inc.

Co.

Co.

Co.

Amphenol
Dial Light
Leecraft Manufacturing
Switchcraft,

Gremar

Co.

of

America

Inc.

Manufacturing

Co.

Co.

Carad Corp.

Electra

Manufacturing
Acro Manufacturing
Alliance Manufacturing
Arc0

Electronics,

Co.

co.

CO.

Inc.

Astron Corp.
Axel Brothers

Inc.

Belden Manufacturing Co.

Bird

Electronics

Barber

Colman

Bud Radio
Allen D. Cardwell Mfg.

Corp.

Co.

Inc.

Co.

Cinema Engineering Co.
Any brand tube meeting

RETMA standards.
Corning
Dale Products,
The Drake Mfg.

Elco

Thomas A. Edison,

Hugh

Glass

Corp.

H.

Eby

Works

Inc.

Co.

Co.

Inc.

Fansteel Metallurgical Corp.

General

The Gudeman

Ceramics & Steatite

Co.

Corp.

ADDRESS

New

Bedford, Mass.

Milwaukee

New York,

N.

4,

Wis.

Y.

Hartford, Conn.

St.

Louis,

Mo.

Niagara Falls,
Milwaukee

Chicago

Palo Alto,
Dover,

N.

I,

Wis.

24,

111.

Calif.

N.

H.

South Plainfield,

Olean,

N.

Y.

Erie

6,

Pa.

Clifton,

N.

J.

Schenectady

Son

Francisco,

Oakland,

5,

Calif.

Calif.

Danbury, Conn.
Philadelphia

Chicago

Des

20,

Plaines,

8,

111.

111.

Pa.

Greenwich, Conn.

Brooklyn

Chicago

37,

10,

N.

111.

Y.

Indianapolis, Ind.
Harrison,

Marion,

111.

N.

J.

Bloomington, Ind.
Brooklyn
North Adams,

St.

Warren,

New

Marys,

York

37,

Pa.

5,

Pa.

N.

N.

Y.

Mass.

Cleveland, Ohio
Chicago

Brooklyn

New

Chicago
Wakefield,

Redwood
Kansas City,
Columbus

York,

50,

37,

22,

City,

N.

N.

Mass.

16,

111.

Y.

Y.

111.

Calif.

Mo.

Ohio

Alliance, Ohio

New

York

13,

N.

East

Newark,

N.

Long Island City,

Chicago
Cleveland

Rockford,

Cleveland

Plahville,

44,

111.

3,

Conn.

111.

14,

Ohio

Ohio

Burbank, Calif.

Corning,

N.

Y.
Columbus, Neb.
Chicago

Philadelphia
Philadelphia

West Orange,

22,

111.

24,

44,

N.

North Chicago,

Keasbey,

Sunnyvale,

N.

J.

Calif.

Y.

N.

N.

Y.

Y.

J.

N.

Pa.
Pa.

J.

111.

CODE

LETTER

J.

Y.

Y.

MANUFACTURER

AK

Hammerlund Mfg. Co.,
Industrial Condenser Corp.

AL
AM

lnsuline Corp.

AN

Jennings Radio Mfg. Corp.

E.

A0
AP

AQ
AR
AS
AT
AU
AV

AW
AX
AY
AZ

BA

BC
BD

BE

BF

BG

BH

BI

BJ

BK

BL

BM

BN

BO

BP

BQ

BR
BS

BT
BU
BV

BW

BX

BY

BZ

CA
CB
CD

CE

CF
CG
CH
CI
CJ
CK
CL
CM
CN

co

CP
CQ
CR

cs

CT

cu

cv

cw

F. Johnson Co.
Lenz Electric Mfg.
Micro-Switch
Mechanical Industries
Model Enq. & Mfg.,

The Muter Co.

Ohmite Mfg.
Resistance Products
Radio Condenser

Shallcross Manufacturing

Solar

Manufacturing Co.

Sealectro Corp.

Spencer Thermostat

Stevens

Manufacturing Co.
Torrington Manufacturing
Vector

Electronic

Weston

Electrical

Advance

E.

1.

DuPont

Electronics

Aircraft Radio Corp.
Allied

Control

Augat Brothers,
Carter Radio Division
CBS

Hytron

Chicago Telephone Supply

Henry

L. Crowley
Curtiss-Wright Corp.
Allen

B.

DuMont Labs

Excel

Transformer

General

Radio

Hughes Aircraft

International

James

Knights

Mueller

Electric

Precision

Radio

Essentials

Raytheon Manufacturing
Tung-Sol Lamp Works,
Varian Associates
Victory Engineering Corp.
Weckesser
Wilco Corporation
Winchester Electronics,

Mako

Tool & Die

Oxford

Electric

Camloc-Fastener Corp.
George K.
Union Switch & Signal
Radio Receptor
Automatic

Bassick

Co.

Birnbach Radio Co.
Fischer Specialties
Telefunken
Potter-Brumfield Co.
Cannon

Electric

Dynac,

Inc.

Good-All

of

America

Co.

Inc.

Co.

Co.

Co.

Co.

Inst. Corp.

Electric

&

Relay

Tube Corp.

Co.,

Inc.

Inc.

Radio

&

Electric

Co.,

Co.

Co.

Co.

Rectifier

Co.

Co.

Thermometer

Inc.

Co.

Corp.

Garrett

&

Precision

(c/o

MVM, Inc.)

Co.

Electric

Mfg.

Inc.

Prod.

Co.

Co.

Co.

Inc.

Corp.

&

Inst.

Co.

Inc.

Inc.

Mfg.

Co.

Co.

co.

Co.

ADDRESS

New

York

1,

N.

Chicago
Manchester,

Son

Waseca,

Chicago
Freeport,
Akron

Jose,

8,

18,

111.

N.

Calif.

Minn.

47,

111.

111.

Ohio
Huntington, Ind.
Chicago

Skokie,

111.

5,

111.

Harrisburg, Pa.

Camden
Collingdale,

Los Angeles

New

Attleboro,

3,

N.

58,

Rochelle,

Mass.

J.

Pa.

N.

Mansfield, Ohio

Van

Nuys,

Calif.

Los Angeles

Newark

Burbank,

Son

Philadelphia

Boonton,

New

b5,

5,

N.

J.

Calif.

Francisco, Calif.

18,

N.

J.

York

21,

N.
Attleboro, Mass.
Chicago,
Danvers,

111.

Mass.

Elkhart, Ind.
West Orange,
Carlstadt,

Clifton,

Oakland,
Cambridge

Culver

El

Segundo,

Sandwich,

N.

Calif.

City,

N.

J.

39,

Calif.

Calif.

111.

N.

J.

Cleveland, Ohio
Philadelphia
Mt. Vernon,
Newton,

Newark

Palo

Union,
Chicago

4,

Alto,

N.

Mass.

N.

Calif.

J.

30,

30,

N.

111.

Y.

J.

Indianapolis, Ind.

Santa

Monica,

15,

N.

N.

42,

Pa.
1

I,

Y.

2,

13,

6,

N.

Ind.

Calif.

111.

J.

34,

N.

Conn.

N.

Ohio

Y.

Calif.

Los Angeles
Chicago

Paramus,

Philadelphla

Swissvale,

New York
Yonkers,
Bridgeport

New

York

Cincinnati

New

York,

Princeton,

Los Anqeles,

Palo

Alto, Calif.

Ogallala, Nebr.

Y.

H.

Calif.

Y.

Calif.

Pa.

Y.

J.

Mass.

Pa.

Calif.

Pa.

Y.

Y.

@)

MANUAL CHANGES

Serial

c22

thru

C24

11:

P1:
R20

MISC,

2438

:

:

:

and

above:

Change

20uf/section,

Change

-hp- Stock

Change

Dele

Change

Change

Mfr.,

to

to

to

te

to

jewel,

HP

MODEL

FAST

capacitor,

lamp,

No.

power cord;

lampholder

PULSE

fixed,

450

vdcw;

incandescent,

211-78,

pilot

lamp,

LCGOBR

AMPLIFIER

electrolytic, 2 sections,

-hp-

Stock

6-8V,

Mfr.

-hp-

,

Stock

-hp-

to

I7

Stock

-hp-

No.

2

No.

No.

Stock

18-109,

pin

base,

812-106,

145-25,

No.

145-23A,

Mfr.,

GE

Wr.,

Mfr.,

CC

#12;

TT

HP

For

instruments

Serial

For instruments with Serials Prefixed:
changes

C5,19:

c20

10/18/60

1720

in

addition

:

400

-

Change

100

Change

46OBR

and

vdcw;

vdcw;

with

above

to

to

3/3/60

1/12/60

Serials

applies

to

those

capacitor, fixed, ceramic, .Oluf

-hp-

capacitor: fixed, ceramic,

-hp-

Prefixed:

with

previously listed:

Stock

Shock

NO.

No.

0030,

all

corrections

041-,

0150-0098,

15-161,

the

include the following

Mfr.,

.OTuf

Mfr.,

manual

listed

22V%9,

RAE

22076,

NN

for

above.