HP 200AB Owner's manual

OPERATING AND SERVICING MANUAL
MODEL 200AB/ABR
AUDIO OSCILLATOR
SERIALS PREFIXED: 008 -
eo) mae) AMPLITUDE
gess
aeete oscit
28ee8
* garot i |
+
Copyright HEWLETT-PACKARD COMPANY 1955
1501 PAGE MILL ROAD, PALO ALTO, CALIFORNIA, U.S.A.

FREQUENCY RANGE:
BANDS:
CALIBRATION ACCURACY:
FREQUENCY DIAL:
FREQUENCY RESPONSE:
FREQUENCY STABILITY:
gol
DISTORTION:
INTERNAL IMPEDANCE:
HUM AND NOSE:
POWER SUPPLY:
DIMENSIONS:
WEIGHT:
( POWER OUTPUT:
SPECIFICATIONS
20 cps to 40 kc.
x1 20 cps to 200 cps
X10 200 cps to 2 ke
X100 2ke to 20 kc
200 4kce to 40 kc
+2%
including
calibration
error,
warm-up,
and
changes
due
to
aging
of
tubes
and
components.
Six
inch
diameter,
calibrated
over
300°
of
arc.
72
divisions.
Total
scale
length,
63
inches.
Vernier
control
for
precise
setting.
+1
db
entire
frequency
range
when
working
into
rated
load
(reference
1
kc).
Line voltage variations of +10% cause negligible shift in output
frequency.
1 watt or 24.5 volts into a 600 ohm load.
Less than 1%, 20 cps to 20 kc; less than 2%, 20 kc to 40 kc
when ne 4 into pate load or nigper impedance.
O.i5SKZ @ 400Hz +Sdbm /74
Approximately 75 ohms from 20 cps to 20 kc. Output is
balanced to ground over entire frequency range (may be
operated one side grounded, if desired).
At least 66 db below rated output (less than 0.05% of rated
output).
115/230 volts, 50/1000 cps, 70 watts.
Cabinet: 7-3/8" wide, 11-1/2" high, 12" deep.
Rack: 19" wide, 7" high, 11" deep behind panel.
Cabinet: 15 lbs.,
Rack: 19 lbs.,
shipping 20 lbs.
shipping 30 lbs.

Section I
Section II
Section ITI
Section IV
Section V
TABLE OF CONTENTS
FOR
MODEL 200AB AUDIO OSCILLATOR
GENERAL DESCRIPTION
a General .
2 Inspection . o- Bnc8
-3 Power Source Voltage
4
Power
Cable
.
$
OFERATING INSTRUCTIONS
1 Controls and Terminals .
-2
Operation
of
the
Instrument
CIRCUIT DESCRIPTION
3-1 General .
MAINTENANCE
4-1 Removal of Case .
4-2
Tube
Replacement
BN
nea
See
4-3
Replacement
of
Electrolytic
Capacitors
.
4-4
Replacement
of
Lamp
R11
.
4-5
4-6
4-7
230
Volt
Power
Transformer
Conversion
.
Trouble
Shooting
.
TABLE
OF
REPLACEABLE
PARTS
5-1
Table
of
Replaceable
Parts
Lubrication
of
the
Tuning
Capacitor
Drive
Mechanism
Page
I-1
I-1
I-1
I-1
II-1
II - 1
Hil - 1
<deedaa

1-1 GENERAL
The
Model
200AB
Audio
Oscillator
is
designed
for
general
purpose
audio
testing
and
measurements.
The
resistance-capacity
oscillator
used
in
this
in-
strument
will
retain
its
high
degree
of
accuracy
for
long
periods
of
time
with
no
adjustment.
The
push-
pull
output
amplifier
used
in
the
Model
200AB
has
a
large
amount
of
overall
negative
feedback
for
maxi-
mum
stability
and
low
distortion.
The
output
impe-
dance
of
the
instrument
is
600
ohms
balanced
or
un-
balanced.
The
output
voltage
is
adjustable
from
0
to
24.5
volts
(1
watt)
across
a
600
ohm
resistive
load
over
the
full
range
of
20
to
40,
000
cycles/second,
and
is
sufficient
for
modulating
signal
generators
or
other
applications
that
require
considerable
power.
1-2 INSPECTION
After the instrument is unpacked, it should be care-
fully checked for damage received in transit. If any
shipping damage is found, follow the procedure out-
lined in the Claim for Damage in Shipment" section
on the last page of this instruction book.
a
Sect.I Page 1
SECTION |
GENERAL DESCRIPTION
1-3 POWER SOURCE VOLTAGE
The 200AB, like other @instruments, is shipped
from the factory with the power transformer dual
primary windings connected for operation froma
115 volt a-c source unless otherwise specified on
the order. If operation from a 230 volt a-c source
is desired, the transformer primary windings can
be quickly reconnected. Refer to Section IV, para-
graph 4-6 for details.
1-4 POWER CABLE
The three-conductor power cable supplied with this
instrument is terminated in a polarized three-prong
male connector recommended by the National Elec -
trical Manufacturers' Association. The third contact
is an offset round pin added to a standard two-blade
connector which grounds the instrument chassis when
used with an appropriate receptacle. To use this
connector with a standard two-contact receptacle,
an adapter should be used to connect the NEMA con-
nector to the two-contact system. When the adapter
is used, the third contact is terminated in a short
lead from the adapter which can then be connected
to a suitable ground.

2-1 CONTROLS AND TERMINALS
ON
This
toggle
switch
controls
the
power
supplied
to
the
instrument
from
the
power
line.
When
the
instrument
is
turned
on,
a
glow
will
be
visible
through
the
plastic
frequency
dial
index.
RANGE
This
rotary
switch
changes
resistance
values
in
the
frequency
determining
sections
of
the
instrument.
The
position
of
this
switch
determines
the
multiplying
factor
that
must
be
used
to
convert
the
frequency
dial
indication
to
the
actual
output
frequency
of
the
instrument.
AMPLITUDE
This
control
is
a
potentiometer
that
is
used
to
vary
the
amount
of
oscillator
voltage
that
is
applied
to
the
amplifier
section
of
the
instrument,
and
thus
deter-
mines
the
amplitude
of
the
output
voltage.
Frequency Dial
This
control
varies
the
capacity
in
the
frequency
determining
circuits
of
the
instrument,
and
thus
varies
the
output
frequency.
This
dial
is
calibrated
from
20
to
200
and
its
indication
multiplied
by
the
factor
indicated
by
the
RANGE
switch
will
give
the
actual
output
frequency
of
the
oscillator.
The
small
knob
just
below
the
frequency
dial
(on
the
right
hand
side
on
the
rack
model)
is
a
vernier
control
for
this
dial.
600 2, G
The
output
voltage
of
the
instrument
appears
at
these
terminals.
The
two
right
hand
binding
posts
(marked
600
2)
connect
directly
to
the
output
transformer
of
the
instrument.
This
600
2
output
is
balanced
to
ground,
The
left
hand
binding
post
(marked
G)
is
connected
to
the
chassis
of
the
instrument.
Sect. II Page 1
SECTION Il
OPERATING
INSTRUCTIONS
FUSE
The
fuseholder,
located
on
the
back
of
the
instrument,
contains
a
.8
ampere
slow-blowing
fuse.
For
230
volt
operation
this
fuse
should
have
a
.4
ampere
rating.
2-2. OPERATION OF THE INSTRUMENT
The
procedure
for
correct
operation
of
the
Model
200AB
is
as
follows:
a.
Connect
the
power
cable
to
a
suitable
power
source,
>.
Turn
the
power
switch
on
and
allow
about
five
minutes
for
the
instrument
to
reach
its
normal
operating
temperature.
c.
Set
the
Frequency
Dial
and
the
RANGE
switch
for
the
desired
operating
frequency.
For
example:
the
desired
output
frequency
is
5000
cycles/sec.,
set
the
Frequency
Dial
to
50
and
the
RANGE
switch
to
X100
(50
x 100
is
5000).
d.
Connect
the
instrument
to
the
equipment
under
test.
A
description
of
the
various
types
of
out-
put available from the instrument follows:
1)
600
ohm
balanced
or
unbalanced
output
may
be
obtained as follows:
G 600 2 G 600 2
GND
BALANCED
OUTPUT
UNBALANCED
OUTPUT

Sect.IT Page 2
2) If a generator with an internal impedance of 600
ohms is desired, the Model 200AB may be connected
as follows:
600 2 600 2
G G
GND 270 2 270 Q GND
BALANCED OUTPUT UNBALANCED OUTPUT
560 2
Under these conditions the output voltage available
to a 600 ohm load will be reduced to approximately
12 volts and the power will be reduced to approxi-
mately 1/4 watt.
CAUTION
To minimize distortion in the output
voltage, the instrument should work into
a load of 600 to 6000 ohms resistive.
e. Set the AMPLITUDE controls so the Model 200AB
is delivering the desired voltage to the equipment
under test. If a small output voltage with minimum
noise is desired, best results will be obtained by
externally attenuating the instrument output rather
than by decreasing the AMPLITUDE control. The
input to the external attenuator should be approxi-
mately 20 volts for the best possible signal to noise
ratio. The Hewlett-Packard Model 350B Attenuator
may be used for this purpose if the instrument is
being used to supply an unbalanced signal. A balanced
attenuator should be used to attenuate a balanced
signal. A simple voltage divider will also be suf-
ficient in many cases, the total resistance of the
voltage divider should be approximately 600 ohms.
G 600 Q G 600 Q
560 Q 270 2 270 Q
56 Q 56 Q
GND GND
10:1 UNBALANCED 10:1 BALANCED
VOLTAGE
DIVIDER
VOLTAGE
DIVIDER
This type of output attenuator is suitable when the
Output impedance of the instrument is not critical. —
When a low voltage is desired for testing low im-
pedance circuits, it may be obtained by first atten-
uating the oscillator output with a 600 ohm attenuator
and then changing the impedance by means of a
transformer such as the Hewlett-Packard #912-17
or a suitable resistive impedance matching pad.
The Hewlett-Packard line matching transformer
will provide output impedances of 600, 250, 150,
62.5 or 37.5 ohms from a 600 ohm source.
\
|
Careers ig pete oe

3-1 GENERAL
The circuit of the Model 200AB consists of an oscil-
lator section, a push-pull amplifier section, and a
conventional power supply.
The oscillator section consists of a 6SJ7 (V1) anda
6K6 (V2) and is basically a two stage resistance
coupled amplifier. Two feedback loops are used
around this amplifier, positive feedback to set up
oscillations, a negative feedback to reduce distortion
E Positive Feedback
Ou
LAMP
Rit
Negative
Feedback
Figure 3-1.
SE
Sect.1 Page 1
SECTION Iil
CIRCUIT DESCRIPTION
and keep the amplitude of oscillation constant. The
positive feedback network contains fixed resistance
values and a variable capacitor (see Figure 3-1) is
proportioned such that Rj C1 = Rg Cg. The oscil-
lator output voltage is applied to this network and
the oscillator input voltage is derived from it. Since
the input and output signals of a two stage amplifier
are in phase, oscillations will occur when the phase
shift between the voltage applied to the network and
the voltage at the grid of the first stage is zero.
The zero phase shift point is also the point of mini-
R1I6
RI & R2 Correspond to range
resistors RI-R8
Cl & C2 Correspond to ci! thru c4
Simplified Oscillator Circuit

Sect. III Page 2
mum loss through the network as indicated by the
curves of Figure 3-2, The frequency of oscillation,
RELATIVE FREQUENCY = 1 in Figure 3-1, is equal
to 1/2 7 VRj Cy Ro Cg or 1/2 7 RC since R1 = R2
and Cj = Cg. The cathode by~pass capacitors in the
oscillator section (C5, C7) are to correct phase shift
at the higher operating frequencies of the instrument.
The negative feedback network in the oscillator
section minimizes changes in oscillator amplitude
with changes in frequency. The incandescent lamp
is used as a cathode bias resistor, and is also part
of the negative feedback voltage divider in the first
stage of the oscillator (V1). The lamp has a temper-
ature-resistance characteristic such that its resis-
tance will increase in direct proportion to the voltage
applied to it. Changes in the resistance of this lamp
will change the percentage of negative feedback in
the oscillator circuit. When the oscillator voltage
rises, more voltage is applied to the lamp (R11), the
increased voltage will raise the temperature and re-
sistance of the lamp which in turn increases the per-
centage of negative feedback in the oscillator circuit.
Increasing the percentage of negative feedback will
tend to decrease the oscillator output voltage to its
normal operating point. The action will be reversed if
the oscillator output voltage decreases, the negative
feedback voltage will decrease lowering the voltage
across the lamp (R11) which will lower its resistance
thus lowering the percentage of negative feedback and
tending to raise the oscillator output to its normal
operating point. The thermal inertia of the lamp is
great enough so that its resistance will not vary in
accordance with the sine wave voltage at the lowest
frequencies involved.
The amplifier section of the instrument is a feed-
back amplifier circuit containing a push-pull output
amplifier. The first amplifier tube (V3A) is directly
coupled to the phase inverter tube (V3B). The phase
inverter drives the output amplifier tubes (V4 and
V5). The output transformer contains a tertiary
winding for overall negative feedback in the amplifier
section. The cathode bias resistor of the first stage
(V3A) is not by-passed giving additional negative
feedback. This large amount of negative feedback
(over 30 db) in the amplifier section results in very
little distortion being introduced by the amplifier
section of the instrument.
The power supply section of the instrument consists
of a conventional full wave rectifier with pi-section
filter.
PHASE
RELATIVE
Figure 3-2.
FREQUENCY
Ratio
Phase -—--
Positive Feedback Network Characteristics

(i
q
nn i RS om a Taek
CAUTION
Sect.IV Page 1
SECTION IV
MAINTENANCE
The
trimmers
on
the
main
tuning
capacitor
(C2
and
C4)
affect
both
calibration
and
frequency
response.
The
settings
of
these
two
capacitors
should
not
be
changed
unless the instrument needs recalibration.
4-1 REMOVAL OF CASE
On the rear cover of the instrument there are two
screws that hold the case on the instrument. Removal
of these screws will allow the instrument to slide
forward out of the case.
4-2. TUBE REPLACEMENT
When replacing any of the tubes, with the exception of
the rectifier, distortion measurements should be
made to determine whether or not the instrument
still meets the specifications set forth in the front
of this instruction manual. Poor tubes can greatly
increase the noise and distortion components of the
output waveform.
4-3 REPLACEMENT OF ELECTROLYTIC CAPACITORS
The electrolytic capacitors in this instrument are
very high quality capacitors with a life of from five
to ten years,
4-4 REPLACEMENT OF LAMP R11
This lamp operates well below its rating and should
have an infinite life. The lamp may be damaged by
severe mechanical vibration. If the lamp is damaged,
a notch may appear in the output waveform and the
oscillator voltage may be excessive. If the lamp
opens, the circuit will not oscillate. If it is nec-
essary to replace the lamp, the oscillator voltage
should be checked to make certain it falls within
the range specified on the schematic diagram. Mea-
sure this voltage between the negative terminal of
C8 and chassis (see Figure 4-3 for the location of
C8). Adjust the value of RIO until the proper oscil-
lator output is obtained.
4-5
LUBRICATION
OF
THE
TUNING
CAPA
DRIVE
MECHANISM
coer
The tuning capacitor drive mechanism should be
lubricated once or twice a year, the interval de-
pending upon the amount of use. One drop of light
machine oil in each of the holes in the three bearing
projections on the back of the casting is sufficient.
4-6 230 VOLT POWER TRANSFORMER CONVERSION
The 200AB is normally shipped from the factory with
the dual 115 volt primary windings of the power
transformer connected in parallel for operation from
a 115-volt a-c source. The windings can easily be
reconnected in series for operation from a 230-volt
a-c source if desired. Refer to the schematic drawing
and note the transformer primary detail,
To connect T2 for 230-volt operation, remove the
jumpers from terminals 2-3 and 4-5. Connect a
jumper between terminals 3-4. Replace the 0.8
ampere slow-blow fuse with one rated at 0.4 ampere.

Sect.IV Page 2
4-7 TROUBLE SHOOTING
The
following
information
is
designed
to
aid
in
trouble
shooting
a
defective
instrument.
TROUBLE SHOOTING CHART
SYMPTOMS
POSSIBLE
CAUSE
TEST
PROCEDURE
Instrument NOT | Line fuse blown due to| Replace fuse, if this fuse blows
operating, pilot | defective fuse or over-| remove V6 and again replace
light NOT on. load in power supply| the fuse, If this fuse blows it
section of instrument. | indicates:
1. Short circuit in wiring asso-
ciated with powertransformer.
. Short circuit in filament wiring.
1. Locate and clear short
circuit.
2. Locate and clear short
circuit.
3. Replace defective tube.
3. Tube with an internal short
circuit.
. Defective power transformer.
4. Replace power trans-
former.
If fuse does not blow with V6 re-
moved, it indicates:
Replace C12 if proven
defective,
1. Defective filter capacitor C12.
DC resistance between pin 8
on V6 socket and ground is
normally 50,000 ohms (ap-
proximate) and should be mea-
sured with the instrument dis-
connected from the power line.
2. Short in direct current wiring.
2. Locate and clear short
circuit.
Instrument
NOT
|
Oscillator
section
not
|Measure
oscillator
voltage
between
operating,
pilot
|
operating
properly,
{negative
terminal
of
C8
and
ground;
light
ON.
should
agree
with
the
voltage
speci-
fied
on
schematic.
If
oscillator
voltage
not
present,
check:
1. Defective tube.
2. DC voltage in oscillator eir-
cuit (should agree with those
indicated on schematic diagram
within 110%).
3. Short circuit in tuning capacitor
or associated trimmers. Short
circuit in front two sections of
tuning capacitor will cause lamp
(R11) to flash intermittently
(lamp filament dull red) when
the instrument is set at 1000
cycles/second.
1. Replace V1 and V2.
2. Replace component
causing incorrect d-c
voltage.
3. Clear short circuit. If
trimmer (C2, C3, or
C4)is defective replace.
If foreign material is
shorting tuning capaci-
tor (C1) remove care-
fully without bending
plates. If plates have
been damaged and are
touching, straighten
carefully.
4. Clean range switch con-
tacts or replace assem-
bly if there are any open
or damaged resistors.
. Range switch (S1) to make cer-
tain it is making good contact
and that there are no open range
resistors.

L
TROUBLE SHOOTING CHART (CONT'D.)
Sect.IV Page 3
SYMPTOMS
POSSIBLE CAUSE
TEST PROCEDURE
REMEDIES
Amplifier section not
operating properly,
oscillator voltage
correct but no out-
put from instrument.
ae
Check dc voltagein amplifier sec-
tion (V3 thru V5) they should agree
with the values indicated on the
schematic diagram within +10%,.
Test amplifier under conditions
specified on schematic diagram for
voltage measurement(except AM-
PLITUDE at 60)and witha 600 re-
sistive load on the output terminals.
Replace faulty component
in amplifer section.
Instrument
oper-
|
Defective
lamp
(R11)
Notch
apparent
in
output
waveform
|
Replace
lamp
(see
para-
ating,
high
a-
|inoscillator
section.
as
viewed
on
oscilloscope.
graph
4-4).
mount
of
distor-
tion
in
output
voltage
ewes)
ieee
Instrument oper-
ating but very
small voltage
available at out-
put terminals,
oscillator volt-
age normal,
Intermittent
operation of in-
strument.
AMPLITUDE
control rotation
causes unstable
output amplitude
variation.
Amplifier section not
operating properly.
Defective coupling
capacitor C6, C8, C9,
C10, C11. Defective
tube.
AMPLITUDE control
(R17)dirty or worn,
C9 defective.
Check de voltage in amplifer sec-
tion. With proper terminationon
the output, the ac voltage on the
grid of V3A should be 13 volts rms
and the ac voltage appearing onthe
grid (pin 5) of V4 or V5 should be
5 volts rms. (These conditions
apply for 1 watt output into a 600Q
load. )
Determine portion of the circuit
that is operating intermittently by
signal tracing with an oscilloscope
or voltmeter.
1. Check dc voltage on pin 4 of V3,
more than . 2 volt indicates de-
fective C9.
2. Resistance between arm (center
contact) and ground of R17 does
not vary smoothly with rotation
of AMPLITUDE control.
(CAUTION- measure resistance
with instrument disconnected
from power line.)
Replace tube or component.
Replace component caus-
ing intermittent operation.
1. Replace C9.
2. Replace R17.

Sect.IV Page 4
Figure
4-1.
Model
200AB
Top
View

Sect.IV Page 5
RIO
OSC. AMP
CAL. AND
FREQ. RESP
|
c2
© o vt
!
w
!
ao.
=
Model 200AB_ Bottom View
Figure 4-2.

Sect.IV Page 6
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Sect.V Page 1
zB
SECTION
V
REPLACEABLE
PARTS
Standard components have been used in this instrument, whenever
possible, Special components may be obtained from your local
Hewlett-Packard representative or from the factory.
When ordering parts always include:
1. @ Stock Number.
2. Complete description of part including circuit
reference,
Model number and serial number of instrument.
If part is not listed, give complete description,
function and location of part.
7 Corrections to the Table of Replaceable Parts are listed on an
Instruction Manual Change sheet at the front of this manual.
RECOMMENDED SPARE PARTS LIST
Column RS in the Table lists the recommended spare parts quan-
tities to maintain one instrument for one year of isolated service,
a8 Order complete spare parts kits from the Factory Parts Sales
Department. ALWAYS MENTION THE MODEL AND SERIAL NUM-
: BERS OF INSTRUMENTS INVOLVED.

Sect. V Page 2
TABLE OF REPLACEABLE PARTS
Capacitor: variable, air, 4 sections, 0121-0004
12.4 pf to 535 pf
Capacitor: variable, ceramic, trimmer, 0130-0001
7-45 pf, 500 vdcew
Capacitor: fixed, ceramic, 0150-0002
39 pf +5%, 500 vdcew
Same as C2
Capacitor: fixed, mica, 0140-0026
22 pf +10%, 500 vdew
Optimum value selected at factory
Average value shown
Capacitor: fixed, paper, 0160-0024
0.5 pf +10%, 400 vdew
Capacitor: fixed, paper, 0160-0012
1500 pf +10%, 600 vdew
Capacitor: fixed, electrolytic, 0180-0011
20 pf, 450 vdcew
|
| Capacitor: fixed, paper, 0160-0005
| .047 pf +10%, 600 vdew
Capacitor: fixed, paper, 0160-0001
0.1 uf +10%, 600 vdew
Capacitor: fixed, electrolytic, 4 sections, 0180-0025
20 pf/sect., 450 vdew
Not assigned
Capacitor: fixed, titanium dioxide, 0150-0029
1.0 pf +10%, 500 vdew
Optimum value selected at factory
Average value shown
Capacitor: fixed, mica, 0140-0068
220 pf +5%, 500 vdcw
Optimum value selected at factory
Average value shown
Fuse, cartridge: 0.8 amp, 2110-0020
115 volt operation
Fuse, cartridge: 0.4 amp, 2110-0019
230 volt operation
Lamp, incandescent: 6-8V, .15 amp, #47 2140-0009
Power cord . 8120-0050
* Refer to ‘‘List of Manufacturers’ Codes’’,
TQ Total Quantity used in the instrument.
RS Recommended spares for one year isolated service for one instrument.

Sect. V Page 3
TABLE OF REPLACEABLE PARTS
Resistor: fixed,
part of range switch assembly
Resistor: fixed,
part of range switch assembly
Resistor: fixed,
part of range switch assembly
Resistor: fixed, deposited carbon,
part of range switch assembly
Same as R3
part of range switch assembly
Same as R2
part of range switch assembly
Same as R1
part of range switch assembly
Resistor: fixed, wirewound, 0812-0010
3000 ohms +5%, 1W
Resistor: variable, wirewound, 2100-0004
1000 ohms +10%, 2W
a
Lamp, incandescent: 10 W, 250 V 2140-0007
Resistor: fixed, composition, 0690-6831
68,000 ohms +10%, 1W
Resistor: fixed, composition, 0690-5641
560,000 ohms +10%, 1 W
Resistor: fixed, composition, 0693-1021
1000 ohms +10%, 2W
Optimum value selected at factory
Average value shown
Resistor: fixed, wirewound, 0816-0007
7500 ohms +10%, 10 W
Resistor: fixed, composition, 0690-1231
12,000 ohms +10%, 1 W
Optimum value selected at factory
Average value shown
: Resistor: variable, composition, 2100-0089
25,000 ohms +20%, 1/3 W 3
. Resistor: fixed, composition, 0690-1051
1 megohm +10%, 1 W
* Refer to ‘List of Manufacturers’ Codes’’,
TQ Total Quantity used in the instrument.
RS Recommended spares for one year isolated service for one instrument.
SS

Sect. V Page 4
TABLE OF REPLACEABLE PARTS
Resistor: fixed, composition, 0690-4721
4700 ohms +10%, 1W
Resistor: fixed, composition, 0690-2741
270,000 ohms +10%, 1W
Resistor: fixed, composition, 0689-2235
22,000 ohms +5%, 1W
Resistor: fixed, composition, 0690-4741
470,000 ohms +10%, 1W
Resistor: fixed, composition, 0693-3311
330 ohms +10%, 2 W
Optimum value selected at factory
Average value shown
Same as R23
Resistor: fixed, composition, 0690-1531
15,000 ohms +10%, 1W
Optimum value selected at factory
Average value shown
Resistor: fixed, composition, 0693-2731
27,000 ohms +10%, 2 W
Resistor: fixed, composition, 0690-3321
3300 ohms +10%, 1 W
Resistor: fixed, composition,
18 ohms +10%, 1 W 0690-1801
Not assigned
Resistor: fixed, wirewound, 0816-0004
800 ohms +10%, 10 W
Range Switch Assembly 200A B-19W
Switch, toggle: SPST 3101-0001
Transformer, output 9120-0012
Transformer, power 9100-0027
Tube, electron: 6SJ7 1923-0037
Tube, electron: 6K6GT 1923-0033
Tube, electron: 6SN7GT 1932-0025
Same as V2
Tube, electron 1930-0010
or 5AR4 1930-0003
* Refer to ‘“‘List of Manufacturers’ Codes’’.
TQ Total Quantity used in the instrument.
RS Recommended spares for one year isolated service for one instrument.

Sect. V Page 5
TABLE OF REPLACEABLE PARTS
f Circuit foe n (7)
[Set [eccrine Tate, eff
MISCELLANEOUS
Binding Post Assembly: red HP AC-10D
Binding Post Assembly: black with G-T6J
ground link HP
Coupler, insulated HP AC-32A
Disc, vernier drive: on shaft HP G-14A
Disc, vernier drive HP G-14B
g
Fuseholder T 1400-0002
Handle, cabinet HP 1440-0002
Holder, lamp: candelabra AD 1450-0013
(used for R11)
Holder, lamp AD 1450-0012
Insulator, binding post: 3 hole, black HP AC-54B
Insulator, standoff: 3/4 in, long AI 0340-0020
Knob: AMPLITUDE HP G-74K
Knob: RANGE HP G-74N
Spring,gear: tuning capacitor gear HP 624A-36B-5
Spring, compression: for vernier drive Connor | 1460-0019
Window, dial: for curved frequency dial
* Refer to ‘‘List of Manufacturers’ Codes’’,
TQ Total Quantity used in the instrument.
RS Recommended spares for one year isolated service for one instrument,
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LIST OF CODE LETTERS USED IN TABLE OF REPLACEABLE PARTS
TO DESIGNATE THE MANUFACTURERS
MANUFACTURER
Aerovox Corp.
Allen-Bradley Co.
Amperite Co.
Arrow, Hart & Hegeman
Bussman Manufacturing Co.
Carborundum Co.
Centralab
Cinch-Jones Mfg. Co.
Hewlett-Packard Co.
Clarostat Mfg. Co.
Cornell Dubilier Elec, Co.
Hi-Q Division of Aerovox
Erie Resistor Corp.
Fed. Telephone & Radio Corp.
General Electric Co.
General Electric Supply Corp.
Girard-Hopkins
Industrial Products Co.
International Resistance Co.
Lectrohm Inc.
Littlefuse Inc.
Maguire Industries Inc.
Micamold Radio Corp.
Oak Manufacturing Co.
P. R, Mallory Co., Inc.
Radio Corp. of Amerita
Sangamo Electric Co.
Sarkes Tarzian
Signal Indicator Co,
Sprague Electric Co.
Stackpole Carbon Co.
Sylvania Electric Products Co.
Western Electric Co,
Wilkor Products, Inc.
Amphenol
Dial Light Co. of America
Leecraft Manufacturing Co.
Switchcraft, Inc.
Gremor Manufacturing Co.
Carad Corp,
Electra Manufacturing Co.
Acro Manufacturing Co.
Alliance Manufacturing Co.
Arco Electronics, Inc.
Astron Corp.
Axel Brothers Inc.
Belden Manufacturing Co.
Bird Electronics Corp.
Barber Colman Co.
Bud Radio Inc.
Allen D, Cardwell Mfg. Co.
Cinema Engineering Co.
Any brand tube meeting
RETMA standards.
Corning Glass: Works
Dale Products, Inc.
The Drake Mfg. Co.
Elco Corp.
Hugh H. Eby Co.
Thomas A. Edison, Inc.
Fansteel Metallurgical Corp.
General Ceramics & Steatite Corp.
The Gudeman Co.
CODE
ADDRESS LETTER
New Bedford, Mass. AK
Milwaukee 4, Wis. AL
New York, N.Y. AM
Hartford, Conn. AN
St. Louis, Mo. AO
Niagara Falls, N. Y. AP
Milwaukee I, Wis. AQ
Chicago 24, Ill. AR
Palo Alto, Calif. AS
Dover, N. H. AT
South Plainfield, N. J. AU
Olean, N. Y. AV
Erie 6, Pa. AW
Clifton, N. J. AX
Schenectady 5, N. Y. AY
San Francisco, Calif. AZ
Oakland, Calif. BA
Danbury, Conn. BC
Philadelphia 8, Pa. BD
Chicago 20, Ill. BE
Des Plaines, III. BF
Greenwich, Conn. BG
Brooklyn 37, N. Y. BH
Chicago 10, Ill. Bl
Indianapolis, Ind. BJ
Harrison, N. J. BK
Marion, Ill. BL
Bloomington, Ind, BM
Brooklyn 37, N. Y. BN
North Adams, Mass. BO
St. Marys, Pa. BP
Warren, Pa, BQ
New York 5, N.Y. BR
Cleveland, Ohio BS
Chicago 50, Ill. BT
Brooklyn 37, N. Y. BU
New York, N. Y. BV
Chicago 22, Ill. BW
Wakefield, Mass. BX
Redwood City, Calif. BY
Kansas City, Mo. BZ
Columbus 16, Ohio CA
Alliance, Ohio CB
New York 13, N. Y. cD
East Newark, N. J. CE
Long Island City, N. Y. CF
Chicago 44, Ill. CG
Cleveland 14, Ohio CH
Rockford, III. ci
Cleveland 3, Ohio CJ
Plainville, Conn. CK
Burbank, Calif. CL
CM
CN
Corning, N. Y. co
Columbus, Neb. cP
Chicago 22, Ill. cQ
Philadelphia 24, Pa. CR
Philadelphia 44, Pa. cs
West Orange, N. J. CT
North Chicago, Ill. CU
Keasbey, N. J. CV
Sunnyvale, Calif. CW
MANUFACTURER
Hammerlund Mfg. Co., Inc
Industrial Condenser Corp.
Insuline Corp. of America
Jennings Radio Mfg. Corp.
E. F. Johnson Co.
Lenz Electric Mfg. Co.
Micro-Switch
Mechanical Industries Prod. Co.
Model Eng. & Mfg., Inc.
The Muter Co.
Ohmite Mfg. Co.
Resistance Products Co,
Radio Condenser Co.
Shallcross Manufacturing Co.
Solar Manufacturing Co.
Sealectro Corp.
Spencer Thermostat
Stevens Manufacturing Co.
Torrington Manufacturing Co.
Vector Electronic Co.
Weston Electrical Inst. Corp.
Advance Electric & Relay Co.
E. |, DuPont
Electronics Tube Corp.
Aircraft Radio Corp.
Allied Control Co., Inc.
Augat Brothers, Inc.
Carter Radio Division
CBS Hytron Radio & Electric
Chicago Telephone Supply
Henry L. Crowley Co., Inc.
Curtiss-Wright Corp.
Allen B. DuMont Labs
Excel Transformer Co.
General Radio Co.
Hughes Aircraft Co.
International Rectifier Corp.
James Knights Co.
Mueller Electric Co.
Precision Thermometer & Inst. Co.
Radio Essentials Inc,
Raytheon Manufacturing Co.
Tung-Sol Lamp Works, Inc.
Varian Associates
Victory Engineering Corp.
Weckesser Co.
Wilco Corporation
Winchester Electronics, Inc.
Malco Tool & Die
Oxford Electric Corp.
Camloc-Fastener Corp.
George K. Garrett
Union Switch & Signal
Radio Receptor
Automatic & Precision Mfg. Co.
Bassick Co.
Birnbach Radio Co.
Fischer Specialties
Telefunken (c/o MYM, Inc.}
Potter-Brumfield Co.
Cannon Electric Co.
Dynae, Inc.
Good-All Electric Mfg. Co.
ADDRESS
New York I, N. Y.
Chicago 18, Ill.
Manchester, N. H.
San Jose, Calif.
Waseca, Minn.
Chicago 47, Ill.
Freeport, Ill.
Akron 8, Ohio
Huntington, Ind.
Chicago 5, Ill. i
Skokie, Ill.
Harrisburg, Pa.
Camden 3, N. J.
Collingdale, Pa.
Los Angeles 58, Calif.
New Rochelle, N. Y.
Attleboro, Mass.
Mansfield, Ohio
Van Nuys, Calif.
Los Angeles 65, Calif.
Newark 5, N. J.
Burbank, Calif.
San Francisco, Calif.
Philadelphia 18, Pa.
Boonton, N. J.
New York 21, N. Y.
Attleboro, Mass.
Chicago, Ill.
Danvers, Mass.
Elkhart, Ind.
West Orange, N. J.
Carlstadt, N. J.
Clifton, N. J.
Oakland, Calif.
Cambridge 39, Mass.
Culver City, Calif.
El Segundo, Calif.
Sandwich, Ill.
Cleveland, Ohio
Philadelphia 30, Pa.
Mt. Vernon, N. Y.
Newton, Mass.
Newark 4, N. J.
Palo Alto, Calif.
Union, N. J.
Chicago 30, Ill.
Indianapolis, Ind.
Santa Monica, Calif.
Los Angeles 42, Calif.
Chicago 55, Ill. |
Paramus, N. J.
Philadelphia 34, Pa,
Swissvale, Pa.
New York Il, N. Y.
Yonkers, N. Y.
Bridgeport 2, Conn.
New York 13, N.Y.
Cincinnati 6, Ohio
New York, N. Y.
Princeton, Ind.
Los Angeles, Calif.
Palo Alto, Calif.
Ogallala, Nebr.
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