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MODEL 240 VOLTAGE SUPPLY CONTENTS



TABLE OF CONTENTS



Page

Section I. - Introduction. . . . . , . . . . . . . . . . . . . . l-l

Section II. - Specifications . . . . . . . . . . . . . . . . . . 2-1

Section III. - Operation . . . . . , . . . . . . . . . . . . . . 3-L

Section IV. - Circuit Description . . . . . . . . . . . . . . . 4-l

Section V. - Maintenance . . . . . . . . . . . . . . . . . . . 5-l

Section 6. - Replaceable Parts List . . . . . . . . . . . . . . 6-1

Voltage and Resistance Chart . . . . . . . . . . . . . . . . . .

Schematic Diagram . , . . . . . . . . . . . . . * . . * . . . .
MODE,L 240 VOLTACL LUPI'LY




SECTION I - INTRODUCTION


The Keithley Model 240 Regulated High Voltage Supply is a line oper-
ated source of dc potential, It provides constant, accurate output
for safe and convenient testing of insulation, diode and capacitor
leakage resistance, and it thus complements the Keithley line of
electrometer equipment, The output can be set from zero to 1000
volts in increments of one volt,
The Model 240 may also be used as a general purpose laboratory volt-
age supply, furnishing excitation potentials to ion chambers and
photocells, and supplying a buck-out potential for precise voltage
measurements by the null method, It may be used as a stable dc
potential in checking dc amplifier gains! calibrating meters, and
in production testing, Used in conjunction with a Keithley electro-
meter, resistance over the range of 0.1 ohm to 1016 ohms can be
measured,




FIGURE 1. Keithley Model 240 Regulated High Volt-
age Supply equipped with end frames for bench use.




0762R l-l
MODEL 240 VOLTAGE SUPPLY SPECIFICATIONS



SECTION II - SPECIFICATIONS



OUTPUT:
Voltage: 0 to 1000 volts dc in L-volt steps.
current: 10 milliamperes dc maximum.
Polarity: Positive or negative with respect to chassis.

ACCURACY: kl% of dial setting or 2100 millivolts, whichever is greater.

RESOLUTION: A "Trim" Potentiometer permits interpolation between steps with a resolution
better than 15 millivolts.

RESETABILITY AND STABILITY: kO.O5% or 0.05 volt the first hour or in subsequent 8-hour
periods, after a 20-minute warm-up.

LINE REGULATION: f0.05% or 0.05 volt for 10% change in line voltage.

LOAD REGULATION: f0.05% from no load to full load.

RIPPLE: Less than 3 millivolts rms above 5 cps.

OUTPUT IMPEDANCE: Less than 15 ohms.

RECOVERYTIME: 50 milliseconds from no load to full load.

OVERLOADPROTECTION: Output is disconnected within 50 milliseconds if current exceeds
about 12 milliamperes.

CONNECTORS: output: Teflon-insulated UHF type.

POWER: 105-125 or 210-250 volts, 50-60 cps, 70 watts.

DIMENSIONS, WEIGHT: 5-l/4 inches high x 19 inches wide x 10 inches deep; net weight, 22
pounds.

ACCESSORIES SUPPLIED: Mating connectors.




11b5R 2-1
MODEL 240 VOI.TAGE SUPPLY OPERATION



SECTION III - OPERATION

General - The Model 240 Regulated High-Voltage Supply is shipPed
me with tubes and fuse, and is accurately calibrated at the
factory, Plug the power cord into a source of proper voltage and
frequency, Unless otherwise specified, the unit is wired for llOv,
50-60 cps. For 220~volt operation, change the jumpers on the trans-
former primary as indicated in the schematic diagram, Turn the POltiEII
switch to ON. Allow two minutes for the circuit to stabilize after
turning it on,

Connections - UHF type output connectors are on the front and rear
of the instrument, Due to the high potential available from the
output, use a mating connector and polyethelene or teflon insulated
cable for maximum user protection, When making connections with
the power on, it is recommended that the OUTPUT switch be set to OFF,
ycJ;;t': - The output polarity may be chosen by setting the OUTPUT
to the appropriate position.
Output Voltage - The output voltage is set with the three main dials
on the panel, For small adjustments in the output voltage to facil-
itate making a critical measurement, the INCREMENTAL VOLTS knob can
be employed, For more accurate voltage setting than possible with
the panel dials. connect an accurate voltmeter to the output connector
and set the desired voltage with the main dials~and the INCREMENTAL
VOLTS potentiometer.
For the accuracy specification to hold, the INCREMENTAL VOLTS must
be set to zero,
Overload Protection - Overload protection is provided at a current
of about 12 milliamperes. If the current exceeds that amount, the
output is disconnected within 50 milliseconds; the circuit can then
by reset with the OUTPUT switch on the front panel, In this way,
not only is the instrument protected, but in most cases the compon-
ent being tested as well.




3-l
0762R
!ulODEL 240 VOLTAGE SUPPLY CIRCUIT DESCRIPTION



SECTION IV - CIRCUIT DESCRIPTION

Figure 2 shows the simplified circuit diagram, while 12282n
enclosed at the back , gives the circuit details,




T OUTPUT




P
`WOLTAGE REFERENCE TUBE
-I- -150


FIGURE 2
Refer to Figure 2. Two cascaded electronic series-regulators furnish
a high degree of load and line regulation, The first regulator reduces
the effect of input voltage change, while the second regulator provides
the means for varying the output voltage and provides a low output im-
pedance and very close regulation, Resistors Rl and R2 determine the
output voltage by referencing it to a selected, aged premium VR tube,
The current supply to the reference tube is doubly regulated, Relays
Kl and K2 are overload protectors, disconnecting the output within 50
milliseconds,
Refer to 12282n, The high-voltage output of transformer Tl is recti-
fied and supplied to the plate of V2, the series tube in the pre-regu-
later, V4 compares a fraction of the pre-regulated voltage from div-
ider network RllO to R113 to the 150 volts of V6. This standard reg-
ulator supplies approximately 1300 volts to the final regulator,




0762R 4-1
CIRCUIT DESCRIPTIOR MODEL 240 VOLTAGE SUPPLY



The final regulator consists of series tube V3 and difference ampli-
fier V5 and Vll,
Vll compares the potential between the minus side of the supply and
the mid-point of the divider formed by resistors R129 to R158, chosen
by the voltage controls on the panel, and resistors R145 and R127,
going to the minus 85~ reference potential supplied by VlO. Since
the action of the negative-feedback circuit is to maintain pin 7 of
Vll at ground, the output voltage must assume whatever value neces-
sary to satisfy this condition, For example) since the resistance
from the grid to the minus 85 volt reference (R148, R127) is set so
that 100 microamperes must flow to have pin 7, Vll at ground poten-
tial, the side of the divider going from pin 7, Vll to the plus out-
put, must also be of a value which will allow 100 microamperes to
flow from B-plus to the negative reference since the tube grid draws
negligible current, Therefore, if the current is fixed, the output
voltage is a linear function of the resistance from B-plus to pin
7, Vll. With the values used here, the output voltage changes by
exactly 100 volts per megohm of resistance added by switches S3, S4,
S5, and the INCREMENTAL VOLTS control, When the main dials are set
at zero, there is no resistance between the cathode of V3 and the
divider return to the input grid of Vll, Thus, the output and feed-
back points are tied together and this is the condition for zero volts
output, ZERO control R116 adjusts the common cathode current in Vll
so that both grids may be set at zero volts, The CALIBRATE control,
1~127, is adjusted so that exactly .l milliampere flowing through R148
and R127 produces a voltage drop equal to the negative return voltage
from VlO.
Overload protection is provided by relays Kl and K2. The current
sensing relay, K2, energizes re,lay Kl when the output current rises
to about 12 milliamperes, Kl disconnects the output terminal from
the voltage supply, holds itself closed through the first section
of S2, and lights the red overload light, Switching the OUTPUT
switch, S2, to OFF opens the self-locking loop of Kl.




4-2 0762R
MODEL 240 VOLTAGE SUPPLY



SECTION V - MAINTENANCE

BE EXTREMELY CAREFUL that the Regulated Voltage Supply is discon-
nected from the power line when unscrewing the tap or bottom covers,
Many circuit components are 1000 volts above ground, and if the out-
put polarity is negative, the negative side of the circuit is 1000
volts below ground, Therefore, do not assume that it is safe to
touch any part of the circuit when the power is on,
Tube Replacement
With the exception of VlO (OG3) and Vll (lZAX7), all tubes can be re-
placed with jobber stock tubes, A replacement for VlO (OG3) should
be aged for 300 hours, A replacement for Vll should be selected for
low drift, hum and noise, Ampe,rex ECC 83-12AX7 is recommended, Both
tubes, aged and selected,are available from Keithley Instruments
with stock numbers EV OG3-240 (VlO) and EV 12AX7-240 (Vll).
Recalibration
The zero setting can be readjusted with potentiometer R116, mounted
on the channel just behind the front panel, Set the OUTPUT VOLTS
switches and the INCREh!ENTAL VOLTS potentiometer to zero, Connect
a voltmeter to the output terminals and adjust R116 until the out-
put reads zero,
The voltage calibration can be set with potentiometer R127. Con-
nect an accurate voltmeter to the output terminal, Set the OUTPUT
VOLTS switches to the highest voltage which may be read by the volt-
meter and adjust R127 until the voltmeter reads the dial setting.
The settings will be no more accurate than the standardizing meter;
and it is well to let the instrument warm up for about an hour be-
fore recalibrating, Recalibration will be necessary only after re-
placement of VlO or Vll,




5 -1
0762R
MODEL 240 VOLTAGE SUPPLY REPLACEABLEPARTS



SECTION 6. REPLACEABLEPARTS



6-1. REPLACEABLEPARTS LIST. The Replaceable Parts List describes the components of the
Model 240. The List gives the circuit designation, the part description, a suggested
manufacturer, the manufacturer's part number and the Keithley Part Number. The last column,
"Lot.", lists the part's location. The name and address of the manufacturers listed in
the "Mfg. Code" column are contained in Table 2.

6-2. HOWTO ORDERPARTS.

a. For parts orders, include the instrument's model and serial number, the Keithley
Part Number, the circuit designation and a description of the part. All structural parts
and those parts coded for Keithley manufacture (80164) must be ordered from Keithley
Instruments, Inc. In ordering a part not listed in the Replaceable Parts List, completely
describe the part, its function and its location,

b. Order parts through your nearest Keithley distributor or the Sales Service Depart-
ment, Keithley Instruments, Inc.


smp ampere n ohm

: Chassis OS OUTPUT Switch
:bVar Carbon Variable
ZerD Ceramic, Disc P pica (10-l*)
hllp Composition PC Printed Circuit PC24A

DCb Deposited Carbon Ref. Reference
RP Rear Panel
ETB Electrolytic, tubular
P micro (10m6)
E farad
'P Front Panel v volt
rig. Figure Var Variable
< kilo (103) w watt
ww Wirewound
q or meg mega (106) or megohms WWVar Wirewound Variable
n milli (10-3)
!ffg. Manufacturer XlS Xl Output Volts Switch
*il. No. Military Type Number XLOS X10 output Volts Switch
S Mylar XlOOS Xl00 Output Volts Switch

TABLE 1. Abbreviations and Symbols.




6-l
1264R
REPLACEABLEPARTS MODEL 240 VOLTAGE SUPPLY


MODEL 240 REPLACEABLEPARTS LIST
(Refer to Schematic Diagram 12282D for circui,t designations.)

CAPACITORS

Circuit iwz. Mfg. Keithley
Desig. Value Rating TYPO Code Part No. Part No. LOC.

Cl01 20 &If 600 v ETB 00656 PRS C35-20M PC
Cl02 2 Pf 3000 v MY 99120 LK30-205 C53-2M C
Cl03 20 vf 450 v ETB 56289 TVA1709 C8-20M PC
Cl04 .02 kf 1000 " CerD 72982 841Z5V203P C22-.02M PC
Cl05 .02 pf 1000 " CerD 72982 841Z5V203P C22-.02M PC

Cl06 .02 pf 1000 v CerD 72982 841Z5V203P c22-.02M PC
Cl07 .Ol IJ.f 1000 " CerD 72982 811Z5VlO3P C22-.OlM PC
Cl08 .02 pf 1000 " CerD 72982 841Z5V203P C22-.02M PC
Cl09 .Ol pf 1000 v CerD 79282 811Z5V103P C22-.OlM PC
Cl10 .22 I.rf 1000 " MY 99120 LT15-47 C54-.22M PC

Cl11 .02 iJf 1000 v CerD 72982 841Z5V203P C22-.02M PC
Cl12 .033 ilf 1600 v MP 14655 MGT-S33 C43-.033M PC
Cl13 Not Used
Cl14 Not Used
Cl15 .033 Ilf 1600 v MP 14655 MGT-S33 C43-0.033M PC

Cl16 470 pf 1000 v CerD 72982 831Z5V471P C22-470P PC

Cl66 470 pf 1000 v CerD 72982 831Z5V471P C22-470P PC

DIODES

Circuit Mfg. Keithley
Desig. TYPO Number Code Part No. LOC.


DlOl Selenium PT065 81483 RF-18 PC
D102 Selenium PT065 81483 RF-18 PC
D103 Selenium PT065 81483 RF-18 PC
D104 Selenium PT065 81483 RF-18 PC
D105 Selenium PT065 81483 RF-18 PC

D106 Selenium PT065 81483 RF-18 PC
D107 Selenium PT065 81483 RF-18 PC
D108 Selenium PT065 81483 RF-18 PC
D109 Selenium PT065 81483 RF-18 PC
DllO Selenium PT065 81483 RF-18 PC

Dlll Selenium PT065 81483 RF-18 PC
D112 Selenium PT065 81483 RF-18 PC
Dl13 Selenium PT065 81483 RF-18 PC
D114 Seleriium PT065 81483 RF-18 PC
D115 Silicon lN3256 02735 RF-22 PC
D116 Not Used
D117 Silicon lN3256 02735 RF-22 PC

6-2 1264R
MODEL 240 VOLTAGE SUPPLY REPLACEABLEPARTS

MISCELLANEOUSPARTS

Circuit Mfg. Keithley
Desig. Description Code Part No. LOC.
DSl Bulb, ON
Lamp, POWER (Mfg. No. 47) 08804 PL-4 FP
--_ Pilot Light Assembly (Mfg. No. 81410-233) 72619 PL-5
--- Pilot Light Lens (Mfg. No. 233) 72619 PL-5G
DS2 Bulb, Lamp, OVERLOAD(Mfg. No. 47) 08804 PL-4 FP
--- Pilot Light Assembly (Mfg. No. 81410-231) 72619 PL-5
--- Pilot Light Lens (Mfg. No. 231) 72619 PL-5R
FL (110~) Fuse, slow blow, 1 amp (Mfg. Type MDL) 71400 FU-10
Fl (220~) Fuse, slow blow, 0.5 amp (Mfg. Type MDL) 71400 FU-4
--- Fuse Holder (Mfg. No. 342012) 75915 FH-3 RP
31 Receptacle, uhf, OUTPUT, Mil. No. SO-239A
(Mfg. No. 6804) 91737 CS-64 FP
--- Dust Cap for Jl,Mil. No. Mx-913/U (Mfg.
No. 7901) 91737 CAP-4 FP
--- (F) Plug, uhf, Mate of Jl, Mil, No. 49190 (Mfg.
No. 83-822) 02660 cs-49
--- (F) Reducing Adapter, uhf, Mil. No. UG-175/U
(Mfg. No. 83-185) 02660 CS-36

Kl Relay 80164 RL-6 PC
K2 Relay 80164 RL-5 PC
Pl Cord Set, 6 feat (Mfg. No. 4638-13) 93656 co-5 RP
--- Cable Clamp (Mf!g. 'No. SR-5P-1) 28520 cc-4
Sl Toggle Switch, SPST, POWER (Mfg. No.
ON
20994LH) 04009 SW-4 FP
s2 Rotary Switch less components, OUTPUT 80164 SW-27 FP
--- Knob, Output Switch 80164 14838A FP
s3 Rotary Switch less components, OUTPUTVOLTS
x100 80164 SW-28 FP
-__ Rotary Switch with components, OUTPUTVOLTS
Xl00 80164 12565A
--- Knob, x100 Volts 80164 16338A FP

54 Rotary Switch less components, OUTPUTVOLTS
x10 80164 SW-28 FP
-__ Rotary Switch with components, OUTPUTVOLTS
x10 80164 12564A
--- Knob, X10 Volts 80164 16338A FP
s5 Rotary Switch less components, OUTPUTVOLTS
Xl 80164 SW-28 FP
-_- Rotary Switch with components, OUTPUTVOLTS
Xl 80164 12563A
--- Knob, xl volts 80164 16338A FP
--- Knob, INCREMENTALVOLTS Control 80164 14838A FP
Tl Transformer 80164 TR-29 c
$;;5Frnished Accessory
6-3
REPLACEABLEPARTS MODEL 240 VOLTAGE SUPPLY


RESISTORS

Circuit Mfg. Mfg. Keithley
Desig. Value Rating TYPO Code Part No. Part No. LOC.
RlOl 1 kn lO%, 1 w Comp 01121 GB R2-1K PC
R102 5 kn 3%, 25 w ww 91637 RH-25 R45-5K PC
R103 470 kn lO%, 1 w camp 01121 GB R2-4JOK PC
R104 8.2 ka lO%, 2 w Comp 01121 HB R3-8.2K PC
R105 5 kc1 l%, 5 w ww 91637 RS-5 R4A-5K PC

R106 80 kn l%, 10 w ww 91637 RS-10 R30A-80K PC
R107 80 kn l%, 10 w ww 91637 RS-10 R30A-80K PC
R108 8.2 ks2 lO%, 2 w Comp 01121 HB R3-8.2K PC
R109 10 ksl e
l/,, 5 w ww 44655 4654 R4A-1OK PC
RllO 333 kn l%, 1 w DCb 91637 DC-1 R13-333K PC
Rlll 333 ul l%, 1 w DCb 91637 DC-l R13-333K PC
RlL2 333 kn L%, 1 w DCb 91637 DC-L R13-333K PC
R113 120 kn l%, l/2 w DCb 79727 CFE-15 R12-120K PC
R114 312 ki2 l%, lJ2 w DCb 79727 CFE-15 RlZ-312K PC
R115 100 ks2 l%, l/2 w DCb 79727 CFE-15 RlZ-1001~ PC

R116 100 kn lO%, 3 w CbVar 97979 RA104llS RP15-1OOK RP
X117 180 kcl L%, L/2 w DCb 19721 CFE-15 R12-180K PC
R118 5 kn l%, l/2 w DCb 79727 CFE-15 RL2-SK PC
R119 Not Used
R120 Not Used

R121 5m l%, l/2 w DCb 79727 CFE-15 R12-5M PC
R122 1.667 LQ l%, l/2 w DCb 79727 CFE-15 ~R12-1.667M PC
R123 700 kn I.%, l/2 w DCb 79727 CFE-15 R12- JOOK PC
R124 Not Used
R125 33.3 ki2 l%, l/2 w DCb 79727 CFE-15 R12-120K PC

Rl26 Not Used
R127 70 kn lO%, 4 w wwvar 37942 M70MPK RPl-70K PC
R128 220 kn lO%, 1 w 01121 GB R2- 2.20K OS
R129 1m l%, l/2 w DCb' 79727 CFE-15 RL2-1M XlOOS
RL30 1X? l%, l/2 w DCb 79727 CFE-15 RlZ-1M XlOOS

R131 l%, l/Z w DCb 79721 CFE-1.5 R12-LM XlOOS
R132 l%, l/2 w DCb 79727 CFE-15 Rl2-1M XLOOS
R133 l%, 112 w DCb 79727 CFE-15 R12-1M XLOOS
R134 l%, l/2 w DCb 79727 CFE-15 R12-1M XlOOS
R135 l%, 112 w DCb 79727 CFE-15 RlZ-1M XlOOS

R136 1Kl l%, l/2 w DCb 79727 CFE-15 R12-1M x100,5
R137 1m l%, 112 w DCb 79727 CFE-15 RlZ-1M XlOOIj
R138 600 kn l%, 112 w DCb 79727 CFE-15 R12-600K PC
R139 100 kn l%, L/2 w DCb 79727 CFE-15 R12-100K XlOS
R14C 100 kn l%, l/2 w DCb 79727 CFE-15 RL2-100K XlOS




6-4 1264R
MODEL 240 VOLTAGE SUPPLY REPLACEABLEPARTS


RESISTORS (Cont'd)

Circuit Mfg. Mfg. Keithley
Desig. Value Rating TYPO Code Part No. Part No. LOC.

Rl41 100 kn l%, l/2 w DCb 79727 CFE-15 RlZ-100K XlOS
R142 100 kn l%, l/2 w DCb 79727 CFE-15 R12-100K XlOS
R143 100 kn l%, l/2 w DCb 79727 CFE-15 RlZ-100K XlOS
R144 100 kn l%, l/2 w DCb 79727 CFE-15 R12-100K XlOS
R145 100 ki2 l%, L/2 w DCb 79727 CFE-15 R12-100K XlOS
R146 100 kQ l%, l/2 w DCb 79727 CFE-15 R12-100K XlOS
RL47 100 kn l%, l/2 w DCb 79727 CFE-15 RL2-LOOK XlOS
R148 9~800 kn l%, l/2 w DCb 79727 CFE-15 RlZ-800K PC
R149 10 kfl l%, l/2 w DCb 79727 CFE-15 Rl2-800K XlS
R150 10 kn l%, l/2 w DCb 79727 CFE-15 R12-800K XlS
R151 10 kn l%, l/2 w DCb 79727 CFE-15 R12-800K XlS
R152 10 kn l%, l/2 w DCb 79727 CFE-15 RlZ-800K XlS
R153 10 kn 1%, l/2 w DCb 79727 WE-15 R12-800K XlS
R154 10 kn l%, l/2 w DCb 79727 CFE-15 R12-800K XlS
R155 10 kfi l%, l/2 w DCb 79727 CFE-15 RlZ-800K XlS

R156 10 kn l%, l/2 w DCb 79727 CFE-15 RlZ-800K XlS
R157 LO kn l%, l/2 w DCb 79727 CFE-15 RlZ-800K XlS
Rl58 15 kn 5%, 2 w wwvar 12697 43C2-15K RP19-15K FP
R159 1 ka lO%, L/2 w camp 01121 EB Rl-1K PC
R160 *3 n l%, 5 w ww 91637 RS-5 R4A-3 C

RL61 100 kn l%, 5 w ww 91637 RS-5 R4A-LOO PC
R162 .500 kn l%, 5 w ww 91637 RS-5 R4A-500 PC

VACUUMTUBES

Circuit mfg. Keithley
Desig. Number Code Part No. LOC.

Vl OB2 02735 EV-OB2 PC
v2 6~~6 00011 EV-6~~6 PC
v3 6BG6 85599 EV-6BG6GA C
v4 6BG6 85599 EV-6BG6GA C
v5 6BG6 85599 EV-6BG6GA C

V6 OA2 02735 EV-OA2 PC
v7 OA2 02735 EV-OA2 PC
V8 OB2 02735 EV-OB2 PC
v9 OA2 02735 EV-OA2 PC
VlO OG3 80164 EV-OG3-240 PC

Vll 12AX7 80164 EV-12AX7-240 PC



f< Nominal value, factory set.



1264R 6-5
REPLACEABLEPARTS MODEL 240 VOLTAGE SUPPLY




10011 Sylvania Electric Products, Inc. 71400 Bussmann Mfg. Div. oi
Buffalo Operations of Sylvania McGraw-Edison Co.
Electronic Systems St. Louis, MO.
Buffalo, N. Y.
72619 Dialight Corp.
30656 Aerovox Corp. Brooklyn, N. Y.
New Bedford, Mass.
72982 Erie Technological Products, Inc.
31121 Allen-Bradley Corp. Erie, Pa.
Milwaukee, Wis.
75915 Littelfuse, Inc.
32660 Amphenol-Borg Electronics Corp. Des Plaines, Ill.
Broadview, Chicago, Illinois
79727 Continental-Wirt Electronics Corp
02735 Radio Corp. of America Philadelphia, Pa.
Commercial Receiving Tube and
Semiconductor Division 80164 Keithley Instruments, Inc.
Somerville, N. J. Cleveland, Ohio

04009 Arrow-Hart and Hegeman Electric Co. 81483 International Rectifier Corp.
Hartford, Corm. El Segundo, Calif.

08804 Lamp Metals and Components 85599 Tube Department G. E. Co.
Department G. E. Co. Schenectady, N. Y.
Cleveland, Ohio
91637 Dale Electronics, Inc.
12697 Clarostat Mfg. Co., Inc. Columbus, Nebr.
Dover, N. H.
91737 Gremar Mfg. Co., Inc.
14655 Cornell-Dubilier Electric Corp. Wakefield, Mass.
Newark, N. J.
93656 Electric Cord Co.
28520 Keyman Mfg. Co. Caldwell, N. J.
Kenilworth, N. J.
97979 Reon Resistor Corp.
37942 Mallory, P. R., and Co., Inc. Yonkers, N. Y.
Indianapolis, Ind.
99120 Plastic Capacitors, Inc.
44655 Ohmite Mfg. Co. Chicago, Ill.
Skokie, Ill.

56289 Sprague Electric Co.
North Adams, Mass.

TABLE 2. Code List of Suggested Manufacturers. (Based on Federal Supply Code for
Manufacturers, Cataloging Handbook H&l.)




6-6 1264R
-
"""I.
3k--====------
:--"
-

/




Tt#m" 2.X T ,&-I, ,,,-I, f,,A,

_ __ _ _ -L-
Keithley
part No" Loco
W-7025-2&I Pe