The General Radio 975 Potentiometer Series was introduced in Catalog O (1956) and remained available through Catalog 1973.

General Radio 975
Potentiometer Series
General Radio 975 Potentiometer Series

Available from 1956 to 1973

Manuals
Catalog History
 Document Year Page
Catalog O 1956 232
Catalog P 1959 231
Catalog Q 1961 232
Catalog R 1963 202
Catalog S 1965 250
Catalog T 1968 262
Catalog U 1970 293
Catalog73 1973 337
(All manuals in PDF format unless noted otherwise)

The Type 975 is part of the 970 Series of general purpose potentiometers. They are useful for dc, throughout the audio and ultrasonic-frequency ranges. They have the ability to be stacked while using a common ⅜ inch shaft. Stacking requires hardware that's not included. Mounting is by three 6-32 supplied screws. The basic power rating for the Type 975 is 10 watts. The 975 Series replaced the Type 214-A Series of potentiometers. The recommended dial plate is the Type 970-P2.

Specifications

  • Effective Electrical Rotation: 320° ±2°
  • Total Mechanical Rotation: 330° ± 5°
  • Average Torque: 4 oz/in.
  • Power Rating: panel mounted 13.4 w, suspended in air 10.7 w, see the power rating chart below


Type 975 Series of Potentiometers
Type Resistance Temperature
Coefficient
Resolution Independant
Linearity
Code
#975-D 10 Ω +0.07% <0.5% ±1%
#975-E 20 Ω +0.07% <0.5% ±1%
#975-F 50 Ω ±0.002% <0.5% ±1%
#975-G 100 Ω ±0.002% <0.5% ±1%
#975-H 200 Ω ±0.002% <0.5% ±1%
975-J 500 Ω ±0.002% <0.2% ±0.5% 0975·9710
975-K 1000 Ω ±0.002% <0.2% ±0.5% 0975·9711
975-L 2000 Ω ±0.002% <0.2% ±0.5% 0975·9712
975-M 5000 Ω ±0.002% <0.2% ±0.5% 0975·9713
975-N 10 kΩ ±0.002% <0.1% ±0.5% 0975·9714
975-P 20 kΩ ±0.002% <0.1% ±0.5% 0975·9716
975-Q 50 KΩ +0.002% <0.05% ±0.5% 0975·9717
975-R 100 KΩ +0.002% <0.05% ±0.5% 0975·9718
  • # Available by request

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