975

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

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.

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 Word
#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%	EAGLEJUMP
975-K	1000 Ω	±0.002%	<0.2%	±0.5%	EAGLEKISS
975-L	2000 Ω	±0.002%	<0.2%	±0.5%	EAGLELEAP
975-M	5000 Ω	±0.002%	<0.2%	±0.5%	EAGLEMILK
975-N	10 kΩ	±0.002%	<0.1%	±0.5%	EAGLENULL
975-P	20 kΩ	±0.002%	<0.1%	±0.5%	EAGLEPARK
975-Q	50 KΩ	+0.002%	<0.05%	±0.5%	EAGLEQUAD
975-R	100 KΩ	+0.002%	<0.05%	±0.5%	EAGLERISK

• # Available by request

Links

• Experimenter January 1955 describing Type 970 Series

Photos

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  Mechanical Drawing

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  Power Rating Chart