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409, 41x, 42x, 44x, 48x -
14x, 18x, 1801 Nanovoltmeters
15x, 18x Null Detectors/Microvoltmeters
- Keithley Applications
- Posts: 2849
- Joined: June 10th, 2010, 6:22 am
- Country: United States
General Instruments Corp.
And the part number was 955
This was in 1972.
This looks like an analog front end input component. Probably low leakage transistor.
The Model 177DMM was obsolete in 1992. And last repaired in 2000.
Not sure if General Instruments is still in business or has this part.
Hope this helps.
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