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Tektronix 10A1
Differential amplifier plug-in
Tektronix 10A1

Compatible with 647

Produced from 1965 to (?)

Manuals – Specifications – Links – Pictures

The Tektronix 10A1 is a differential amplifier plug-in for 647 scopes. The input amplifier uses 8056 nuvistor triodes for the input cathode followers. The 10A1 is a comparator, meaning that it has a built-in precision variable DC voltage source that can be added or subtracted from the signal voltage.

The 10A1 was designed by Les Larson.


  • Maximum calibrated sensitivity: 1 mV/div
  • Minimum calibrated sensitivity: 20 V/div
  • Input impedance: 1 MΩ in parallel with 20 pF
  • Frequency response is DC to 45 MHz, except in maximum sensitivity setting, where it is 35 MHz
  • CMRR below 100 kHz is 20,000:1
  • Maximum input current: less than 1 nA
  • Comparison voltage range: -6 V to +6 V
  • Comparison voltage accuracy (0 °C to 40 °C): +/- (0.1% + 5 mV)


Some Parts Used in the 10A1

Part Part Number(s) Class Description Used in
8056 154-0417-00 Vacuum Tube (Triode) low-voltage Nuvistor triode 422 502 W 1S1 3A7 3S3 3T4 5T3 10A1