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Tektronix 3A7
Differential amplifier
3A7 front view

Compatible with 560-series scopes

Produced from 1966 to 1974

Manuals – Specifications – Links – Pictures

The Tektronix 3A7 "Differential Comparator" is a differential amplifier plug-in for 560-series scopes. It provides a precision variable DC source, allowing an input signal to be shifted by a specific voltage offset.


Bandwidth 10 MHz in 10 mV/DIV and above, 8 MHz at 5 mV/Div, 6 MHz at 2 mV/Div, 4 MHz at 1 mV/Div
Deflection 1 mV/Div to 50 mV/Div (1-2-5), variable control up to 125 mV/Div, separate 1-10-100-1000× attenuator, i.e. up to 50(125) V/Div
Display modes A -  Vc, A - B,  Vc - B
Comparison voltage 0 to ±1.1 V or 0 to ±10 V, 10 coarse steps plus 10-turn pot with mechanical readout