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Tektronix Type 3A3
Dual trace differential amplifier plugin
Type 3A3 front view (SN 4990 up)

Compatible with 560-series scopes

Produced from 1964 to 1972

Manuals – Specifications – Links – Pictures

The Tektronix 3A3 is a dual trace differential amplifier for 560-series scopes. It was designed by Roy Hayes.


Bandwidth 500 kHz or 5 kHz (switch-selectable)
Deflection 0.1 mV/Div to 10 V/Div, 1−2−5
Input impedance 1 MΩ // 47 pF


Early 3A3s use a 7586 Nuvistor for the front end cathode follower. Serial numbers 4990 and up use a dual JFET.


Older version (below SN 4990, Nuvistor in input stage)

Newer version (from SN 4990 up, FET in input stage)