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Tektronix 3A1
Dual trace amplifier plugin
Type 3A1 front view

Compatible with 560-series scopes

Produced from 1962 to 1968


Manuals – Specifications – Links – Pictures

The Tektronix Type 3A1 is a 10 MHz dual-trace amplifier plug-in for 560-series scopes, introduced in 1962.

Key Specifications

Bandwidth 10 MHz
Risetime 35 ns
Deflection 10 mV/div to 10 V/div, 1−2−5 sequence
Input impedance 1 MΩ // 47 pF


The input signal passes through compensated attenuators and then into a cathode-follower stage made of two 7586 Nuvistor tubes.

Channel switching in ALTERNATE mode is done using diodes. The output stage that drives the vertical deflection plates of the scope uses a pair of 8233 frame grid power pentode tubes.