3A1S

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Template:Plugin Sidebar 2 The Tektronix 3A1S is a vertical plug-in for the 561S.

Key Specifications

Deflection from 10 mV/Div to 10 V/Div (in a 561S)
Bandwidth 25 MHz
Rise time 14 ns
Input impedance 1 MΩ // 47 pF

Internals

The input signal passes through a compensated attenuator switch and then into a 7586 cathode-follower biased with 2 mA plate current.

The gain stages use a mix of transistors and output stage driving the deflection plates is a transistor/pentode cascode circuit with T-coli loading.

The 3A1S is built in traditional ceramic-strip construction.

Pictures