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Tektronix Type 59
400 kHz low-cost amplifier plug-in
Model 59 catalog image

Compatible with 560-series scopes

Produced from 1960 to 1963 (or possibly later)

(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix Type 59 is a 400 kHz amplifier for 560-series scopes. It was introduced in 1960, and at $50 (2015 value: $398) it was the lowest cost model of the 560-series plug-ins.

It does not have a calibrated input attenuator. The Type 59 signal input is a pair of banana plugs.

The manual says

The forward end of the chassis has been left free of circuitry in the anticipation that a user may wish to install additional circuitry to fit the Type 59 module to his own special application.

Key Specifications

Bandwidth 400 kHz
Deflection ~ 1 V/Div
Input impedance 250 kΩ


Documents Referencing 59

(no results)


The Type 59 plug-in contains two tubes, total. Both are 6BA8 pentode/triodes. A triode cathode-follower buffers the input. Next is a differential amplifier made of two pentodes. The remaining triode is used as the trigger pickoff cathode-follower. The heater of tubes are supplied with 6.3 VAC from the mainframe.



Some Parts Used in the 59

Part Part Number(s) Class Description Used in
6BA8 154-0163-00 Vacuum Tube (Triode/Pentode) triode-pentode combo 59 2A61 72 3A72 3A2
6BA8A 154-0163-00 Vacuum Tube (Triode/Pentode) triode-pentode combo 59 3A72 526