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Tektronix TU-4
Mainframe testing plug-in
TU-4 front

Compatible with 560-series scopes

Produced from (?) to (?)

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

The Tektronix TU-4 is a plug-in for testing 560-series oscilloscope mainframes. It contains load resistors for testing the power supplies of the scope. It has an Y-input for driving the vertical deflection, and it has a Z-input for testing the Z-axis function in the CRT circuit.