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Tektronix 11B1
50 MHz single timebase
Tektronix 11B1

Compatible with 647 scope

Produced from 1964 to (?)

Manuals – Specifications – Links – Pictures

The Tektronix 11B1 is a single time-base plug-in for the 647 and 647A, specified to trigger at frequencies up to 50 MHz.

It was introduced in 1964.


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The 11B1 uses a 7586 triode to buffer the vertical signal at the input, and then a differential pair of NPN transistors that form a clipping amplifier.

The trigger detection is done by a Tek part number 152-125 tunnel diode, which is a selected TD3A.