Analog oscilloscope repair 3 - Tunnel diodes

Repairing the time base of the Tesla BM556 analog oscilloscope from 1982. Testing some transistors, diodes, resistors and capacitors, talking about in-circuit testing. Finally, the problem turned out to be a germanium tunnel diode GE134. I don't have the exact type, so I went through datasheets of soviet tunnel diodes and chose the most similar one - GI304A.

The 1st episode: https://youtu.be/JYR6D2rZoQE

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