Bell and Howell Model 34 Oscilloscope

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Bell and Howell Model 34 Oscilloscope

Post by CHUCKSUE on Tue Feb 10, 2015 2:15 pm

I have started to repair this scope. I can put a signal to the vertical input and see a sign wave on the CRT. I see this only if the sync control is turned all the way clockwise. When I start to turn the sync to the left I loose the waveform at about three o'clock . I have the schematic and the sync control comes off the plates of the 12BH7.
All the other controls seem to work fine. When I loose the waveform I get a vertical line?????

CHUCKSUE
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