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Is your circuit board designation marked as 8GC7? If not it's possible the previous owner was following the wrong schematic. I have two 1077 schematics here and on the 8GC7 version it does not use the JK flip flop. There's a possibility that there are revisions of this devise we're not aware of. Otherwise for loss of vertical check the 50uf cap on the cathode of V1B vertical output. Other than that you pretty much have to get in there with a scope and see where you're loosing your vertical waveform amplitude.
Last edited by Kevin Kuehn; 02-22-2020 at 07:33 PM.
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