Mighty Monarch of The Air

[old_coot88]

Originally Posted by VintagePC

That could well do it!

Considering C61 is part of what comes out of the 1x2 cap -> through a transformer.

That means without C61, your flyback won't operate properly.

I'd connect it in the same way as C62 - using the optional 255V connection.

If C61 was indeed missing, it'll be interesting to see what happens when he replaces it, since it is the bypass/'filter' for the bootstrapped (B boost) voltage. Since the vertical oscillator is supplied from B boost, the absence of C61 was probably introducing some wonkiness into the vertical waveform too.

What still puzzles me is- he was drawing a healthy 'air arc' off the plate connector of the 1X2. Assuming the replacement 1X2 is good, there should definitely be adequate HV coming out of it.. assuming there is no short to ground. One remaining possibility is that the second 1X2 is gassy. So one question- is the 1X2 getting hot after a few minutes of running? If it's hot, like too hot to touch, it would indicate the tube's gassy (even though it might still test good on a tester).