Quote:
Originally Posted by Kevin Kuehn
I think I would go back to the B&K Analyst and see if there's something obviously different about the way the 60hz is riding on the video and sync. The fact that the wave clears up with the vertical synced to the AC line is a significant clue to finding the cause.
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It's not cleared up, it's just stationary.
Quote:
Originally Posted by Yamamaya42
perhaps so but it does not have to be much to cause a problem, it's kind of odd that it goes away the sec you switch it off, and the heaters are still warm enough to work and there it still enough power in the caps to run for a brief sec or two.
It's less likely to be a bad rectifier or something like that. cause i'm sure you checked.
I'm just trying to think of a possible path, this is a VERY odd problem. :O
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Well, the instant power is turned off, there's no more 60Hz AC coursing through everything. So I would expect it to go away.
What's killing me is that nothing I've tried has had any significant impact. H-K leakage on the video amp or sync tube seems the most likely to me. So would a bad ground connection. Or could it be something stupid like the big wirewound filament dropper resistor radiating 60Hz ?