Quote:
Originally Posted by bandersen
The issue seems to be isolated to the detector / video amp / sync separator.
I recall there's an old trick to reduce hum in a 6AL5 by running the filament lean. I'll give that a try.
I also noticed that the instant I turn off power, I get a perfect test pattern grid before it fades away.
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Along those lines you could try adjusting the lower video frequency response. But it may be a band-aid.
Checked for 60 hz on the DC restorer voltage feeding the grid?