Quote:
Originally Posted by Radiotronman
I can get the horizontal to hold for only seconds at a time.
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Could you post the schematic covering the video detector and video amp chain?
I'm wondering if there's a chance the vid.detector diode* could be installed backward. There's been a couple of such cases on this forum, and it produces a display very much like what's seen in the screen shot you posted.
*That's assuming it uses a SS diode (1N34 etc.) and not a tube diode (6AL5 etc.)