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OK, I'm going nuts. I'm focusing on V9 the 6AU6 sync separator and restore tube.
I disconnected everything from the plate except the 220K resistor going to B+
Video in on the grid is pretty clean. Cathode is clean. b+ IS CLEAN.
A few seconds after power-up, there is a 50 Vpp sine wave that slowly gives way to a mix of video and sinewave.
I've swapped out the tube several times. No change.
I examined the socket for any solder splashes or carbon tracks.
I'm going to dig up a NOS socket, build the circuit using all new parts, disconnect the old socket and wire it in. I'll just leave it unmounted until this is resolved.
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