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Well today I turned the Philco on and had the white and green picture again, so I pulled the crystal off a NOS chromacolor II era Zenith board I had, put it in the Philco. I still had the green and white, then I tried exhcanging the 6GH8 (even though the one in there tested good), no difference.
Next I put 3 24pf caps in series to get 8pf to ground from pin 1 of the 6GH8 (the plate of the chroma reference oscillator control) and it worked. As soon as I disconnected the caps from ground, it ceased to work. I tried this several times over a period of about 10 minutes and it was always the same.
But like I said before with 1 24pf cap it had no color sync. With 2 24pf caps in series it was not consitent, sometimes good color, sometimes no color sync.
Next I'll pick up an 8pf cap and solder it in permanently and see what happens.
This has to be the strangest tv problem I've come across yet....
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