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Got sweep!
Can't believe it, but after studying the schematic, I noticed I left out a 470 ohm 1 watt resistor from pin 9 of the vertical tube socket to ground.
Someone fooled with this set many years back, and replaced a couple of the electrolytics, but never took out the originals...they were all wired in together!
Anyway, when I pulled those caps out, the 470ohm resistor was wired together with a 100uf capacitor, and I just forgot to put it back in.
Now I have sweep, picture looks OK, when I can see it, BUT, I can just make it out...
If I turn up the brightness, the picture goes dark.
If I turn the brightness all the way down, and slowly turn it up about 1/4 of the way, I see a clear bright picture for only a second, then it goes just about completely dark.
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