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12 volts isn't gonna make a huge difference, or at least shouldn't - measure the cathode/grid voltage and see what it is. But if you get decent sound, I'd not worry.
Trace out the BB's wires and see where they go - you can use that to figure out where in the circuit it is.
As long as you're getting a raster on the CRT, you've got the basics and it's just capacitor replacement and checking things out. Don't worry that you're not getting a picture - it's in there you jusdt need to find where it's getting lost.
Seriously, at this point, you're gonna need an oscilloscope (and an isolation tranny to keep from blowing up a scope). With a 'scope, tracing out these issues is really easy and fast - you SEE what stage the video gets lost at, or what the vertical signal looks like, etc. A used one shouldn't be too much, and it pays for itself fast.
You've got a TV set that's got the basics working, it just needs some cap replacement and some targeted diagnostics. But unless something's grossly wrong (and there shouldn't be at this point), you'll get a picture if you just keep at it.
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