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Thanks for the suggestions!
I forgot to mention some things earlier. First, the waveform coming into the control grids of the horizontal output tube pair is stable, which leads me to believe it's the outputs tubes, not the oscillator or hold controls at fault. The service manual says that the horizontal drive control adjusts the amplitude of the sweep applied to the output tubes' control grids, so I think it's stable too, but I'll clean it to be safe.
I also did some tapping around as per OC's suggestion, and the line seems to jump in severity when I get to V24, which is the same horizontal output tube which read a little leaky on the tube tester when I tapped on it during test.
So I guess I'm off to search for a new 6BQ6 or two. I'm sure I'll find one.
And John, I replaced the old integrator with an almost equally old one I found in my big random tube gear parts box. The old one had an output of about 1.2mV, and the new one is a little higher, which helped out the vertical hold a little bit. My bigger problem there is an AC hum ripple in the signal causing it to fall in and out of vertical sync, but I'm replacing that faulty cap today.
And oh yes, the cat's name is Cookie. Better pic posted.
–Tom
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