All the components checked out in the vertical amp which got me thinking about Eric's comment to not replace the ceramic and mica caps.
Since the two ceramic tube capacitors were gone when I got this chassis, I didn't have much choice. I went with some 500V micas - maybe that wasn't right?
So I dug out my unrestored VT73 with a TS-4J chassis and pulled out these two capacitors.
Here's the resulting picture after some tweaking of the controls.
Surprising how much of a difference that made! The vertical isn't clipped anymore, but now I've got a "snake" and ghosting. Regardless, it's progress!
Does anyone know what's special about these caps? According to
this great site, the 100pF is +/-10% and the 250pF is +/- 20% both with a temp coeff. of -330 ppm/C.
I would have though that 2% mica caps would be even better?
Unfortunately, I need to put these back where I got them, so I'll dig around my old parts and see if I can find something equivalent.
While taking that photo in total darkness, I noticed the 25L6 driving the flyback glowing blue. Should I be concerned?
