Charlie, pull out your copy of my TV schematic.
please correct me if im wrong, which i might be, but after intense studing of my vertical section, and that schematic I have drawn some conclusions:
My vertical linerity is sorta bad, and the vertical will shrink after it runs for a little bit. its a slow shrink, kinda like a sunset.
so, It cant be before the vert output tube 6s4, because it would start to roll, or loose sync. The picture stays locked completely.
it HAS to be the output. I did notice that the vertical linarity control is run through the cathode of the output tube 6s4.
well also, if you look there is a little paper wrapped electrolytic 50uf, comming off the same cathode to ground, I got my eyes on that cap.
well, here is where i may be wrong, but there are (2)2.2meg resistors in that circuit, one providing volts to the grid, and another comming off the grid back to ground.
well, that cap could be dried up, and run the bias off, because i think that paper 'lytic works the bias on that tube, (this is where you need your copy). well, to the point:
i think that lytic is dried, so it could throw the bias off, and make the tube run a little hot, and then that would be the source of my linarity problem, because the linarity is controlled through the cathode, and that cap could be gone, throwing off the cathode bias, (hence) the linarity is off.
This is causing the tube to run amped up, and then the 2.2meg resistors are overheating, dropping the volts on my grid causing low output, hence insufficiant vertical deflection. (this is where you correct me if im wrong via schematic
).
I have come up with these conclusions by studying the schematic.
Any opinions, or facts would be considered, im just studing to find out possible problems, and required solutions (replace lytic cap). no ESR meter, too expensive.
Another conclusion I considered, would be the cap breaking down under load, lowering the tubes output.