Vertical Issues on a Philco 50-T702

[Crist Rigott]

Well I have a collapsed picture again. I think it was a result of installing a solid state HV supply. When I installed it I was tweaking the voltage pot and it was changing the voltage but my HV meter was in error and was reporting the voltages too low, hence I went pretty high (my guess over the 6KV rating for the caps).

Earlier I had the same problem and replaced C82.

I now have a reliable HV meter so I can adjust the HV to about 4800v.

I clipped in another .0047 6KV cap for a substitute for C82 but that didn't work this time. I did the same thing for C81, C93 and C94.

I measured the voltages on V13 and on pin 3 I get 14V instead of 235V, pin 4 I get -.06V instead of -.6V, pin 5 I get -4.5V instead of .1V, and pin 6 I get 110V instead of 470V.

I get a very good picture and can make all the adjustments but the picture is only about 1/3 to 1/2 high.

In post #1 I attached a schematic of the Vertical section.

I feel I'm chasing my tail on this one. I'm sure once I get this problem licked, I'll have a great little TV with no HV collapse.

Thanks.