Vertical Issues on a Philco 50-T702

[Crist Rigott]

Guys,

I've created a problem with my 50-T702. The vertical is squashed on the CRT. Let me explain how this happened.

I obtained a HV module from a member on VK and when I installed it, the HV would only adjust to about 3900 volts, not the 4800 I was looking for. When I disconnected the HV wire, then I could get up to 7200 volts. I'm thinking that something is loading down the module. So here is what I did to trouble shoot the issue.
I disconnected the wire at the junction of the pin 9 of the CRT and the end of the Vert. Centering Pot. I got Good HV on the meter. Reconnected the wire.

Then I disconnected the wire going to R52 from the end of the Horiz. Centering Pot. Again I got good HV. Reconnected the wire.

Then I disconnected the wire going to R57 from the Focus Pot. Again the HV was good. Reconnected the wire.

Then I disconnected the wire going to the Vertical Amp circuits from the junction of R57 and R58. The HV was loaded down a bit but I could still adjust the HV to produce 4800 volts. I then reconnected the wire at the junction of R57 and R58.

The HV could only be adjusted to give the 3900 volts again. It looks like something is loading down the HV in the Vertical Amp section. Now with the high oms resistors R58-R60 connected, they did load down the module some, but not enough that I couldn't adjust the voltage back up to 4800 volts. But with these resistors connected and the Vertical Amp section connected, that's where there is too much of a load on the module.

The whole time I was doing this trouble shooting, I didn't look at the picture so I don't know when the picture collapsed. I've included a picture of what it looks like.

I did a very careful visual inspection of the HV circuit along with the Vertical Amp and the Vertical Osc. sections. I also checked each resistor in all 3 circuits and they checked fine. Unfortunately, I have no way to check the caps in those circuits. Those would be the 6KV ones along with the 1.6KV ones. The problem shows up on another CRT too. I know, but what the heck, I tried it just to be sure. I also swapped out the 7F7 V13, and the 12AU7 V7 but the collapsed problem stayed the same.

So any suggestions as to what I could do to further isolate the collapsed problem? Also any ideas as to what to do about the HV module loading down so much I can't get the voltage up to 4800 volts.

I've included a picture of the problem along with the schematic.

Your help is appreciated. Thanks.