7” electrostatic set deflection shortcomings

[CJVx]

Has anyone else experienced short vertical height, only to fold over and crowd past a certain level, and not enough horizontal width, again with crowding past a certain level? Currently working on a Halicrafters and a Tele-Tone. And they both exhibit the same symptoms. The only 7 inch set that seemed to have enough to fill the screen was a Motorola VT71 that I worked on.

Anyway, I have gone through both sets, caps replaced, verified and replaced some tubes, verified filament voltage is correct in the stings etc. Checked all and replaced most resistors in the vertical and horizontal circuits with some improvement, but still not able to stretch the picture fully across the screen. If I lower the HV, this will enable me to accomplish that but now I’m only down to about 3kv and picture quality suffers.

On a variac, the picture doesn’t actually start to shrink until I lower the voltage below 90, and I don’t get any extra picture expansion if I temporarily crank it to 130 V. I do gain some brightness though.