Vertical size

[timmy]

Is it at all possible to change the resistor value on a vertical size pot either higher or lower value to get alittle more size top and bottom, to open it up alittle more. There is a 100k and .01 cap on the wiper not sure if any of these can increase the size.

[trinescope]

This kind of problem is going to be either low voltage to the oscillator or output stages, or low signal amplitude at the output tube grid. Or less commonly a failed yoke or output transformer. Changing part values most likely won't give you the results you want.

[timmy]

It’s actually a pilot 37 tv electrostatic crt , I have a small crt for it but need very little more vertical size figuring a resistor change may do it.

[Electronic M]

There's probably no harm in trying. If you look at the pot it should be easy to tell it it's set for min or max resistance.