1966 GE PortaColor Restoration

[old_coot88]

Originally Posted by Dubis7

I'm still wondering about whether the thermistor is dropping enough. Let's say I were to jumper it with a wire, just to see what would happen with zero resistance. Would I be risking causing any damage?

Well, you'd be applying full Boost voltage directly to the plate of the vert osc with the Height control at full rotation, which wouldn't be good.

First, verify that there is Boost at the height control. If there is, try subbbing in a few resistors for the thermistor. I'd try something like 22K, 47K, 100K, 470K, 1 meg. If there's no improvement in the height, then the thermistor's not the problem.

(A decade box for R substitution would be handy.)