[Penthode]

Thanks for the response. Certainly, I shall share my current woe.

Fired up the set and checked basic voltages which appeared okay. I noticed the HO Tube began to red plate after a few minutes and there was no HV. Checked the H Oscillator and it was spot on frequency and amplitude to the HO Tube was correct and the HO Tube bias was about -60volts.

I loosely coupled the scope to the HO Tube plate and saw a good spike. Removing the HV rectifier cap, I could draw only a small arc. I tried disconnecting the various things that might load the transformer such as the convergence assembly, the yoke horizontal coil and the HV would not rise.

I measured the DC voltages on the plate and cathode of the damper and they were the same and there is no boost B plus. Incidently, I removed the regulator cap to ensure it wasn't loading down the HV.

I finally did some resistance measurements and see there is about a 500k ohm resistance from the HV windings to ground. There should be no leakage from this winding to ground unless there has been a breakdown through the transformer frame itself.

Funny as I tried ringing the coil earlier and it seemed okay. It looks like it will breakdown when powered up.

All thoughts are welcome but it looks like the HO Transformer to me.