CTC 5 Low high voltage

[Penthode]

Originally Posted by oldtvsandtoy

Ok I got around to checking the horz output tube. Here is what I found. With top cap off and tube removed, I get 416vdc at the cap.
pins 1 & 8 190vdc
pins 2 & 7 6.3vdc
pins 3 & 6 8.7vdc
Pins 4 & 5 -20.5vdc
Well 4 & 5 dont look right should be -40vdc So what do you think now?

Pins 2 to 7 should be 6.3 vac of course.

Pins 4 and 5 are the control grid. Without a scope it is hard to guess. But the bias is developed by the grid rectification and only -20vdc implies you are not getting sufficient horizontal drive or else the coupling capacitor is leaky.

Then again, you may not be getting sufficient horizontal drive. A scope would sure help the diagnosis process.