Are the CTC5 HV supplies weak?

[Penthode]

Originally Posted by miniman82

I’ve tried everything to get move voltage out of my Wingate- I added a HV pot for the shunt tube (didn’t help at all, in fact you can remove the 6BK4 completely and you probably won’t even notice), added a H-drive pot in an attempt to run the horizontal output tube harder (marginal improvement, but still saggy HV on bright scenes), and installed one of those solid state stick rectifiers. Despite all my efforts, I still cannot eclipse 21kv with an image on screen. I still haven’t done the contrast pot mod so that would help a bit, but the main issue is how the FBT is wound.

I went through the same process and wasted a lot of time. I had considered a fly back swap from a later color set.

Did you try the solid state 3A3 replacement? It plugs straight in and boosted the HV to where the 6BK4 actually shunted some current. It regulates now at 21kV better.

But look at the bright side: if the 6BK4 fails, at least you won't be bombarded by XRays!