21-CT-55 power supply failure

[miniman82]

Originally Posted by Penthode

Excessive horizontal output tube current can be due to a number of things. Is the horizontal drive correct? Excessive drive will cause excessive current.

Drive is excessive, but I can't figure out why. I can't even get the drive lines to go away with the control and the oscillator tube has incorrect grid voltage as well, not sure where to go with this.

What are the voltages around the tube? What does the horontal linearity look like? Depending how the linearity looks, that will provide a clue(s). How about a picture of a crosshatch pattern on the screen?

Lin is fine, nothing amiss there.

Have you checked and substituted the H O Tube?

2 different ones, it's not the tube.

I am curious you say the EHT (+25,000v) is okay. How much curent is the 6BK4 shunt regulator drawing?

Don't know, when Wayne was here we checked the HV and it was fine. If the shunt were set incorrectly, I would expect it to be much higher, or if it were redplating much lower.