[Davala]

I finally got back to working on the Dumont. I had to get the horizontal output section working properly as something was way off after replacing the HOT screen grid resistors. The set was drawing much higher current and the drive control didn't seem to be doing what I thought it should do.

I found R113(Sams) a 680K resistor went nearly open at around 3 megs. Looking at the circuit I don't really understand how the set was working with that resistor so far out of tolerance. With it replaced I have plenty of width and the drive control works as it should. The horizontal output tube seems to be running a heck of a lot cooler. The set is drawing 10 less watts! Yikes..

I'm discovering a few resistors that are slightly out of the 10% tolerance. A couple oddball values that I don't have. I'll have to see if I can cobble up anything I have to give me the correct values.

I decided by ear to tune up the audio IF and detector stages as the TV audio was thin sounding. Heck did I wake the sound up! So much better and louder.

So...... The Dumont is pretty much done except for one major problem that's plagued this set since I started working on it. Excessive B+ in nearly all the circuits(except sweep)

Today I checked the 6AG5 1st video IF plate and screen voltages...... 285 to 290 volts. Holy hell, they should be 120volts! The sams did say that their readings were done with the contrast at 100%. At 100% contrast it was still 200 volts. 80 volts high.
The sync tube plate is 327 volts. 80 volts high. The sync tubes screen was 60 volts, only 10 volts high. The 1st audio IF tube, 6AU6, its plate was about 329. . nearly 80 volts high.

Can someone chime in and let me know how I'm possibly getting such high B+ voltages? The TV works so I know every section is drawing current and the B+ should be near normal. I am getting 450 volts on cathode of the 5U4's, thats only an extra +20Vs to the B+.

With the IF sections having such high plate voltages to get a stable picture I have a super tiny range on the contrast control before loosing sync. Again I know the tubes cuttoffs are all incorrect.

No obvious burned parts and nothing smells too hot. Not sure what resistors to go and check, its just going to take time looking at all the resistors attached to the B+.
It has to be resistors, right? Its all recapped.
Thanks!
Matt Davala