Columbia 817-6

[Doug66]

A fellow member is mailing me a Sams for the set, so I can't do too much until I get it. I did notice that I have no negative grid voltage on the 6BQ6. I should have -8V. I have about -.5

The 82ohm resistor on the grid measures about 95 ohms, so I'm sure it's good,

[Doug66]

Right after my last post, I found part of my voltage problem. Instead of a 6BQ6, there was a 6DQ6 in place. Putting the right tube in gave me the propr negative voltage.

The screen grid voltage is still way off. I should have 150, and I have about 55 volts. The 330V source is only reading about 220V. I'm going to star tracing where the source voltage comes from and see what's wrong.

[Doug66]

Some Success:

I decided to try another damper tube. The one in there was the original CBS. I now have a horizontal line across the screen. Most all the paper caps have been replaced except a couple in the audio section. I'll start tracing the vertical section tomorrow.

[Doug66]

I think I've located my vertical trouble. The primary in the output transformer is open. Does anyone have a Stancor A-8141, Merit A 3039, or Chicago TSO-12 for sale?

Thanks
Doug