5C3: How to balance paraphase inverter?

[Cygnus X1]

Well, now I have two problems.

The only set of 6V6's it "likes" are an old set of Sylvania 6V6GT's. But they are red plating, and I can't see where all the current is coming from. 385 on the plates, 21V on the grid. I suppose I have to play with the 250 ohm power resistor to get the current down. But, it sounds best this way. (for now-it might last a week if I'm lucky).

Other-very odd opportunity (problem):

The tone control shows bad distortion on anything but full up, or full off. Within the sweepe, the distortion is worst at midpoint on the pot. I thought it could be bad pot, bad caps.
So I changed everything, both caps and the pot. No change. What should I look for? The 50uf caps?
Bad karma in V1? (Yes, I tried several different 6SC7's-I now have a set of Tung Sol JAN glass 6SC7's in there).

This amp is far too much fun for my abilities.
(Note sarcasm).
Any help with that tone control distortion would be greatly appreciated. I can find my way around the bias issue-I hope.

[Andy Le Blanc]

Tube have a max plate dissipation in watts. Put a 1 ohm resistor between
the cathode resistor and ground and measure the draw in milliamps,
convert to amps (I) by moving the decimal three places to the left,
multiply by the plate voltage to get watts, then divide by two to get the static plate
dissipation for one tube. Dont exceed the published max plate dissipation.
Youll need a few choices for the bias resistor between 300 and 500 ohms.
Take care of the power side (bias) first, then worry about the other issues.

[Cygnus X1]

Good grief.

Next time remind me to post a detailed
pic of my build before I start shooting off
questions.

Part of the Grommes build was to have the #5
pins of the 6V6's tied together.

Guess who forgot to remove that wire!
Works fine now-all problems solved.
Sounds awesome!

[Andy Le Blanc]

ooops......... you found it, good job.