Sunn 200s bias resistor

[shooter]

these GLs are Cryo'd. Does that change things?

only the diameter of your money roll 
I got to play with cryo's for a living, it is fun to freeze things, shatter roses, hotdogs, etc.  Improving tube performance......
I did freeze a bad tube, but it shattered 

[pbman1953]

Ya, cryo, not for me. I guess my friend fell for that. I do have to say that this pair are very close in matching. Upscale does a good job with that.

[sluckey]

The pot min/max is now -63 to -79. With the Bias Rite I'm getting it to settle around 28 watts

Never got down to your desired 22-23 watts. And when/if you change tubes to another brand you'll need to read this thread in reverse to return the bias circuit to original values.   

[pbman1953]

You have seen a range from 22 but I really wanted mid to high 20's. The next thing this needs is new sockets. All these old amps have  wiggly sockets. If he makes a change I'll deal with it.


Thanks for the help

[sluckey]

You have seen a range from 22 but I really wanted mid to high 20's.

Hmm, in reply #10 you said you wanted 22 to 23 watts. But you never reported you had 22 watts in this entire thread. And you also never said you really wanted mid to hi 20s.

[pbman1953]

I stand corrected i wanted higher in the end