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previous: Bruce Beam forming tubes don't seem to ne... -- 6/5/2000 7:36 AM View Thread

Re: Runaway Bias

6/5/2000 11:42 AM
Peter S
Re: Runaway Bias
I think you need to look at your bias resistors. I havent used 6550's in a while, but it seems that at 535Volts the -40 isnt negative enough. I know for sure that it isnt for almost any 6L6GC tube. I had a pair of Sveltana 6L6GC's yesterday running at 450Volts and I had to put  
-56vdc on pin 5 to get them to run at around 35ma.  
Peter S  
Kimerik Amplifiers

Richie{~}==::: I agree.. around -55 to -60 shoul... -- 6/5/2000 2:11 PM