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previous: F.J.R. In my home-brew AC-30 I'm hitting p... -- 4/30/1999 7:03 PM view thread

Re: Plate voltages on 6BQ5's...

4/30/1999 9:33 PM
Bob S
Re: Plate voltages on 6BQ5's...
If they get too hot they'll just burn up but you shouldn't hurt anything else. Your tube life maybe shorter. That's an awful lot of plate voltage on those tubes. Stock AC-30's run about 330 volts on the plates with about 40 to 45 ma. per tube. To continually run that high of a plate voltage you should reduce screen voltage at pin #9. You might try a 2.7k at the screens. Less voltage there will run the tube cooler, and with that kind of plate voltage you'll need to run them cooler.  
Bob S.

Bruce ANother thing is to measure the pla... -- 5/2/1999 6:37 PM