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In Reply to: RE: How To Bias A Fairchild 255a posted by Zedguy on October 2, 2016 at 12:22:29:
Yes those can take a KT66 because the KT66s draw less filament current than an EL34.When you put KT66s in or 6L6GCs,you need to set the negative bias on pin 5 at about minus 40vdc to 42vdc.If I were you I would change the coupling caps in these amps and put a 1N4007 diode across the selenium if these things weren't done yet.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Edits: 10/02/16
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Follow Ups
- RE: How To Bias A Fairchild 255a - Michael Samra 12:48:11 10/02/16 (6)
- RE: How To Bias A Fairchild 255a - Zedguy 13:00:03 10/02/16 (5)
- RE: How To Bias A Fairchild 255a - Michael Samra 01:47:49 10/04/16 (4)
- RE: How To Bias A Fairchild 255a - Zedguy 09:29:55 10/04/16 (3)
- RE: How To Bias A Fairchild 255a - radioactive 12:49:51 10/04/16 (2)
- RE: How To Bias A Fairchild 255a - Zedguy 14:51:54 10/04/16 (1)
- RE: How To Bias A Fairchild 255a - radioactive 19:19:28 10/04/16 (0)
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