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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Biasing Fisher amp - can anyone shed light on this? posted by PeterI on March 11, 2007 at 21:41:04:
If you're using the amp alone, you need to add a 240 Ohm 10W (I'd use 25W) resistor to sub for the preamp tube heaters that were powered from the 5751 cathodes. Bias is adjusted for 33V at the 7591 cathodes. I'd leave the AC balance alone (actually I wouldn't, but I have a basement full of test equipment).
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Follow Ups
- Re: Biasing Fisher amp - can anyone shed light on this? - Tom Bavis 13:27:24 03/12/07 (5)
- Do I put that resistor in the circuit to ground? Did you mean 7591's? - PeterI 10:32:22 03/13/07 (3)
- Re: Do I put that resistor in the circuit to ground? Did you mean 7591's? - Tom Bavis 11:25:29 03/13/07 (2)
- Thanks again. - PeterI 14:35:24 03/13/07 (1)
- Any suggestions about upgrading this amp welcome (nt) - PeterI 21:05:41 03/13/07 (0)
- Thanks you ... - PeterI 20:07:58 03/12/07 (0)
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