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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 and old power tubes etc. posted by razzwill@gmail.com on February 6, 2007 at 20:54:14:
Yes. The bias must be adjusted periodically to compensate for tube aging. Adjust the bias as needed to maintain the recommended setting. Generally the sound quality will degrade to an unacceptable level before the tubes won't bias properly.The difference between 110 or 120 mA and 45 mA suggests that the larger value is for two tubes and the smaller value is for only one tube. It is possible that the amp originally was designed such that the pair of tubes was measured and adjusted as a set and later was modified to allow separate measurement and adjustment of each tube.
The best thing to do is to contact Mike Sanders at Quicksilver and ask him about this.
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Follow Ups
- Re: biasing and old power tubes etc. - beermanpete@socal.rr.com 21:51:17 02/06/07 (1)
- He converted a number of those amps - Frihed89 02:19:58 02/07/07 (0)
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