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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: tube/bias adjustment problem? posted by coffeequeen on March 11, 2007 at 15:37:00:
If you didn't allow for around 10 minutes for the tubes to heat up really well, that could account for the tubes not reaching their bias points. Some tubes take quite a bit of time to heat up enough to reach an acceptable bias range.Turning your bias adjustments down before attempting to bias should keep the tubes from cherrying the plates while you wait for them to reach proper temperature. I would make another attempt to bias the tubes while keeping a very close eye on them for glowing plates while they heat up. If any of them start to glow shut her down. But, if they don't get red I would let the amp run for 10 minutes and try again.
As usual, disconnect interconnects, leave speaker cables connected and let them heat up while watching for red plates. Some tubes take longer than others to heat. If that doesn't work out, I would suspect a bias supply problem before multiple bad tubes.
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Follow Ups
- Re: tube/bias adjustment problem? - Catch22 18:30:43 03/11/07 (0)
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