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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: GE 6CA7 - Can't bias tube low enough posted by Capt. Z on April 12, 2007 at 04:56:47:
It appears one tube is simply too "hot" to fall within the bias adjustment range of the amp, that's all. There is likely nothing "wrong" with the tube, it just needs a bit more negative voltage on its grid to bring the bias current into spec.You have a couple choices - either make the changes needed to provide the required bias voltage or take that tube out. With those fat bottles being so rare, I'd look seriously at the bias, but that's up to you.
DO NOT throw the tube out or any such thing. It tested well, it behaves well in the amp, it's just a bit too hot for the amp's bias circuitry. Tubes like that pop up all the time. Even if you don't use it in this application you may have use for it in others.
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Follow Ups
- Re: GE 6CA7 - Can't bias tube low enough - Jim McShane 06:18:54 04/13/07 (3)
- Re: GE 6CA7 - Can't bias tube low enough - Capt. Z 06:57:43 04/13/07 (2)
- Re: GE 6CA7 - Can't bias tube low enough - Jim McShane 08:31:58 04/13/07 (1)
- Re: GE 6CA7 - Can't bias tube low enough - Capt. Z 09:05:40 04/13/07 (0)
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