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Re: check your power tubes

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I would examine the tube or tubes in question as per Ralph's suggestion. You might want to check out the Atma-sphere website for a guide on how to visually examine the power tubes for flaws. As a precaution, I would visually inspect all 8 powertubes in the problematic amp. If one or more of them fails and you still keep the bias setting at 550ma, you are forcing the remaining good tubes to work too hard, thus worsening the issue with further tube failure. If all tubes 'appear' fine, and the issue is with the socket, then in the short term, you can simply set the bias setting at 480ma (7/8x550)and be good to go.

On a separate note, if you retubed everyuthing recently, it might be a good idea to check out all 16 powertubes anyway, since serious flaws would likely show up soon after being pressed into service.


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  • Re: check your power tubes - 'tsup 05:40:42 07/20/05 (1)


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