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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: Re: Which are the best 7868 tubes? posted by Mechans on April 16, 2007 at 16:44:00:
The S-5500 II uses 150K grid resistors, so you are fine there even if they drifted up 20%.But you need WELL matched tubes (NOS or current production makes no difference) since there is only one bias adjustment for all four tubes. One tube that was running too hot or such could result in an early demise of that particular tube. That may well be what happened. If the tubes you had were distributor matched then I can almost guarantee they weren't well matched.
A leaky coupling cap could be at fault too, if they are original they need to be replaced. Be sure the bias circuit is healthy too.
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Follow Ups
- Re: Which are the best 7868 tubes? - Jim McShane 20:26:56 04/16/07 (0)
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