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  1. F

    Newbie with a bias question, 1989 .50 Caliber

    Had the customer pick up a set of Mesa tubes form the local Mesa dealer. Sent them back!! One running at 32 ma the the at 17ma/ So much for their computer matching!! Nothing wrong with the amp. Swapped the tubes around and the results were the same for the tubes again! May be back to Bob at...
  2. F

    Newbie with a bias question, 1989 .50 Caliber

    I think I will call Eurotube and get a set biased hotter. This circuit is a pain as you say!! Designed to sell Mesa tubes.
  3. F

    Newbie with a bias question, 1989 .50 Caliber

    Hi to all! I have a .50 caliber in with heavy crossover distortion. The tubes in it were Groove tubes. The pair look and test excellent on my Hickock Mutual Trans tester. They are running about 5 ma at idle! Put in a pair of JJ Telsa 6L6GC (and I know they always run a bit cold) and got up...
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