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  1. C

    k66 in a mark IV

    Well… I think that answers that question. Thanks for the help and information, much appreciated. I guess I’ll post the next question concerning another possible choice, tung sol 5881 (same amp), any thoughts? Thanks again
  2. C

    k66 in a mark IV

    Can anyone comment on the advisability of using a k66 tubes in a mark IV. Any safety or compatibility issues/ What about the tonal results?
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