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Fender Dual Showman bias setting

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  • Fender Dual Showman bias setting

    I'm looking for advice on bias setting in Fender Dual Showman ab763 (4x6L6GC). Power supply is 458V. I measured the quiescent current (one valve) - it's 21mA. Shouldn't it be something like 40-50mA? I have -53V on the grid. I cannot see the voltage on the schematic - it something like -52V.

    Mark

  • #2
    Tube amp bias calculator

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    • #3
      Great tool. It looks like 29mA is recommended in this case.

      Mark

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