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  • Peavey power amp

    Need a scem for a Peavey Classic 60 , 6L6 tube power amp---the rack mount guy from the 90s .....anyone have one ?



    yes..i know....just call Peavey....I will try but im usually super busy at work when they are open .

  • #2
    So no one is busy NOW, their email is:

    customerservice@peavey.com
    Education is what you're left with after you have forgotten what you have learned.

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    • #4
      The 60/60 is a different amp.

      Here, try this:
      Attached Files
      Education is what you're left with after you have forgotten what you have learned.

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      • #5
        thanks Enzo !!!!!

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        • #6
          id like to add a bias trim pot to this...so replace R20?

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          • #7
            Peavey Classic Series 60 mono power amp

            https://el34world.com/Forum/index.php?action=dlattach;topic=23490.0;attach=71941

            https://el34world.com/Forum/index.php?topic=23490.0
            It's All Over Now

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            • #8
              Originally posted by Valvehead View Post
              id like to add a bias trim pot to this...so replace R20?
              yes, trim pot in series with some resistor depending on whether the bias should be increased or decreased (similar to the marshall amp)
              It's All Over Now

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              • #9
                It is a voltage divider, and R20 gives you no leverage against R22. Increase R22 to maybe 2.7k first.
                Education is what you're left with after you have forgotten what you have learned.

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                • #10
                  If the quiet current needs to be reduce, the bias voltage should be increase with a higher value R20.
                  If the quiet current needs to be increase, the bias voltage should be reduce with a lower value R20.
                  Less value R22, bias power supply is "hard", so the bias voltage is more stable from the oscillations of the line voltage.
                  It's All Over Now

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                  • #11
                    R22 is only 470 ohms, so changing only the value of R20 has very little effect. If we increase R22 to like 3k, then the changes in R20 make more useful differences.
                    Education is what you're left with after you have forgotten what you have learned.

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                    • #12
                      Originally posted by Valvehead View Post
                      id like to add a bias trim pot to this...so replace R20?
                      https://robrobinette.com/images/Guitar/HowAmpsWork/Voltage_Divider.png
                      It's All Over Now

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