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Peavey power transformer

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  • Peavey power transformer

    I have a Peavey Classic 50 from 1993 and the power transformer is missing. I don't want to modify the amp just fix it. I can't find the plate voltage on any schematics I see online. Can anyone tell me what it is?
    I tried contacting Peavey to no avail.

  • #2
    https://www.mercurymagnetics.com/wp-...s/P-CL50-P.pdf
    Delta blues is showing 332v plate.
    Last edited by mozz; 07-08-2024, 10:28 PM.

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    • #3
      Thank you!

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      • #4
        $250 is a bit steep for this amp IMHO! A Hammond 376X ($175) might be made to work and preserve the look.

        If you just want it functional you could "ghetto in" a couple Antek toroids :
        AS-1T350 (350VAC/ 0.24A and 6.3VAC/6A, $42)
        AN-0222 (22 VAC CT for bias, $13)​

        and maybe drop the B+ down to 320 with a zener. Good luck!​

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        • #5
          You do not have location in your profile, so we don't know what primary voltage you are looking for. Also, you may want to add location info to your profile for future reference.
          "I took a photo of my ohm meter... It didn't help." Enzo 8/20/22

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          • #6
            I was not recommending a Mercury, as i have never used them, i just posted so he would get a idea of the HV. I too would just use a Hammond or similar to get it working again.

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            • #7
              Sorry, I'm in Montreal,Canada. Thanks for your suggestions. I don't want to spend that much for the Mercury but I'll check for the Hammond for sure.

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              • #8
                Something seems odd. I'm wondering if Mercury's transformer could be for another model. Although it is a classic 50, the bias on it is at -27v. It doesn't work with a 330v( approximately) which would put the bias at around -9v. Also the electrolytic capacitors are rated at 500v. Is it possible that they overboost these four el84 to 450v which would make the -27v bias more sense? What are your thoughts?

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                • #9
                  Schematic attached. Right below the power tubes there is a voltage divider, R16 and R18 that knocks down the bias voltage from -27V before it gets to the grids.
                  Also, Peavey biases fairly cold, so the -9V you mentioned probably does not apply.

                  edit: I assumed the -27V was the point they meant with "Raw V-", but it might even come from before that.
                  Attached Files
                  Originally posted by Enzo
                  I have a sign in my shop that says, "Never think up reasons not to check something."


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