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Sunn Concert Bass power transformer specifications?

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  • #16
    Maybe someone took off the RCAs or whatever was there. Can you post a pic of the amp? Especially the inside with the PCBs?

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    • #17
      Sunn Concert Bass Picts

      Click image for larger version

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      Originally posted by spy View Post
      Maybe someone took off the RCAs or whatever was there. Can you post a pic of the amp? Especially the inside with the PCBs?
      Here are two picts if I've done this correctly.

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      • #18
        Click image for larger version

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        Originally posted by SmartAlex View Post
        [ATTACH=CONFIG]18563[/ATTACH][ATTACH=CONFIG]18564[/ATTACH]

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        • #19
          Ok, it's time to replace the power transformer! Anyone can help?
          My last calculations are below,
          Back to the power transformer windings, I measure 36Vac at RED-BLK, 36Vac at GRN-GRN and 44Vac at BRN-YEL. It's pretty weird that there are 44Vac where only 15Vdc are needed from this winding.

          The size of the transformer is pretty large, from the core dimensions (96mm length x 80mm depth x 55mm height), it's around 230W or more depending on the quality of the laminations, so if I'll order a PT with secondaries 36V/1A, 44V/500mA then what left of the power can go to the winding for the power output this means I can have minimum around 36V/5A. By placing a 1 ohm resistor after the bridge CR1 I measure 3A at full power so with 5A secondary I'm just fine.

          Let me know if you agree with my calculations!
          Here's the schematic, Sunn Concert Bass.

          SmartAlex, any luck on finding the schematic of your version?

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          • #20
            No, I never found the schematic for that particular version. The customer was considering selling the amp because it sounded so thin.

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