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EV sb a760 subwoofer, sm or schematic

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  • EV sb a760 subwoofer, sm or schematic

    Hi, I have to repair the power amp of the subwoofer model sb a760. Someone have the schematic or the service manual? The schemtic of some similar amp would be usefull. It's a class H power amp, with 2SC5200 and 2SA1943 output transistor.

    The faulty is in the base voltage: I have almost the negative rail.

  • #2
    It seems like the Dynacord SUB 800A so I look into other Dynacord class H amplifier and I found that CL1600 is similar. I found a leaky medium power pnp transistor. After replace it the amp did work but after about 30 seconds the output transistor blows up. I hope that's due to the thermal runout, I don't attached the power device to the heatsink. From time to time also best ones do stupid things.

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    • #3
      Oops. Good luck. Hopefully not too much fresh damage.
      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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      • #4
        With new output transistor and the right setting of the idle current the amp works fine.

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