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Hartke A70 Bass Amp troubleshoot

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  • #31
    Originally posted by Fabrizio View Post

    But: At J10a (Speacker connection) I have 44 V across + and -.
    Not clear. Is the output DCV positive or negative wrt amp ground?


    I checked transformer and I have +34v from black to blue1 and +34v from black to blue2.
    Why +34V? Should be ACV.


    Voltage at D12 is +44.8v and at D13 is -44.8v. So it looks like the main rails are OK , I believe?
    Supply looks good.

    - Own Opinions Only -

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    • #32
      Not clear. Is the output DCV positive or negative wrt amp ground? yes dcv is +44v between junction 1 and 2 on J10a (see the diagram)

      Why +34V? Should be ACV. yes it is ACV and 34v

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