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  1. http://www.abamps.com/contactus.html

    http://www.abamps.com/contactus.html
  2. Replies
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    Don't forget the voltage rating. That is the...

    Don't forget the voltage rating.

    That is the voltage level that the fuse can withstand without internally arcing over in the event of a failure.
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    Have you tried 'biasing' the tubes until the...

    Have you tried 'biasing' the tubes until the crossover notch just disappears?

    I use a lowish output voltage for the test.
    Forget about the slight notch that appears when approaching full power!
  4. Replies
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    If you start mucking around replacing caps &...

    If you start mucking around replacing caps & other parts with the amp nonfunctional at this point, how will you know if you got it correct.

    That is why I strongly advise that you troubleshoot the...
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    The schematic copy with better resolution: ...

    The schematic copy with better resolution:

    53917

    53918
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    221

    Is this the Sano amp that the reverb recovery...

    Is this the Sano amp that the reverb recovery goes to a separate 5" or 6" speaker?
  7. Replies
    63
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    1,031

    My advise is to NOT do anything until else to the...

    My advise is to NOT do anything until else to the amplifier you get the amp working.
  8. Misprint. 1N4007 diode is what you want....

    Misprint.
    1N4007 diode is what you want.
    (1N7007 does not exist)
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    It's only a guess but I would venture that the...

    It's only a guess but I would venture that the Green wire is ground.
  10. Replies
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    189

    More direct link to the schematic:...

    More direct link to the schematic: https://music-electronics-forum.com/attachment.php?attachmentid=53906&d=1560185842
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    Reload of schematic: 53906

    Reload of schematic: 53906
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    If the amp is anything like some of the QSC amps...

    If the amp is anything like some of the QSC amps (as concerning the I/P limiting circuit) this should be a once and done adjustment.
    QSC has you drive the amp to full power into a dummy load (we are...
  13. Sticky: A quick, down & dirty test of the OT polarity...

    A quick, down & dirty test of the OT polarity with negative feedback:
    -Drive the amp to a certain level.
    -Measure the output voltage.
    -Now disable the feedback path (wire, resistor) while...
  14. Not too clear on the issue. If you disconnect...

    Not too clear on the issue.

    If you disconnect the SMPS X4 connector the 40Vdc /80Vdc voltages are good?
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    The Classic 30 switch will work. 53830

    The Classic 30 switch will work.

    53830
  16. Non DSP: 53828

    Non DSP: 53828
  17. Here is the Champion 30 DSP service manual. ...

    Here is the Champion 30 DSP service manual.

    53826

    Read Page 5 as it pertains to the signal flow.
  18. Here is the schematic that I have: 53816

    Here is the schematic that I have: 53816
  19. Pignose.com calls out a 15Vdc supply:...

    Pignose.com calls out a 15Vdc supply: https://pignoseamps.com/product/regulated-ac-adaptercharger-for-hog-series-amps/
  20. worth a shot ;...

    worth a shot ; https://www.ebay.com/itm/Marshall-8100-Valvestate-100V-One-Tube-Preamp-Head-Chassis-Only-parts-Repair/264281080453?hash=item3d88614285:g:ITkAAOSwhrpcRMvg
  21. Replies
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    1,031

    Unfortunately, solid state amp repair can be a...

    Unfortunately, solid state amp repair can be a real 'bear'.

    Tube amps are relatively easy as the high voltage stages are coupled to the next stage by Vdc blocking capacitors.
    Which makes things...
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    Awe inspiring troubleshooting!

    Awe inspiring troubleshooting!
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    "You mind sharing how and where I can measure AC...

    "You mind sharing how and where I can measure AC ripple".
    You have already demonstrated that you can safely measure the DC voltage on the power supply nodes.
    So do the same except set your meter to...
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    That circuit is an inverting amplifier. If you...

    That circuit is an inverting amplifier.

    If you have ANY voltage across R1 (1K), then that voltage will be 'amplified' by the gain of the circuit . (47K/1K).
  25. Have you attempted to contact Proel? ...

    Have you attempted to contact Proel?

    https://www.proel.com/index.php?route=locator/locator
  26. Where in the world did you find those rivets?

    Where in the world did you find those rivets?
  27. http://www-personal.umich.edu/~damont/FarfisaCombo...

    http://www-personal.umich.edu/~damont/FarfisaComboCompactCompleteUserServiceManual.pdf
    That looks like a winner.
  28. I would predrill a small pilot hole before...

    I would predrill a small pilot hole before hammering in the new rivets.
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