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  1. Don't forget the full size 6 pin DIN connector.:)

    Don't forget the full size 6 pin DIN connector.:)
  2. Thanks, Kismet. Looks like a pretty...

    Thanks, Kismet.
    Looks like a pretty straightforward and doable SMPS.
  3. Yeah, that is the Automix foot switch. It should...

    Yeah, that is the Automix foot switch.
    It should be correct.
    The OM is attached (with schematic) and the Duece ft sw wiring diagram.
    54757
    54758
  4. The three switches, R to L look like SPST...

    The three switches, R to L look like SPST switches.

    The one on the far right appears to be SPDT.

    The two on the right look like they are selecting to the Black wire.
    Without a schematic it's...
  5. The SM can be had here:...

    The SM can be had here: http://celedoniaorgan.netfirms.com/cos2/index.php?main_page=product_info&cPath=1_20&products_id=113&zenid=fc5af7e9f1bd9faa9b4b07bb744e2f3a
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    I take it R 41 is on the first schematic. The...

    I take it R 41 is on the first schematic.
    The power supply.
    R41 feeds the negative voltage regulator.
    Hard to imagine how that would affect the dc offset on the speaker terminal.
  7. "It's strange enough that I thought someone might...

    "It's strange enough that I thought someone might have run into it before"

    Nope.
    Not I.
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    Here are the schemes from DYA: 54743

    Here are the schemes from DYA: 54743
  9. "I tried an acoustic w/fishman in it and worked...

    "I tried an acoustic w/fishman in it and worked fine"

    It's an acoustic amplifier is it not?
  10. I would suggest that you contact Behringer: ...

    I would suggest that you contact Behringer:
    https://music.secure.force.com/SupportForm?brand=behringer&rt=gnt
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    I believe the 215D is closer to what you have. ...

    I believe the 215D is closer to what you have.

    https://imagescdn.juno.co.uk/manual/493464-01U.pdf

    The D series is Class D output while the A series is discrete component Class AB.
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    Oops. I was thinking audio taper.

    Oops.
    I was thinking audio taper.
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    Here is the B212A schematic: 54729

    Here is the B212A schematic: 54729
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    In a pinch, paralleling a resistor across the...

    In a pinch, paralleling a resistor across the control will 'work'.

    You are correct that the taper will be off.
  15. As far as I can tell, the first half of V2 is not...

    As far as I can tell, the first half of V2 is not used.

    The test points for the preamp Vdc is measured at the Cathode of the 12AX7's.

    The Vdc of the output tubes is well stated on the...
  16. So, exactly what is wrong with the original...

    So, exactly what is wrong with the original control?
  17. Would this work? 1M, solid shaft, DPDT switch....

    Would this work?

    1M, solid shaft, DPDT switch.
    ...
  18. I never found a replacement for that control when...

    I never found a replacement for that control when researching it in the past.:(
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    The 'storage mode' is a crude capture of the...

    The 'storage mode' is a crude capture of the glowing phosphor.

    I have used one for 'capturing' timing events.

    Pretty much not needed for guitar amp work.
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    Cool!

    Cool!
  21. Contact Behringer direct. ...

    Contact Behringer direct.

    https://music.secure.force.com/SupportForm?brand=behringer&rt=gnt
  22. Replies
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    "So download the free one from Elektrotanya. "...

    "So download the free one from Elektrotanya. "
    OK:)

    54484
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    I would suspect that the transformer is bad. ...

    I would suspect that the transformer is bad.

    Can you measure how much current the transformer is actually drawing without any secondaries hooked up?
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    Looks like a diode to me.

    Looks like a diode to me.
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    Might be a good time to build a 'lamp limiter' to...

    Might be a good time to build a 'lamp limiter' to keep from stressing the amp.

    There can be no second opinion as you have the amp. :(

    Try your best to narrow it down.

    Power Tranny: flying...
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    I'll second that!

    I'll second that!
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    I had one of these SL3242FX that drove me...

    I had one of these SL3242FX that drove me bonkers.
    The Right channel would drop out.
    I could duplicate it by pushing gently on the front panel.

    The Mute All Channels circuit was the cause of the...
  28. That is it.

    That is it.
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