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  1. Replies
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    As designed, it is a serial loop circuit. When...

    As designed, it is a serial loop circuit.

    When nothing is plugged into the loop jacks, the circuit is bypassed.

    So jumpering the jacks engages the circuit.
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    Other way around. The jacks are before the...

    Other way around.
    The jacks are before the switches.
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    "Natures Way" : Spirit ...

    "Natures Way" : Spirit

    https://www.bing.com/videos/search?q=nature%27s+way+song&docid=608018651095632091&mid=886170EAB297A36DA3F3886170EAB297A36DA3F3&view=detail&FORM=VIRE
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    Keep in mind that the "Main / Monitor" selection...

    Keep in mind that the "Main / Monitor" selection is after those two jacks.
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    You can use the front panel Main Out & Monitor...

    You can use the front panel Main Out & Monitor Out jacks.
    Send each, one at a time to another amp.
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    You may be seeing 'positive feedback'. Try...

    You may be seeing 'positive feedback'.

    Try lifting R33 in the feedback path.
    If the signal then is reduced at the output, reverse the OT primaries.
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    Although you have not done proper troubleshooting...

    Although you have not done proper troubleshooting to determine if , maybe, it is a preamp problem?
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    Here is the Behringer USA contact for parts:...

    Here is the Behringer USA contact for parts:...
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    Depending on the current draw of the LED strip, I...

    Depending on the current draw of the LED strip, I would install a separate power pack. (why mess with the amp?)
  10. Grounded adapter or not I would want to know...

    Grounded adapter or not I would want to know where in the heck the voltage source is?

    I mean, come on. A laptop should not zap you.
  11. Replies
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    "In the process, I have isolated a microphonic...

    "In the process, I have isolated a microphonic preamp tube, and a bad new one right out of the box"

    Well, that right there should be A problem.
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    I had a HRD come in that was blowing fuses....

    I had a HRD come in that was blowing fuses.
    Until I lifted the OT off of the chassis.:(
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    You may be correct that 'they were not made to...

    You may be correct that 'they were not made to come apart'
    I think the wires where soldered into the pins (like a Fender reverb/ footswitch connector) and then the shell was crimped to lock it.
    ...
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    Howdy, Glen. Here is the service manual. 57023...

    Howdy, Glen.
    Here is the service manual.
    57023
    I am not a guru but I see nothing esoteric in the circuit that would require tweaking.
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    A lot of effort to get them apart fully. SMD...

    A lot of effort to get them apart fully.

    SMD heaven. (or Hell)

    Be aware that to run the amp out of the enclosure you have to jumper circuit points that are normally connected through the...
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    40,000 people a year, on the average, die in...

    40,000 people a year, on the average, die in automobile accidents every year in the USA.

    Are you paralyzed with fear when you drive?

    Maybe we should be.:(
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    The only way to 'know' is to break the feedback...

    The only way to 'know' is to break the feedback loop. (R58 and the Resonance switch in the open position)

    If the signal increases, then the wiring is correct.
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    Here is a repost of the above schematic files: ...

    Here is a repost of the above schematic files:
    56977
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    Sounds to be as if U6 may be at fault. Is the...

    Sounds to be as if U6 may be at fault.
    Is the signal path 9/13, 11/12 good & does it change state with the switch?
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    " I tried to measure the voltages on the...

    " I tried to measure the voltages on the secondary of the main transformer using the (-) of the bridge".
    Whoa Nellie.
    Most SMPS 's have the primary supply and the secondary supply isolated.
    It...
  21. How about a pic of the output transistors? Look...

    How about a pic of the output transistors?
    Look to see if they are shorted.
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    Here is the schematic: 56844

    Here is the schematic: 56844
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    Here are the schematics: 56834

    Here are the schematics: 56834
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    There is very little real info on that...

    There is very little real info on that manuafacturer.
    Open it up.
    How is it wired.
    I would expect it to be Fenderish like a Bassman.
  25. Here is the complete schematic 56809

    Here is the complete schematic 56809
  26. Replies
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    Here you go: 56808 Oops. That is the non...

    Here you go: 56808

    Oops. That is the non chorus amp.

    If that helps great.

    If not, as always, your best bet is to CALL Peavey and ask.
  27. Oops. I did not take note that the issue is with...

    Oops.
    I did not take note that the issue is with the HT fuse removed.
    The way I see it is you have 2 .022 caps, 2 100uf caps and 4 diodes.
    Build a bridge on the bench and try to power that up.
    No...
  28. I would disconnect the high voltage to the output...

    I would disconnect the high voltage to the output transformer.
    That would isolate the main B+ from the preamp voltages.
    If everything holds up, I would tend to think the OT is shorting.
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