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  1. Can you post a pic of the board(s)? Maybe we can...

    Can you post a pic of the board(s)? Maybe we can figure out which schematic to use.
  2. Here's a schematic for the Cube 60D. Is it...

    Here's a schematic for the Cube 60D. Is it similar to the amp you have in front of you?

    https://www.manualslib.com/manual/1332007/Roland-Cube-60d.html

    I also have a schematic for a Cube 60, but...
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    Also, in post #1, you said the diode, "measures...

    Also, in post #1, you said the diode, "measures 0.4v in one direction, and 0.5 in the other". In post #11 you said, "the one I have drops ~6v". I'm confused. Which is it?
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    We're not entirely sure what's going on in the...

    We're not entirely sure what's going on in the circuit without a schematic. Does the zener go from G-S on the FET (check with meter). If so and it's for protection, the NTE2973 has a typical on state...
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    It looks repairable to me (without seeing the...

    It looks repairable to me (without seeing the underside). Just cut out the burnt board. It appears that the burnt part will be between traces.
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    Are you using the correct 9V AC power supply?

    Are you using the correct 9V AC power supply?
  7. Thread: ADA8000

    by The Dude
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    https://www.electronica-pt.com/esquema/audio/behri...

    https://www.electronica-pt.com/esquema/audio/behringer-audio/behringer-ada8000-16003/
  8. Agree with the above suggestions and add: Also...

    Agree with the above suggestions and add: Also check the supplies to the op amps pins 4 & 8 (+&- 15V-ish). If you are missing one of the supplies, you might get the symptoms described.
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    Have you tried a factory reset? It could just be...

    Have you tried a factory reset? It could just be corrupt data.

    To restore factory programs:
    Plug the RP6 in while holding down the parameter select <up> key
    When rst appears in the display...
  10. Was there something he didn't like about it? If...

    Was there something he didn't like about it? If not, I see no reason to redesign it.
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    BadCat Panther R Tube Chart

    Posting this to save others hassle and confusion. BadCat has the tube chart wrong for their own amp. Below is the (incorrect) diagram directly from BadCat and one that I have corrected to show actual...
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    I don't see a schematic posted, but are there...

    I don't see a schematic posted, but are there zener diodes after the regulators? If so, you could have a bad zener or 2.

    Edit: Here we go.
    ...
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    Did you check them out of circuit? Both of them...

    Did you check them out of circuit? Both of them are parallel with 10 ohm resistors, so you'll be reading across the resistors if you measured in circuit.
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    If the zener measures .4V one direction and .5V...

    If the zener measures .4V one direction and .5V the other out of circuit, it's leaky/shorted.
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    If you don't have a scope, use a test tone and...

    If you don't have a scope, use a test tone and your meter set to AC volts.
  16. 1) Do you plan to also use the Bartel...

    1) Do you plan to also use the Bartel speaker/amp, or do you want it muted.
    2) What is the slave amp? Does it have instrument level inputs or line level inputs?
  17. Looks like there's one here. You'll have to...

    Looks like there's one here. You'll have to create an account, though.

    https://www.diyaudio.com/forums/chip-amps/124029-hot-rodding-ashly.html
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    Your schematic link in post #1 is dead, at least...

    Your schematic link in post #1 is dead, at least for me.
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    Juan, As I said in post #3, I've gotten those...

    Juan,

    As I said in post #3, I've gotten those lamps from Loud in the past. They only recently sold Ampeg. Now, maybe they sold their parts stock, too. But, maybe not. It's certainly worth a phone...
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    I like that story as a lesson to logically...

    I like that story as a lesson to logically troubleshoot. There are those who would have first installed a new power transformer.
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    :spin::spin: Just call Loud. ...

    :spin::spin:

    Just call Loud.

    https://loudaudio.com/contact/
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    They have 36V cars in Canada? ;)

    They have 36V cars in Canada? ;)
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    My best advice is to get a set of probe...

    My best advice is to get a set of probe extensions so that you can test with minimal disassembly. I have a set and they are invaluable.

    54730
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    Across the pond? Loud is a US company and your...

    Across the pond? Loud is a US company and your profile says Indiana? :confused:
    Last time I called Loud for these, I think it took less than a week and they were around 2 bucks a piece.
  25. Just about any old piece of wire will work...

    Just about any old piece of wire will work (within reason). That circuit won't draw much current. Generally, on an active guitar, which this basically is, the battery ground will go to a stereo input...
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    Have you tried contacting Loud directly? ...

    Have you tried contacting Loud directly?

    https://loudaudio.com/contact/
  27. If the volume pot for channel B was open, you had...

    If the volume pot for channel B was open, you had no attenuation at all.
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    I wouldn't think so, but anything is possible....

    I wouldn't think so, but anything is possible. You could test it with a hair dryer if you like- PTC, so resistance should increase with temperature. Does it locate near the heat sink as I conjectured?
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