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  1. I of course have not seen it, but think of this:...

    I of course have not seen it, but think of this:

    Voltages were OK before, but then you restored a ground, and now that allows some other defective part to conduct current to ground, dragging down...
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    Nothing. They used the same board for more than...

    Nothing. They used the same board for more than one model, certain parts differences would be for that. Like C81,82 are in the same spots as C40,41, but the "missing" parts were axial leaded and...
  3. DeVille/Deluze series - hot rod and blues -...

    DeVille/Deluze series - hot rod and blues - developed over time. You could follow them as they worked to consolidate the models. Using the same board for several models, just install different...
  4. I would suspect that whatever configuration you...

    I would suspect that whatever configuration you have, aside from the glitch, the amp works fine, the bias is fine. SO the thing to do is repair the amp, not redesign it or modify it to some other...
  5. Many times the difference is inside. Look...

    Many times the difference is inside. Look closely to see if your boards look like the ones in the schematic.

    So the right power amp is bad in some way.

    Apply a sine wave to the channel, and...
  6. yes, that is great advice. I recall my service...

    yes, that is great advice. I recall my service manual which had several sections for groups of serial numbers, as they made changes over the production life of the model, and that was a couple...
  7. No, that sounds like a connection.

    No, that sounds like a connection.
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    No, in diode test the reading is not in ohms. In...

    No, in diode test the reading is not in ohms. In diode test the reading is voltage drop across the junction. The reading is in volts. For a diode, typically 0.4v to 1v.
  9. Did you measure it? Please don't go out and get...

    Did you measure it? Please don't go out and get that resistor and change it just to see if I got it right. Measure the thing. It should measure like zero ohms on your meter, like touching your...
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    This way probably works well enough, I don;t...

    This way probably works well enough, I don;t recall Ampeg making stinkers. This method uses all parts they have on hand. Dual triode tubes and sockets, basic parts. Fender style means they'd...
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    I learned that lesson^^^^the hard way. As a kid...

    I learned that lesson^^^^the hard way. As a kid I had few tools and only hand operated drills. Then I got a 3/8 Black and Decker power drill for Xmas. Trying to drill a hole with a 3/8' bit into...
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    The trem LFO feeds the grids of the two triodes. ...

    The trem LFO feeds the grids of the two triodes. That causes currents through the two triodes to vary with the trem pulses. Changing current makes them for all the world a varying resistance. Note...
  13. Seems like it is motorboating. First thing I'd...

    Seems like it is motorboating. First thing I'd check is if R34 is open.


    Possible bad TDA2050.

    And of course check the power supplies for voltage and ripple.
  14. No reason at all to remove that crosswise cap.

    No reason at all to remove that crosswise cap.
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    Dumb little cap meters like the ones in a DMM...

    Dumb little cap meters like the ones in a DMM send a small charging current out to the DUT, and reads the rate the voltage rises. It then translates that into capacitance. Well, if your cap is...
  16. Ever notice the doors in places like hotels or...

    Ever notice the doors in places like hotels or schools? The hinges are so much more heavy duty than ones in your home. Same for the latch and knob. That stuff is meant to last years under heavy...
  17. And I hate to repeat myself, but... It is only...

    And I hate to repeat myself, but...

    It is only a guitar amp, tiny little differences in specs is not going to matter in the overall circuit.


    "Better" is an illusionary term. What does better...
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    Idle thought: Go to a motorcycle shop or other...

    Idle thought:

    Go to a motorcycle shop or other place that routinely gets stuff chromed and ask if they would toss your parts in with their next outgoing batch.
  19. Thread: Decibel Meters?

    by Enzo
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    On the other hand, a friend of mine played...

    On the other hand, a friend of mine played trombone for the Temptations, played on the stage at Madison Square Garden behind them. They had NO amplification, their horn blowing was expected to be...
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    My take on high gain pedals: Any increase in hum...

    My take on high gain pedals:
    Any increase in hum they make is OUTSIDE the amp. Other than add some exotic signal processing, there is nothing you can do IN the amp to kill hum added to the signal...
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    There are two 12AU7s and a12AX7 on the power amp....

    There are two 12AU7s and a12AX7 on the power amp. MAKE SURE you have the correcrt tubes, and they are in the correct sockets.

    When I got SVTCLs that wouldn't balance the LEDs, more often than not...
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    Seriously, did you call Kustom and ask?

    Seriously, did you call Kustom and ask?
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    You have something wired wrong, pretty much has...

    You have something wired wrong, pretty much has to be on the small AC board.

    Your schematics are incomplete, you are missing the AC board.

    The way this works is the main power switch turns on...
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    They resurrected the Kustom name, product has...

    They resurrected the Kustom name, product has nothing to do with the original stuff.

    WHen they came along, I signed on as a warranty station, but in the five years before renewal of status, I...
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    C92 is at the input, it connects between X11 pin...

    C92 is at the input, it connects between X11 pin 2 and R126. + end towards the resistor. That is the INPUT B circuit.

    C92 is the equivalent to C93 in the INPUT A circuit, which use as a model.
    ...
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    I could be wrong, but I think this is latter day...

    I could be wrong, but I think this is latter day Kustom, the reborn company, not from the old tuck-n-roll days.
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    I would start by calling the company and asking...

    I would start by calling the company and asking if they can provide it.

    https://www.kustom.com/contact-us
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    Oh, AMEN. NOTHING smells like burnt selenium...

    Oh, AMEN.

    NOTHING smells like burnt selenium rectifier. And even after 50 years, I would recognize it instantly.

    Burnt resistors smell different from burnt plastic transistors. Caps smell...
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