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Thread: Links to Kustom schematics

  1. #36
    Master Destroyer nosaj's Avatar
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    Quote Originally Posted by RDC View Post
    I have a little Kustom Practice amp. It might be 10 years old. Its an HV30T tube preamp solid state power. There is also an HV30 they made that is probably the same insides in a different chassis but not certain of this. The treble control acts a bit like a reverse volume control. Could be a leaky cap bleeding the signal to ground. I need a schematic. The board inside it is marked B0038-21C and nothing like that is listed on the Kustom sites I have seen posted here. Anybody have one or know how I might find one?
    Or you could test the cap to rule out your suspicion. Just follow the treble control till you find a cap. Even with a schematic you'd till have to follow a trace as not all schematics come with a layout. But best bet call Kustom as suggested.

    nosaj

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  2. #37
    Senior Member vintagekiki's Avatar
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    Kustom Tube 12A

    http://sindor.sweb.cz/Tube12A.pdf
    Kustom Tube 12A Practice Amp

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    Last edited by vintagekiki; 12-27-2018 at 05:15 PM.

  3. #38
    Supporting Member Jazz P Bass's Avatar
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    The schematic supplied by VK may be helpful.

    The most likely cause is C13, a 270 picofarad treble capacitor.
    If it is faulty then you will see the treble control acting as a reverse volume control.
    The capacitor may look like this:
    Click image for larger version. 

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    Kustom Tube12A.pdf

    Tube12A Tone Control.pdf

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    Last edited by Jazz P Bass; 12-28-2018 at 07:00 AM.

  4. #39
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    Transformer Schematic Symbol

    The transformer primary winding, as shown on the referenced schematic, includes what looks like a resistor symbol at the top of the winding depiction. (Excerpt attached) Can anyone explain the meaning of that. I would not expect that they are indicating merely that the winding has resistance since all transformer windings always have resistance.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  5. #40
    Don't forget the joker g1's Avatar
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    Maybe their idea of the symbol for a themal fuse in the primary?

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  6. #41
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    Quote Originally Posted by g1 View Post
    Maybe their idea of the symbol for a themal fuse in the primary?
    Agreed. The presence of a thermal fuse would be a likely possibility but the schematic depiction is goofy. If it is a thermal fuse then maybe this is a case of a draftsman using whatever was available in the CAD SW library when generating the schematic. The schematic equivalent of changing the meaning of a word based on current slang usage?

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  7. #42
    Supporting Member Jazz P Bass's Avatar
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    Yeah, I think the engineer got carried away with that one.

    A simple 'squiggle' will suffice.

    Click image for larger version. 

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  8. #43
    Senior Member vintagekiki's Avatar
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