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Modded JTM60 question

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  • #1

    Modded JTM60 question

    Hi fellas. I have a modded JTM 60 that I just love. My question is what did this mod do for me and can I improve on it? The red values are what have been changed. the Pdf is all original. All mods came from a fella named Gunner on a different and now defunct forum. Thanks in advance,Greg
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  • #2
    It's hard to say what's been changed without the original values indicated. I could take the time to look up a stock schem and then bounce between that one and yours, but I won't.

    Just guessing based on experience, the mods are doing a few things that all amount to reducing buzzy-ness in the preamp clipping and focusing the bottom end for more definition.
    "Take two placebos, works twice as well." Enzo

    "Now get off my lawn with your silicooties and boom-chucka speakers and computers masquerading as amplifiers" Justin Thomas

    "If you're not interested in opinions and the experience of others, why even start a thread?
    You can't just expect consent." Helmholtz

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    • #3
      He has two links there, Chuck, for exactly that purpose.
      Education is what you're left with after you have forgotten what you have learned.

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      • #4
        Oh... Sorry. I guess that slipped past me. I thought they would be the same thing for some reason. My bad.
        "Take two placebos, works twice as well." Enzo

        "Now get off my lawn with your silicooties and boom-chucka speakers and computers masquerading as amplifiers" Justin Thomas

        "If you're not interested in opinions and the experience of others, why even start a thread?
        You can't just expect consent." Helmholtz

        Comment

        • #5
          Looking at the two schematics...

          I'll stand by what I posted before and add that the mod seems to include removing a diode clipper. So, changes the clipping, and probably reduces it a little. All tube clipping now.
          "Take two placebos, works twice as well." Enzo

          "Now get off my lawn with your silicooties and boom-chucka speakers and computers masquerading as amplifiers" Justin Thomas

          "If you're not interested in opinions and the experience of others, why even start a thread?
          You can't just expect consent." Helmholtz

          Comment

          • #6
            Thanks chuck. Yeah I know about the deleted clipping diodes and that the distortion is now from the tubes. I've changed the schematic to include the original values. I guess what I'm asking is how is this different from the original set-up? Sorry for the newbie questions but I'd like to know more about how this amp does what it does. Thanks again, GregClick image for larger version Name: jtm60power(modded).jpg Views: 1 Size: 1.11 MB ID: 833127

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