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Looking for clean, readable JTM45 schematic

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  • Looking for clean, readable JTM45 schematic

    There seems to be a lot of copies of one JTM45 schematic, that looks to be a copy of a copy of a copy ... I can't read most of the component values. I did do a long search on the schematics page for Marshall, but many of the links are dead, haven't had any luck yet.

    Anyone know of a source for a clean, maybe a redrawn JTM45 schematic?

    Thanks,
    The only good solid state amp is a dead solid state amp. Unless it sounds really good, then its OK.

  • #2
    http://raw-sewage.net/images/jtm45-readable.jpg
    "I took a photo of my ohm meter... It didn't help." Enzo 8/20/22

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    • #3
      Yes, the re-issue is a good drawing, if you need the pdf the actual model # is 1962 so search for that.

      Mark Huss has a nicely redrawn original here: https://mhuss.com/amps/JTM45/index.html
      Originally posted by Enzo
      I have a sign in my shop that says, "Never think up reasons not to check something."


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      • #4
        Thanks Dude, thanks G1!!!!
        The only good solid state amp is a dead solid state amp. Unless it sounds really good, then its OK.

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        • #5
          Oh man they are all Beau-teee-fulll!!!
          Muchas gracias~!
          The only good solid state amp is a dead solid state amp. Unless it sounds really good, then its OK.

          Comment


          • #6
            Surprised how similar it is to the Fender style amps. Two things really stuck out to me anyway, bigger choke, bigger early power supply caps, and a cathode follower driving the tone stack.

            What is the purpose of the cathode follower in that spot in the circuit?
            The only good solid state amp is a dead solid state amp. Unless it sounds really good, then its OK.

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            • #7
              A cathode follower is better able to drive lower impedance loads. So less loading effect from the tone stack.
              Originally posted by Enzo
              I have a sign in my shop that says, "Never think up reasons not to check something."


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              • #8
                you need to compare it to a 5F-6 / 5F-6A.
                "Stand back, I'm holding a calculator." - chinrest

                "I happen to have an original 1955 Stratocaster! The neck and body have been replaced with top quality Warmoth parts, I upgraded the hardware and put in custom, hand wound pickups. It's fabulous. There's nothing like that vintage tone or owning an original." - Chuck H

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