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Chassis layout critique

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  • #1

    Chassis layout critique

    For those who have followed the other threads, this is my power amp that's from a Peavey Deuce. The chassis I have to work with is 24" x 8". The output tubes positions are locked down. The power tranny and output tranny can be moved, but since they're already on opposite ends of the chassis, I'm probably good. What I'm really interested in is the position of the preamp tubes becuase I haven't punched the chassis fro these yet. The left tube is the first gain stage, the right tube is the phase inverter.

    If you happen to see anything with the board layouts, I'd be interested in hearing it.
    Attached Files
    -Mike
    Tags: None
  • #2
    Not a giant amount of gain with only one tube before the PI. Still, I think V1 should be at the left end of the circuit card, farther away from the output tubes and closer to the front panel.
    WARNING! Musical Instrument amplifiers contain lethal voltages and can retain them even when unplugged. Refer service to qualified personnel.
    REMEMBER: Everybody knows that smokin' ain't allowed in school !

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    • #3
      If it is possible to move the OT, something like this would likely be more stable. Believe it or not, you can avoid hum induced in the OT by placing it just a couple of inches away (or even less) from the PT and orienting the lams at 90* to the PT lams. Much more important to keep your input and preamp away from the OT IMHE.

      Chuck
      Attached Files
      "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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      • #4
        Originally posted by Chuck H View Post
        If it is possible to move the OT, something like this would likely be more stable. Believe it or not, you can avoid hum induced in the OT by placing it just a couple of inches away (or even less) from the PT and orienting the lams at 90* to the PT lams. Much more important to keep your input and preamp away from the OT IMHE.

        Chuck
        That OT kissing PT is great for the hum. But its not so funny to lift those 100Watt heads and have one side scrape the pavement.
        It works fine to have the transformers flared out at the ends and rotate the OT in that position. You can sometimes get a tiny little hum that often drowns in the noise from the preamp

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        • #5
          Thank you all for the suggestions. I'm gonig to punch the chassis for the first gain stage in a couple of different locations and see which one works out the best.

          I'm not totally against moving the OT to the same side of the amp as the PT. At first I was thinking of it being off balance would be a pain, but relocating the handle is easy enough, and thinking back to having my triple rec, it'd be nice to have all of the weight at one end for when I'm carrying it up and down stairs. Keeping all of the weight close to my body makes it easier to move, less of a lever moment.
          -Mike

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          • #6
            Originally posted by defaced View Post
            and thinking back to having my triple rec, it'd be nice to have all of the weight at one end for when I'm carrying it up and down stairs. Keeping all of the weight close to my body makes it easier to move, less of a lever moment.
            Put side handles on it. Use both hands to carry. Much easier up those stairs

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