18 Watt TMB clone as small as I could make it.

Discussion in 'Building the Classics' started by spin, Dec 29, 2019.

  1. spin

    spin New Member

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    New guy here, I finished this amp over the summer. It's my first marshall build as well as my first amp layout. I built it on plywood first to work out the kinks.

    Back Open 02.jpg Front 03.jpg PCB 01.jpg JLC PCB (low).jpg Populated PCB.jpg Post Paint Chassis.jpg Turret Proto 2 (low).jpg
     
  2. BanditPanda

    BanditPanda Well-Known Member

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    Gotta admit that is pretty cool.
    A summer well spent.
    Congrats.
    BP
    AND :welcome:
     
  3. South Park

    South Park Well-Known Member

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    Nice job the boards look great
     
  4. scott-colorado2016

    scott-colorado2016 Active Member

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    So, why did you make it so small?
    Looks pretty cool. :coffee:
     
  5. spin

    spin New Member

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    I picked up the shell first on a pedal building forum with no idea what to do with it. I've already built a couple champs, and not really hyped on single ended stuff anyway. Decided on a stripped down TMB. The tighter the build got, the more determined I was to make it work.

    69552059_2090671701038825_366850916441128960_o.jpg
     
    scott-colorado2016 likes this.
  6. scott-colorado2016

    scott-colorado2016 Active Member

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    So you're like that guy trying to pick up 10 lbs of junk and put it in a 5 lb sack... I gotcha bound and determined to make it happen. Looks like some quality workmanship there. How does it sound? You say stripped down, guess it has no tremolo circuit? How stripped down is it?
     
  7. spin

    spin New Member

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    It sounds pretty good, I wish I had some clips. Took me some time to dial in the power nodes, ended up changing the power transformer for some extra volts. No trem. Single or parallel triode input into the TMB. Let me see if I can find a schematic, forgive it's drawn weird and may have errors, I never redrew it after the tweaking phase.

    Schem V1 - low - Voltages.jpg
     
  8. neikeel

    neikeel Well-Known Member

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    Looks very nice - presume the green board was protoype/development?
    Are you getting noise issues with proximity of transformers?
     
  9. DonP

    DonP Active Member

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    What are the specs on the output tranny?
     

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