NAD: My finest yet - 20w Marshall style lunchbox amp.

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4114Effects4114Effects Frets: 3131
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Gave myself a rare Saturday off today to finish my Christmas project. Wanted to make something that would do the JCM800 thing, but at a bit lower volume.

Knocked up a little lunchbox sized head over the Christmas break, finally had chance to finish the circuit and assemble today.

Marshall JCM800 preamp with a host of tweaks - Full TMB tone control, gain trim (like an overdrive fine-adjustment dial), PPIMV, presence and resonance controls plus external bias points. Switches for bright (3-position), boost (lifts tonestack for a lot more drive) and fat.

Uses 3x 12AX7 preamp valves and a pair of JJ 6v6, fixed bias for 20w output.

Packs a massive punch for a small chassis.

I've also tried a new technique - etching a PCB for the build. I know it may annoy some purists, but it makes for a neater build and seems to work perfectly. 

Anyway, on with the pics.





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Comments

  • WazmeisterWazmeister Frets: 9413
    Mate, and I say it every time, I think your stuff is some of the most creative and visually inspiring that Ive seen !! Be proud of it Dan... :)
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  • bbill335bbill335 Frets: 1368
    Another one looking lovely inside and out. Great stuff.
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  • andy1839andy1839 Frets: 2196
    That's lovely. 
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  • longshinslongshins Frets: 246
    Lush! Purely aesthetic but I can't help but wonder if there might be a better choice for the corners instead of black.
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  • 4114Effects4114Effects Frets: 3131
    tFB Trader
    longshins said:
    Lush! Purely aesthetic but I can't help but wonder if there might be a better choice for the corners instead of black.
    Looked everywhere for gold corners. Silver would have been plain wrong. Black seemed inoffensive ... :)
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  • AlnicoAlnico Frets: 4616
    Wow
    Just WOW !

    This stuff fascinates me.
    That's tidier than some big name amps i've owned in past years, really well done.
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  • RaymondLinRaymondLin Frets: 11772
    Every time you make a new amp I WANT it.
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  • JezWyndJezWynd Frets: 6016
    That looks fantastic, great work.
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  • TTBZTTBZ Frets: 2867
    Looks awesome :) something like this would be just the job for me.
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  • 4114Effects4114Effects Frets: 3131
    tFB Trader
    TTBZ said:
    Looks awesome :) something like this would be just the job for me.
    I could be persuaded to part with it. I'm a clean amp and pedals guy, just enjoy building them :-)
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  • Every time you make a new amp I WANT it.

    What this chappy said. 
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  • Splendid work fella! The etched pcb looks like a work of art on its own.
    The Swamp City Shakers
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  • BrizeBrize Frets: 5608
    Goodness me that's impressive.
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  • Superb, love to try that out. Best Marshall I ever had used 6V6's
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  • I need this amp :)
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  • mixolydmixolyd Frets: 826
    So, so classy.

    If it were a Vox Top Boost-style I'd be breaking the piggy bank.
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  • TimmyOTimmyO Frets: 7332
    Every time you make a new amp I WANT it.
    ^ THIS 
    Red ones are better. 
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  • ICBMICBM Frets: 71862
    Superb, love to try that out. Best Marshall I ever had used 6V6's
    Studio 15?

    This one looks great too! Nothing wrong with a decent quality PCB at all.

    "Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski

    "Just because I don't care, doesn't mean I don't understand." - Homer Simpson

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  • thermionicthermionic Frets: 9453
    That sounds like the amp everybody wants Marshall to make.

    It would look fantastic in a full-width head with more space between the knobs though ;)
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  • Well Wow Worthy
    Only a Fool Would Say That.
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