NAD ! a special 5C1/GA5 :-)

Discussion in 'Glowing Bottle Tube Amp Forum' started by TheDams, Jan 20, 2020.

  1. TheDams

    TheDams Tele-Holic

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    Happy New Amp Day for me !

    A local builder (EarFuzz Effects) built that little beast for me.
    Based on a 5C1/GA5, with a 5SJ7 for preamp, choice of 6v6 or 6l6 for power, 5Y3 or SS rectifier.

    Tone control (that you can bypass via pull-push pot).
    Oversized transformers.
    Super quiet.

    2 cabs loaded with 10" Jensen P10R and a vintage Magnavox Alnico speaker.

    Great tones for ever ! from Tele to SG, low output singles to P90 and mini-hums, it loves everything !

    Nice woodworking (dovetails joints, etc.), I love the "handle" !
    Jason builds almost everything from scratch, from chassis to turret board.

    Pics or it didn't happen (with crappy old android phone...). The guts pic is not from me, it is one of Jason early build.

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    Last edited: Jan 20, 2020
  2. Mayas caster

    Mayas caster Tele-Holic

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    Looks good!!!
     
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  3. wrathfuldeity

    wrathfuldeity Tele-Afflicted

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    Well dats the cats meow. I'd love to have an octal se with those options...actually had an old silvertone 1301 and foolishly gave it to my son and he won't let me borrow it back. Damm kid.
     
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  4. Squawker

    Squawker Tele-Meister

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    Nice!

    Considering a 6SJ7 Champ-ish thing myself (amongst loads of other possible projects - "fortunately" I have neither the time or the spare cash to embark on these journeys.)
    Did your guy stick with the 5C1 grid leak bias design for the 6SJ7? It looks like it. How does that fare with pedals?

    I'm planning to go with cathode bias (Silvertone 1301 is one of many examples) if I ever get around to this, as that should be more pedal friendly and less tube critical.
     
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  5. muchxs

    muchxs Doctor of Teleocity

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    FischerZ.png
     
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  6. TheDams

    TheDams Tele-Holic

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    Yep, we stick with the grid leak bias design, and nope, no problems with pedals. I use:
    Tuner->Wah->buffer/boost->tremolo->reverb... and it sounds great !
     
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  7. Squawker

    Squawker Tele-Meister

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    Excellent! And inspirational :)

    The danger with grid leak and pedals is if you goose the input - you can quite easily push it beyond the bias limit if the signal is too big, and the lovely natural distortion will turn into farts :)

    These amps were designed when the hottest input around was a P90 or an overwound Broadcaster bridge, and pedals didn't exist. Grid leak saved a resistor, possibly a cap(*) and a couple of solder joints!

    (*) not necessarily, as grid leak needs a blocking cap on the input whereas fixed/cathode bias don't but may have a bypass cap in the bias circuit.
     
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