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Rebuilding a SF Champ

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  • Rebuilding a SF Champ

    Hey guys,

    I'm thinking of rebuilding a SF Champ from the ground up. I bought the thing for $5 and the transformers are no good, so nothing is lost by departing from stock, drilling holes, etc. I'd be fixing it up for a friend who already has a Budda and a Holland for on-stage stuff. He just wants a small amp that he can use in his apartment without the cops showing up. This would be used with a range of guitars: Nocaster, SG Junior, ES-335, ES-125, Strat. I just want something for him that can break up at moderate volume without the grit coming at the expense of useable semi-clean tones.


    Here's what I have in mind:

    Heyboer BF Champ PT, Hammond 125ESE OT, 9H, 200ma choke (maybe)

    6SL7 in v1, parallelled. Send to volume.

    12AX7 in v2 as a cathode follower feeding a 5F6-A style tone stack with a fixed midrange (equivalent to 4 if there were a midrange knob).

    6V6 cathode biased, basically the same as the original Champ, but with a 10W cathode resistor to allow him to sub in a 6L6G.


    How does this sound to you?

  • #2
    I'd recommend sticking with the stock Champ circuit (and board) - simple, tried and true tone!
    Using a 6SL7 for preamp gives a very cool sound.
    (Mixing an octal and 12AX7 preamp tube may negate the cool octal tone.)

    The choke may add to the unique sound of the 6SL7, which is favored for HiFi and harp.

    Check out the sound clips for my Octal Champ for an idea
    http://www.naturdoctor.com/Chapters/...ctalChamp.html
    See the birth of a 2-watt tube guitar amp - the "Dyno Tweed"
    http://www.naturdoctor.com/Chapters/Amps/DynoTweed.html

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