Mini Silverface Champ with One Tube Reverb?

Discussion in 'Shock Brother's DIY Amps' started by tvas22, Aug 23, 2019.

  1. sds1

    sds1 Tele-Afflicted

    May 4, 2017
    Orlando, FL, USA
    Well if you look at the Champ Micro Schematic on his page you'll see B+2 at 250V. Not sure what accounts for the discrepancy, he had a couple of revisions and it also matters whether you are measuring B+ voltage with or without tubes installed. We'd have to ask him. But no it won't vary case by case -- Ohm's Law cannot be argued with.

    More gain, more clean headroom.

    In the output section you will have less output power, less clean headroom compared to the higher voltages. In the reverb circuit you'll not be hitting the tank as hard and will have less reverb output signal.

    Just to be clear, nothing you are doing here is out of bounds, I wouldn't worry about it so long as your expectations are reasonable. That is to say, you've not cloned any of the 3 Champ designs we're referencing, it will not sound exactly like any of those amps -- your amp will have its own unique character.

    Since you've already selected your PT there's nothing that can be done about your B+ voltage, your B+2 to the preamp you have options though as discussed above. I'd recommend having the 3.3k and 33k dropping resistors on hand (or whichever you settle on) so you can A/B for yourself.

    Keep up the good work man.
    tvas22 likes this.
  2. tvas22

    tvas22 Tele-Meister

    Aug 28, 2016
    Ok, that’s great. Thanks again for all your replies, it’s been really helpful. I suppose I should start building it now and going from there!
    sds1 likes this.
  3. robrob

    robrob Poster Extraordinaire Ad Free Member

    Dec 29, 2012
    United States
    Since Champs are single-ended amps there's not a lot of voltage sag going on anyway so adding a choke shouldn't make substantial difference to tone and playability. It should help eliminate ripple and hum. Smoke 'em if you got 'em.
    sds1 and tvas22 like this.
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