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Low pwr build idea

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  • #1

    Low pwr build idea

    I have the chassis out of a real old (1951) Hammond DR-20 tone cab that came with the B-2 I had a while back. Looking over the schemo to decide what parts to rob out of it (there's a couple good size chokes) I noticed the reverb drive xfmr is a p-p type. They drive it with a 6SN7. I'm thinking using it as an output xfmr with the same arrangement might really get it as a low pwr output section. The fluid spring unit it was driving measures just over 6z on the drive coil making it suitable for an 8z load.

    http://www.captain-foldback.com/Hamm...atics/HR-1.jpg

    Anyone ever try this? Could be a cool project. I might mock it up on the bench later today if I get time. May even try hitching it up to a 6CG7 and see how that does.
    The farmer takes a wife, the barber takes a pole....
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  • #2
    That's a cool circuit. Not only is the driver P-P, but the transformer secondary is balanced (center tap grounded), the recovery amp is differential, and is mixed back with the input signal differentially at the PI inputs.
    If you use it for a flea amp, notice that there is no preamp. You may want another preamp stage in front, or feed it with a boost pedal.
    Black sheep, black sheep, you got some wool?
    Ya, I do man. My back is full.

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    • #3
      Oh I wasn't intending to use it as is. Its been hack repaired anyway and had a meltdown. I just got to looking at the circuit and figgere'd judging by the size of that rev drive xfmr it'd make for a decent output section in a rainy day build. The output xfmr is a big paperweight.....I don't want to screw with all the feedback they designed into it. Sucks 'cause a 4-6V6 amp sounds interesting.
      The farmer takes a wife, the barber takes a pole....

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      • #4
        Originally posted by Gtr_tech View Post
        Oh I wasn't intending to use it as is. Its been hack repaired anyway and had a meltdown. I just got to looking at the circuit and figgere'd judging by the size of that rev drive xfmr it'd make for a decent output section in a rainy day build. The output xfmr is a big paperweight.....I don't want to screw with all the feedback they designed into it. Sucks 'cause a 4-6V6 amp sounds interesting.
        Just ignore the feedback winding and you have a great piece of iron with extra good low freq. response!

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