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Anyone Familiar With A 67 Vox Super Berkley III?

Discussion in 'Amp Tech Center' started by DennisM, Nov 1, 2020.

  1. Nov 1, 2020 #1
    DennisM

    DennisM Tele-Meister

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    I got one a few days ago. I took it apart to clean, check and tighten stuff. There's a plastic looking unit right by the reverb driver that's got resistors and caps on it. It has an allen head adjustment screw back in a hole, kind of a trim pot looking affair. It's attached to the chassis with a little L bracket. Anyone know what it adjusts? It's visible by removing the back cover. Stumped.
     
  2. Nov 1, 2020 #2
    VintageSG

    VintageSG Friend of Leo's Ad Free Member

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    The 'E' tuner?
     
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  3. Nov 1, 2020 #3
    Dacious

    Dacious Poster Extraordinaire

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    It could be a bias adjustment for the power amp - those vintage units used much the same architecture as tubes, push-pull class B setups. Couid also be a gain control for the preamp.

    http://www.voxshowroom.com/us/amp/guardsman_head.html

    It's worth taking it to someone who knows their stuff.
     
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  4. Nov 1, 2020 #4
    Jon Snell

    Jon Snell Tele-Holic

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    Correct.
    A simple oscillator with a few odd components to help it run and an adjustment for frequency.
    The birth of the 'on stage tuner'.
     
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  5. Nov 1, 2020 #5
    DennisM

    DennisM Tele-Meister

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    Possibly. Still searching. Thanks!
     
  6. Nov 1, 2020 #6
    DennisM

    DennisM Tele-Meister

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    Thanks much! Will give it a try.
     
  7. Nov 1, 2020 #7
    DennisM

    DennisM Tele-Meister

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    Thanks for the site link!
     
  8. Nov 1, 2020 #8
    oldlefty

    oldlefty TDPRI Member

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  9. Nov 1, 2020 #9
    DennisM

    DennisM Tele-Meister

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    Yep. Tuner. Just calibrated it with my Korg! Thanks guys!
     
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