My '65 AC 30 sounds better and (louder!) on 115 volts

Discussion in 'Audio Hardware' started by Boulder Bob, Feb 10, 2019 at 6:25 PM.

  1. Boulder Bob

    Boulder Bob Forum Resident Thread Starter

    Location:
    Boulder, CO
    Did an A-B (with another set of ears present) - amp was definitely louder with same control settings on 115 V vs 120 V. Used a Variac.

    Had more "impact" also

    Did not expect this.
     
    Last edited: Feb 10, 2019 at 6:50 PM
  2. Andy Mitri

    Andy Mitri Forum Resident

    Location:
    Up North
    Are you possibly talking about a Vox AC30 guitar amplifier?

    [​IMG]
     
  3. Boulder Bob

    Boulder Bob Forum Resident Thread Starter

    Location:
    Boulder, CO
    Yes

    1965 Vox AC 30 Top Boost. Has a voltage selector and 115 V is one of the choices
     
  4. Bingo Bongo

    Bingo Bongo No music, no Life

    Mine don't make any sound....

    [​IMG]
     
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  5. harby

    harby Forum Resident

    Location:
    Portland, OR, USA
    Tube amps will start to distort and break up earlier when they are undervolted, or in this case, providing a 1960's voltage. This could give you some of the subjective impression.

    We expect more tube B+ rail voltage directly proportional to the wall voltage, and this means more amp output. Without a test tone in and instrumentation to measure the result (vs a guitar, your picking consistency, and ears), it would be hard to make a conclusion in the +/- 2.5% range, especially one that gives results counterindicative to expected operation.
     
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