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Ampeg question

Discussion in 'Amps and Cabs [BG]' started by Mr Matt, Mar 23, 2006.

  1. Mr Matt

    Mr Matt Supporting Member

    Jan 18, 2005
    Washington State
    Got my 2nd Ampeg head just recently it's a '93 SVT-III Pro and I had a question about the Plate Voltage knob. What's it for? Wrote Ampeg, yet to get a response. Can anyone help me out on this one? Thanks!
  2. brothernewt

    brothernewt Some people call me the stormtrooper of love...

    Apr 13, 2004
    Happyrock, OR
    This is just an educated guess, so don't take it as gospel: I think it's the same as the "tube gain" knob on the newer versions.

    cut/paste from Ampeg site about that knob:
    13. TUBE GAIN: The tube gain control varies the
    high voltage supply to the power amp tubes. This
    allows a variety of tonal response characteristics from
    the power amp and replaces the limiter found on typical
    solid state power amps. At “10” the voltage is at
    maximum, providing a dynamic, highly responsive
    tone. At “0” the voltage is at minimum, offering a thickened,
    more compressed tone. This tone can also be
    distorted, depending on volume level. In between settings
    are best for preventing harsh distortion when
    driving the power amp to its limits. The effect of this
    control increases from moderate to dramatic as the
    power amp is driven harder.
  3. 8mmOD


    Mar 20, 2005
    I endorse & use Tech 21 pedals, Eminence loaded cabs, EMG pickups, Jim Dunlop picks & Ernie Ball Strings, BC Rich Basses.

    consider mine gospel
  4. I'd assume that is correct, as I've heard tube gain and plate voltage used together.

    0 is a thicker more compressed tone, 10 is a cleaner tone. One of the best tone-shaping parts of the amp IMO.

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