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Ampeg SVT IIP, fading in and out.

Discussion in 'Amps and Cabs [BG]' started by Asomodai, Apr 9, 2010.

  1. Asomodai


    Jan 21, 2006
    London UK
    Hey guys.

    My Ampeg SVT IIP Preamp has a slight problem, it has two inputs, Normal and "Bright"

    The Normal input works fine with no problems, When using the bright input, the volume fades in and out at random times.

    The valves have just been replaced.

    Any ideas?

  2. Flatbass


    Mar 13, 2004
    I know that I'm bumping an old thread, but I have the exact same problem with my SVT-IIP!

    In addition to the volume fading in and out, mine also loses all bass response occasionally. The 'Normal' channel works fine.

    Anyone have any ideas on what my be the problem?

    There are three tubes inside the thing. Do both input route the signal through all three tubes, or is there a separate 12ax7 for each input, for example?


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