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Cleaning Older SVT Tone Switches

Discussion in 'Amps and Cabs [BG]' started by JoeYello, Jan 24, 2003.

  1. JoeYello


    Sep 18, 2002
    New Jersey
    The tone switches on my old SVT (early 70's) are really starting to make alot of noise. These are the switches above the tone control knobs. How can I get at them to clean.

    Can I use a spray cleaner? Can these switches be easily replaced?

    Thanks, Joe
  2. Luckydog


    Dec 25, 1999
    Psycho Bass Guy, couldn't you just use a straw with the spray and squirt it around the edges of the rocker switches? Or are the actual contacts buried behind the rocker plate?
  3. BillyB_from_LZ

    BillyB_from_LZ Supporting Member

    Sep 7, 2000
    A few years ago, I restored a '73 SVT head. IIRC, the switches are regular slide switches (like the bright switch on an old Fender amp) and are hiding behind the rocker. You'll never get at the contacts unless you take the preamp out and attack it from the inside.

    While you're in there, you might as well do the rotary controls too.

    My amp was so filthy I had to take the covers off of the potentiometers, take them completely apart and use a pencil eraser on the element. After lubing them up with a little tuner cleaner they worked like new.

    Have fun and be careful around those expensive power tubes...

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