Ampeg SVTIIP Slide Pot - know where to get one?

Discussion in 'Amps and Cabs [BG]' started by Bass 45, Feb 5, 2014.


  1. Bass 45

    Bass 45 Supporting Member

    Jun 23, 2011
    Tempe, Arizona
    Hello

    I have an SVTIIP (made in '93) bass preamp with a broken slide pot in the eq section.

    I've removed the damaged pot and found the markings "Alpha" (which I believe is the brand name) and the spec "B50K".

    The pot measures about 35mm in length.

    I called Ampeg and they no longer stock it. I've done some Googleing and I can't find the same model.

    Any help would be appreciated.

    Thanks
     
  2. p-lo

    p-lo

    Jun 18, 2010
    St. Louis, MO
    Might try these guys http://www.lselectronics.net/ and see if they can help or point you in the right direction. I believe a couple of the guys from the SLM Ampeg days still work there.
     
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  4. Bass 45

    Bass 45 Supporting Member

    Jun 23, 2011
    Tempe, Arizona
  5. JimmyM

    JimmyM Supporting Member

    Apr 11, 2005
    Apopka, FL
    Endorsing: Ampeg Amps, EMG Pickups
    Wow, now you want a rubber tip? Geez, don't be greedy!

    :D
     
  6. Bass 45

    Bass 45 Supporting Member

    Jun 23, 2011
    Tempe, Arizona
  7. B-string

    B-string Supporting Member

    Looks like a plastic automotive vacuum cap would be pretty close, at least from off stage?
     
  8. Bass 45

    Bass 45 Supporting Member

    Jun 23, 2011
    Tempe, Arizona
    Thanks B!

    With a dip in white paint, it may be the ticket.
     
  9. B-string

    B-string Supporting Member

    I have even seen them in white already in the local parts stores before. I think they were in the "Help" catalog (misc trim/special parts) most stores had that line.

    Just came to me, used for carb port caps and HVAC vacuum controls.
     
  10. Bass 45

    Bass 45 Supporting Member

    Jun 23, 2011
    Tempe, Arizona
    Thanks again!

    I will look into it soon. I think there are a couple of guys in the SVT-2 Appreciation thread who would like to know - if we find a close match.
     
  11. Did those sliders that Paul recommended end up working? I am in a similar situation with my SVT III (non-pro)...need two slider pots to be replaced.
     
  12. Bass 45

    Bass 45 Supporting Member

    Jun 23, 2011
    Tempe, Arizona
    They didn't. I ended up fabricating something - I don't remember the details -but I think it involved super glue and shaping some plastic and using the old pots.

    I did find rubber tips that may work (if you need them): Guitar Effects Pedal Set of 8 Control Knobs Caps Boss GE-7 EQ EHX Micro Synth
     
  13. Dang, well thank you for getting back to me...the search continues!
     
  14. BassmanPaul

    BassmanPaul Gold Supporting Member

    Aug 25, 2007
    Toronto Ontario Canada
    They certainly should have worked. I've used them before without difficulty! I'm distressed that the pot didn't work for you. :(
     
  15. beans-on-toast

    beans-on-toast Supporting Member

    Aug 7, 2008
    It was the correct electrical spec which is a 50K L (linear), 20mm, detent. The Ampeg part number is 70-503-25.
     
  16. Bass 45

    Bass 45 Supporting Member

    Jun 23, 2011
    Tempe, Arizona
    Sorry Paul - it was the size that was the issue. The mounting pins did not line up on the board. I had tried to use the innards from the new ones with the housing from the old ones - but I could not get it to work. I think I also tried making tiny extensions for the mounting pins - and failed there too - too delicate. I have replaced many slide pots in Ampeg's later amps - the Pro Series, SVT 350 etc. - they are readily available and easy to find and replace.
     
  17. Bass 45

    Bass 45 Supporting Member

    Jun 23, 2011
    Tempe, Arizona
    Ampeg no longer stocked them IIRC
     
  18. Bass 45

    Bass 45 Supporting Member

    Jun 23, 2011
    Tempe, Arizona
    I wonder if the supplier sent me the wrong ones?

    The details are foggy at this point
     
  19. B-string

    B-string Supporting Member

    Wasn't possible to redrill the PC Board and bridge if needed?
     
  20. Bass 45

    Bass 45 Supporting Member

    Jun 23, 2011
    Tempe, Arizona
    Maybe/Probably :(