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Misterious Peavey t40 phase switch

Discussion in 'Basses [BG]' started by IguanaFish, Apr 6, 2020.

  1. Hi guys!
    Well im in a weird position right now.
    I acquired a Peavey t40 a few months back, it had a lot of problems but i really liked it in the end.
    But the most annoying one is one about the misterious phase switch.
    This phase in/out only works when both pickups have the same volume and same tone
  2. ejaggers

    ejaggers Supporting Member

    Aug 18, 2009
    Fort Worth, tx
  3. dramatwist


    Sep 27, 2019
    Played a T-40 for several years... switch never seemed to do anything... same with a Ric 360 guitar in the 60s... it had a little nob that was useless...
  4. Jackcrow

    Jackcrow Supporting Member

    Jul 10, 2017
    North Dakota
    I have a T40. The phase switch is most noticeable with both pickups on full. But I believe I read somewhere that the phase switch changes which coil of each pickup is on when you have it switched to the neck or bridge pickup. IMO it does affect the sound other than just when both pickups are on full. I think that it is actually the least useful time to use the phase switch.
  5. JTE

    JTE Supporting Member

    Mar 12, 2008
    Central Illinois, USA
    That's exactly how a phase switch will work. When you reverse the phase of one pickup relative to the other anything that is identical in both signals is cancelled. Given the distance between pickups on a T-40 that means frequencies with a wavelength the distance of the two pickups get canceled giving it a thinner sound. BUT if one PUP is set louder than the other the effect is minimized because the signals aren't identical any more. That's how it works.
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