John East Musicman Pre problem

Discussion in 'Pickups & Electronics [BG]' started by tonymcbony, Dec 13, 2012.

  1. tonymcbony


    Mar 21, 2006
    Hi folks,

    got a bit of a conundrum with my John East Preamp in my Stingray.

    The treble knob, when fully cranked, buzzes like crazy, like there's voltage going across it or something. The weird thing is that if you back off slightly, it disappears completely and the rest of the range is fine.

    Any idea what on earth this could be?
  2. 4-string

    4-string Supporting Member

    Jul 23, 2006
    Have you tried asking John East himself? IME, he is very helpful and responds to emails swiftly.
  3. tonymcbony


    Mar 21, 2006
    Yeah, just sent him an email, just wondering if it was an easy fix that someone on here had already encountered
  4. SGD Lutherie

    SGD Lutherie Banned Commercial User

    Aug 21, 2008
    Bloomfield, NJ
    Owner, SGD Music Products
    It might just be boosting noise being picked up by the pickup or wiring. Is the bass shielded?
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  6. tonymcbony


    Mar 21, 2006
    I think it's shielded, I'll have to check. It's kinda weird that it's only at the very top of it's range; it almost acts like a switch, full on = big hiss, roll back very slightly and it disappears.
  7. John East

    John East Commercial User

    Jan 10, 2002
    Oxford UK
    Owner of E-Pro & East UK
    I emailed you ref this issue, did you get my email?
  8. tonymcbony


    Mar 21, 2006
    Yes indeed, thanks John. Nice of you to comment here as well (I made this thread before I emailed you).

    Problem lay between soldering iron and chair...