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EMG BTS problem

Discussion in 'Pickups & Electronics [BG]' started by rougeporn, Jan 12, 2006.


  1. Hi I have just installed a Emg Bts system into my Pedulla Rapture that previously had an Emg jazz set wired vol vol tone tone. Keeping the pickups in I wired the preamp as per instructions. stranglely though the master volume control doesn't mute the pickups but only gives maybe a 50% drop. Also theres an annoying click when i touch any of the control knobs, which would be an earthing problem? None of this happened when the pickups were wired vol vol tone tone. Anyone know whats going on?

    cheers
     
  2. dood

    dood

    Dec 9, 2004
    sitting down,facingforward..UK
    Endorsements: Shuker Guitars, Dingwall Designer Guitars, D'Addario, Planet Waves, Barefaced Bass
    Yes, firstly the clicking and extraneous noise sounds like a wiring problem/bad earth. Have you used the same pots as were in the bass, or have you replaced them with the EMG ones? the could well be the wrong value and will cause all sorts of problems.

    Passive basses will tend to have pot values around 250K log to 500K log. The EMG systems use pots that are more like 25K instead. Very different and likely to be the problem.
    Check 'em out. Another thing to check, is if the BTS system is designed for Active or Passive pickups. again, this will make a difference. Were the pickups in your Ped' EMG active or EMG passive?

    out of interest, did you buy the system from bassjamm? the point i'm making was mentioned on the forsale thread.
    http://www.bassworld.co.uk/pn/index...topic&t=7657&postdays=0&postorder=asc&start=0
    have a look chap.
     
  3. Hmmmm The bass has active emg jazz pickups, and the prevoius electronics were 25k emg vol and tone pots. surely that would be a straight swap for a emg preamp?
     
  4. Would a surefire way to fix this be to get rid of the balance control and wire vol vol bass treble, using the vol controls that were in the bass previously?
     
  5. RevGroove

    RevGroove Commercial User

    Jul 21, 2002
    Burlington ON Canada
    Manager, Account Services: Long & McQuade Ltd. (Burlington); MTD Kingston Basses International Emerging Artist; Bartolini Electronics Emerging Artist
    May not be surefire, but that's what I would do...all of my Spectors with EMGs are either wired that way or modded after purchase. No problems...
     
  6. I have the same click when i touch the knobs or strings on my bass as well... its driving me nuts. let me know if you find a solution please. thanks!
     
  7. have changed the electronics to vol vol bas treble, alas exactly the same problems, so it must be a problem with the preamp then, bugger.
     
  8. ehque

    ehque

    Jan 8, 2006
    Singapore
    is your volume still not a full cut? i think you might have wired it wrongly.

    im not doubting your wiring skills here, but it sounds like you have wired your pot out-live-ground with the pickup signal on the wiper rather than live-out-ground with the output as the wiper. im just guessing, dont flame me.
     
  9. dood

    dood

    Dec 9, 2004
    sitting down,facingforward..UK
    Endorsements: Shuker Guitars, Dingwall Designer Guitars, D'Addario, Planet Waves, Barefaced Bass
    I have had a look at the instructions,

    http://www.emginc.com/downloads/wiringdiagrams/BTseries.pdf

    I would maybe go back and mark off each wire on the diagram to make sure all is in the right place, just to be on the safe side.

    Sometimes when I get stuck I go back to scratch and resolder everything. Time consuming, but then you know you have done it right..hopefully!
     
  10. dood

    dood

    Dec 9, 2004
    sitting down,facingforward..UK
    Endorsements: Shuker Guitars, Dingwall Designer Guitars, D'Addario, Planet Waves, Barefaced Bass
    Can you draw us a diagram of your layout. I'm sure we can solve it faster that way.
     
  11. Its wired exactly as emg instructs.


    http://www.emginc.com/downloads/wiringdiagrams/BTseries.pdf


    last diagram on page 4

    the only deviation being that i used the existing jack plug and battery.

    I then tried wiring it as per the diagram at the bottom of page 3, using vol pots i know to work, and the problem was the same. This is why I think theres a problem with the preamp as ive ruled out every other possibility.
     
  12. dood

    dood

    Dec 9, 2004
    sitting down,facingforward..UK
    Endorsements: Shuker Guitars, Dingwall Designer Guitars, D'Addario, Planet Waves, Barefaced Bass
    Sounds good to me. I think, if you have exhausted all posibilities and are happy that all is wired corrrectly, then, yes, you could well be looking at a faulty preamp.

    I guess if you wanted to be throrough you could go round each cable and pot with a muiltimeter to make sure there are no odd open cicuits, or that the values of the pots measure up? um.. just trying to think of other posibilities.. how about making sure everything that needs to be earthed is electrically sound.. again, look for open circuits or incorrect readings? um.. battery?

    I hope you are able to sort it friend...
     
  13. luknfur

    luknfur

    Jan 14, 2004
    DIXIE
    FWIW:

    my guess is that it's either something in the wiring or the pot. In my experience preamps either work or they don't. Apparently it works fine except for the volume control. That doesn't sound like a preamp problem to me. It's may experience that preamps less than 10 years old are basically bullet-proof short of a factory defect.

    Check the pot with alligator clips and a meter and see if you get full travel from the meter needle. If you do the pot should work fine and you may have a lug improperly grounded. If the pot worked fine with the other pups it's unlikely that would change now unless the pot were toasted in connecting a ground wire. You might also check to make sure you've got an audio and pot and not a linear tone pot there.

    I just looked at the diagram, I don't know how closely you followed the rest of the wiring connections in the diagram but the system clearly calls for a 50K master volume not 25K. That could be your problem.
     
  14. The preamp pretty much came as a complete loom, i only connected the jack and pups, also i tried different pots, no change, mystery.
     
  15. luknfur

    luknfur

    Jan 14, 2004
    DIXIE
    You might try double checking the terminals on the jack. In recall the EMG jacks came with that black boot over the nuetral terminal when the negative of the battery clip goes. There was debate sometime back on TB regarding those connections and battery drainage. I doubt in will change anything but you can swapping the nuetral and ground leads on the jack. It won't harm anything cause they're both connected to the same path with the jack in place, split with it out. And I'd change them back if it didn't make any difference cuase it should cuase the battery to drain faster that way in my recall. But you're pretty much out of options except contacting EMG.
     
  16. RevGroove

    RevGroove Commercial User

    Jul 21, 2002
    Burlington ON Canada
    Manager, Account Services: Long & McQuade Ltd. (Burlington); MTD Kingston Basses International Emerging Artist; Bartolini Electronics Emerging Artist
    Actually, the EMG BQ/BT systems ship with a 50K master volume, but if you're wiring volume/volume instead, then 25K volume pots, which ships with EMG pu's, are suggested.
     
  17. yeah thats exactly what i tried, X2 25k vol pots, x 1 50k balance pot+master vol, swapping the neutrel and ground
    , no difference,
     
  18. luknfur

    luknfur

    Jan 14, 2004
    DIXIE
    I'd contact EMG
     
  19. RevGroove

    RevGroove Commercial User

    Jul 21, 2002
    Burlington ON Canada
    Manager, Account Services: Long & McQuade Ltd. (Burlington); MTD Kingston Basses International Emerging Artist; Bartolini Electronics Emerging Artist
    +1, Rick @ EMG is really cool to deal with.
     
  20. Did you purchase the Pedulla used? I ask this because as far as I know they do not offer EMG's. Which brings me to the clicking problem. Check to see if the bridge ground wire was removed when the pick up's were installed. If it still attached, that could be the source of your clicking. EMG pick up's are internally shielded, and do not require the ground to bridge. I had that problem, clicking and removing the bridge ground solved it.