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Thumb 5-string White noise!

Discussion in 'Bass Guitars' started by 72jazz, Dec 9, 2009.

  1. Leif Bas

    Leif Bas

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    OT

    Sorry if I make you disappointed Henry, but that was deliberately...
     
  2. projectapollo

    projectapollo

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    I think plug and pray was coined during the older IBM PC era, back when you had no idea if a new piece of hardware was going to work.
     
  3. 72jazz

    72jazz

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    Aha!

    Henry here! Heh,heh! Ok folks....thought plug and pray was a cool play on words (and possibly still is) I'd just never heard it!

    Florin: thanks for the info. Though two questions come to mind.
    1) Which would you prefer tonally; the older 18v set-up, or the newer one that your recommending? I'm not playing this till it's fixed, but when I initially tried it out, it was just SLAMMIN' loud. How would the tone be affected? Would it rob any of the classic Thumb tone if I we're to go with what you suggest?

    2) Is there a way to test each component in the bass with surety, to know exactly what may be at fault? Any diagram/schematic available?

    3) And per "General Specific"... the batteries we're changed and the loud hiss is still the same!
     
  4. projectapollo

    projectapollo

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    The replacement 9v MEC preamp, part number M 60023-09, is well over $500. Yikes. I think I will try to get those repalcement Op Amps mentioned earlier.
     
  5. 72jazz

    72jazz

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    Oh, my!

    Henry here! Thanks for the eye opening price quote Apollo. I think I'll also settle for the op-amps also!
     
  6. projectapollo

    projectapollo

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    I have the op amps on order. I'll let you know if that does the trick.
     
  7. Florin

    Florin Warwick Forum Administrator Staff Member

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    I think now it is time to call Tyler :)
     
  8. 72jazz

    72jazz

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    Survey says......

    Projectapollo: where did you order the op-amps from, and do you care to share what the cost was?

    Florin: who's Tyler?

    :eek::eek:
     
  9. projectapollo

    projectapollo

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    I googled the part number are vectored off to digikey.com, called them, and ordered the 2 op amps. The total cost was really low -- like $6 shipped. Shipping today. There was some confusion on one of them as they had that part # from 2 different manufacturers. I went with the ones in stock. Worth a try.
     
  10. TKrupsky

    TKrupsky

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    hey guys,

    ok, i thought i posted something earlier on this thread, but obviously not.

    it sounds like you have gone through the gaunlet here... but making sure.
    you tested all the grounding? you even made a ground loop by connecting
    all the pots. sheilding doesnt sound like an issue to me... new batteries,
    etc etc all the basics have been covered from my reading.

    its hard to say what you are hearing, but to be honest i find that white
    noise and hiss is something you will get with any preamp when the
    treble/pressence is turned up. The more you turn up, the more you
    get, especially if you are having a tv/fridge/AC etc etc on the same
    circuit. we have lots of lights in the showroom making things
    buzz all day, every day.

    if its something that is overpowering the signal coming out, i would
    say that is an issue, but getting a hiss when adding anything from
    2k and above in theory is normal.

    i will say that from time to time you can replace componants that
    have different values to minimize frequencies such as opamps, caps,
    and resistors, but you better be pretty handy with your soldering iron.

    without seeing or hearing the noise its hard for me to diagnose it really.

    good rules with active pickups and electronics with regards to most
    warwick basses.

    any time you can isolate it between pickups, its usually
    the pickup.

    if it goes away in passive mode, its in the EQ section, because
    passive mode only bypasses this section, not the complete preamp.

    is there anyway i can get some sort of sample or even have one
    of you call me during the week to take a listen? im curious to see
    what we are really talking about.

    im usually a passive guy, and i like a really bright tone, so i deal
    with noise all the time... hehehe

    so let me know...
     
  11. projectapollo

    projectapollo

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    Hi. I believe we have the basics covered. The key symptom to me is what you describe above -- the bass is just fine in EQ bypass, then a big step-up in hiss in EQ active mode, with all controls set flat. The hiss level is independent of the volume control, too!! Turn it all the way down and the same hiss is present. Turn it back up and no change in hiss level.

    A previous poster mentioned a CS solution wrt a couple of op amps. They appear to be easily accessible in the electronics package with no soldering required. Tell us to stop if that does not sound correct!! His previous quote:
    "The service center had replaced the two op-amps on the circuit board when he complained (very easy to do as they are mounted in sockets):
    TL064CN is now TL074CN
    TL062CP is TL072CN."


    Thx, again. Bill
     
  12. Grgzilla

    Grgzilla

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    I dunno about your preamps,but both basses I've had with 3 band eq's had their op amps soldered to their PCB's.
    fwiw.
     
  13. Leif Bas

    Leif Bas

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    That might depend on year of birth or model? As I posted earlier my Thumb -98 has sockets for the op-amps, the SS2 -94 has them soldered.
     
  14. Grgzilla

    Grgzilla

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    Oh sweet,that's good to know.
    Mine were/are 2003 & 2007.:)
     
  15. 72jazz

    72jazz

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    Henry's 97 Thumb-White Noise!

    Evening Tyler, Henry here! The conversation's getting good for addressing the Major hiss issue that Projectapollo and myself are having! We are describing the exact same issues with both basses! My ground was checked by my luthier also! So specifically, what is the eq section of an 18v Thumb bass comprised of? What components are included? Would they also include the op-amps that Projectapollo is referring to?

    Earlier on in this post someone alluded to the treble pot....is this a possibility?

    And to take you up on your offer to call you, I'd be willing to do that as I'm right next door to you in Southeastern Ct. How may I connect with you? What hours are you there, and thanks for your willingness to help, Henry!
     
  16. projectapollo

    projectapollo

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    Good News - Noise Fixed

    :d OK -- got the $6 parts in the mail today. Gently removed the 2 existing chips (yes, they are in sockets) taking care to note their orientation. Had to bend (narrow) the connectors a bit to get the new ones to fit the socket, then they slipped in easily. The new chips had the same "orientation dot" on them as the original chips!! Fired her up and the active-EQ (push/pull switch in the push position) noise is significantly reduced. Not eliminated, but well within what would seem normal for good working electronics. EQ-bypass still works and is still silent.

    I can plug this into a DI at church and not have the sounds guys look at me like -- what kind of crappy bass is that!!! (I like to use the active EQ because, as a former sound guy, I know most sound guys really don't bother with the bass EQ much, so I like to be able to do some basic tone shaping from the instrument.)

    Thanks, so much, for the forum member's tip on these part numbers. That was the key. A $6 repair sure beats replacing the $500 preamp in total!!
     
  17. projectapollo

    projectapollo

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    Thank you!!

    Lief -- excellent excellent Warwick community help on this fix. We owe you one.
     
  18. Leif Bas

    Leif Bas

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    Glad to be able to contribute! :d
     
  19. Florin

    Florin Warwick Forum Administrator Staff Member

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    Good news man!!!
     
  20. 72jazz

    72jazz

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    A Big thanks!

    Leif Bas/ProjectApollo: Henry here; thanks for all your help; and P.A., from where did you order your parts? From the Hanser Music Group? And if so, who may have been your contact person there? So that with ease I may acquire the same parts. Did you also order the exact same op-amp part numbers? Thanks, Henry! And a happy New Years to all!!!!
     
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