Is anyone able to identify this preamp?

Discussion in 'Other Guitars, other instruments' started by guildguy516, Feb 16, 2021.

  1. guildguy516

    guildguy516 TDPRI Member

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    I currently have a guitar on the workbench that hasn't seen the light of day in 30+ years. I opened it to find this preamp(?) mod. Does anyone know who made this and/or a schematic of it? Thank you in advanced! 20210216_203144.jpg 20210216_203243.jpg 20210216_203214.jpg
     
  2. DougM

    DougM Poster Extraordinaire

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    It appears to have been made by Howard Dumble or Bill Finnegan
     
  3. Dan German

    Dan German Doctor of Teleocity

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    Or Lindt.
     
  4. guildguy516

    guildguy516 TDPRI Member

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    Do either of you have any more information on this type of circuit, or at least resources that talk about them?
     
  5. David Barnett

    David Barnett Doctor of Teleocity Ad Free Member

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    What did it come out of?
     
  6. Blues Twanger

    Blues Twanger Tele-Afflicted

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    Can't really say what type of circuit it is with the goop on in. We could make guesses what the covered components are but that's not diagnostic.
     
  7. guildguy516

    guildguy516 TDPRI Member

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    Anyone have any recommendations how to clean the goop off?
     
  8. Mouth

    Mouth Tele-Afflicted

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    There's a 1978 Ernie Ball Stingray preamp on ebay that is coated like that.

    Maybe some Ernie Ball instrument?

    Do you know if it's for guitar?

    If it's worth anything, I wouldn't try to de-goo it.

    Is the goo epoxy?

    If it's epoxy, I'd use end and side cutters to start nibbling off the epoxy. Jewelers screwdrivers, picks.

    That's a lot of work, and a lot of opportunity to potentially kill it.
     
  9. John C

    John C Friend of Leo's

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    Those preamps are pre-Ernie Ball; EB doesn't epoxy/coat their electronics. That's Leo-era MM preamp on ebay, and the one that @guildguy516 has certainly looks similar to the one on ebay. But it might be an MM Sabre preamp (I think they were different from the StingRay) or even an early G&L preamp from the F-100 or the G-200 from circa 1980-82 or from one of the early G&L basses - Leo did carry forward some ideas from MM to G&L after he parted ways with MM.

    From the historical perspective EB bought MM in 1984, after MM went bankrupt and was liquidated (Chapter 7 bankruptcy, not Chapter 11 where the company reorganizes with new financing).
     
  10. guildguy516

    guildguy516 TDPRI Member

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    It was in a mid 60s Gretsch that came broken in pieces, it does not look original to the guitar.

    I'm guessing it's epoxy, I had an old DiMarzio preamp that was dipped in a tar or rubber compound; it was soft to the touch and somewhat tacky. This feels hard, like plastic, and it's really heavily caked on.

    I am far from an expert on these but I did compare them to the examples you stated above: it seems to be much more primitive than any examples I could find of the Ernie Ball, Music Man, and G&L preamps. It is fairly large for an on-board preamp and it uses large components, it feels very "home-made" - if you know what I mean.
     
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