Are Dumbles "based" on any particular amp?

Discussion in 'Amps and Cabs' started by CitizenCain, Feb 17, 2008.

  1. CitizenCain

    CitizenCain Member

    Messages:
    4,831
    Joined:
    Jan 10, 2004
    Location:
    Magdalena, NM, US
    You know, in the way that Boogies started from modded Fenders and Marshalls sprang from tweed Bassman amps, are Dumbles based on anything in particular?

    I know they have evolved into a unique circuit, but underneath is there a plebeian heritage?
     
  2. Blue Strat

    Blue Strat Member

    Messages:
    30,033
    Joined:
    Aug 2, 2002
    Location:
    Sterling, VA (not far from Washington DC)
    Dumbles started out as Fenders but changed radically. The power supply is very beefy with solid state rectifier and lots of filtering and the tonestack is very unique. The design also uses "cascaded stages" to produce preamp distortion. Not completely unique, but not exactly the same as other designs.
     
  3. wichita

    wichita Supporting Member

    Messages:
    8,171
    Joined:
    Jun 6, 2002
    Location:
    AUSTIN
    All from General Electric and Fender I think just like everything else including Marshall...right tech guys?
     
  4. wingwalker

    wingwalker Fuzzy Guitars

    Messages:
    6,796
    Joined:
    Jan 1, 2007
    Location:
    Atlanta GA
    They are indeed based on BF Fender amps...bigger ones like a Dual Showman or a Twin Reverb, however they are changed a good bit in all fairness.
     
  5. Ray Gianelli

    Ray Gianelli Member

    Messages:
    1,343
    Joined:
    Mar 19, 2005
    Location:
    South Florida
    Quite a few designs were lifted right from tube reference manuals. I believe some Fender designs were. And Marshall started out copying Fender. It could be that the granddaddy of all tube amps is Western Electric :)
     
  6. big mike

    big mike Moderator - EL34 Emeritas Staff Member

    Messages:
    24,074
    Joined:
    Oct 31, 2003
    Location:
    NorCal Bay Area
    Yup. Everything is on the western electric and early tube manuals.

    But my understanding is also that the D amps were evolved of the fender circuits. I know the Marshalls were.
     
  7. PFunk

    PFunk Member

    Messages:
    933
    Joined:
    Dec 11, 2007
    I thought that I read once wherer Mr. D coated his circuits in some kind of black epoxy as some type of concealing shroud.
     
  8. Blue Strat

    Blue Strat Member

    Messages:
    30,033
    Joined:
    Aug 2, 2002
    Location:
    Sterling, VA (not far from Washington DC)
    This is true. The preamp/tone stack circuits are "gooped". I don't think you'll find these circuits in tube manuals.
     
  9. bosstone

    bosstone Member

    Messages:
    3,405
    Joined:
    Feb 5, 2006
    Location:
    Oakland CA
    They are "gooped" so no one can see and copy the circuits.
     
  10. Axekisser

    Axekisser Member

    Messages:
    1,160
    Joined:
    Dec 16, 2006
    Location:
    Sunny Buffalo!
    Even while Dumble copied other's circuits!
     
  11. big mike

    big mike Moderator - EL34 Emeritas Staff Member

    Messages:
    24,074
    Joined:
    Oct 31, 2003
    Location:
    NorCal Bay Area

    No, but the inspiration started there Im sure.
     
  12. bosstone

    bosstone Member

    Messages:
    3,405
    Joined:
    Feb 5, 2006
    Location:
    Oakland CA
    Those circuits are ones he felt were ones he designed or significantly improved.
     
  13. dspblues

    dspblues Silver Supporting Member

    Messages:
    2,189
    Joined:
    Sep 18, 2006
    Location:
    Chester, NY
    The other interesting part of this is that every Dumble was different and tuned for the owner and what they wanted. All the Dumble cloners or Dumble inspired builders probably have a different Dumble in mind when they try to reproduce or build off that tone. So, the ear of the builder is pretty important.
     
  14. Blue Strat

    Blue Strat Member

    Messages:
    30,033
    Joined:
    Aug 2, 2002
    Location:
    Sterling, VA (not far from Washington DC)

    The inspiration for almost everything starts with the basic theory (which is what is contained in tube manuals).
     
  15. big mike

    big mike Moderator - EL34 Emeritas Staff Member

    Messages:
    24,074
    Joined:
    Oct 31, 2003
    Location:
    NorCal Bay Area
    Right.
     
  16. CitizenCain

    CitizenCain Member

    Messages:
    4,831
    Joined:
    Jan 10, 2004
    Location:
    Magdalena, NM, US
    Interesting stuff, guys. I was thinking about doing up an amp that has that rich Dumble-style OD but without all the bells and whistles like multi-channels and 3-way bright switches :rotflmao

    Or, is that the essence of the Dumble, the almost infinite tunability of the thing?
     
  17. Kelly

    Kelly Member

    Messages:
    2,681
    Joined:
    Jan 6, 2008
    Location:
    NC
    Based on Bic Mac secret sauce...
     
  18. dorianadams

    dorianadams Member

    Messages:
    587
    Joined:
    Aug 14, 2007
    Location:
    East of Eden
    Very loosely speaking on a much covered subject

    SSS and Dumbleland..... Ampeg SVT based.
    HRM mod= Hot Rodded Marshall EL34 Dumbles mostly
    David Lindleys' Amp#1 Hot rodded Black face DR
    OD....... souped up Twin Reverb
     
  19. slopeshoulder

    slopeshoulder Senior Member

    Messages:
    7,885
    Joined:
    Dec 13, 2006
    Based on Fender
    Aware of Boogie (and kiiling them!)
    Unique innovations
    Dumble, innit?
     
  20. johan

    johan Member

    Messages:
    2,550
    Joined:
    Jan 6, 2002
    Location:
    Sweden
    How about the rumour that the Overdrive Special has a Tube Screamer built in for it's OD. I've heard this from more than one source, and I know it's not true.
     

Share This Page