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Music Master Bass Amp Mafia

Discussion in 'Amp Owners Clubs' started by Sidney Vicious, Nov 7, 2009.

  1. Sidney Vicious

    Sidney Vicious Friend of Leo's

    I got turned on to these by Robbie D of the TDPRI and catnine over on the FDP. Hearing two cool cats singing the praises of such a funky stepchild of a Fender amp got my attention. When I learned how relatively affordable they were/are I really got interested. 12 inches of tube tone for cheap? I'm in.

    I have gone through a few of these over the years but recently settled on this early 6AQ5 one:

    [​IMG]

    Bone stock except for the tubes - three RCA's - and, at the moment, a Weber Sig Alnico. Truth be told, for at home play the stock speaker in this thing sounded great for my low-fi hacking. I may end up going back to it.

    I have also decided to leave the tone circuit alone on this one - although I will install an in-line fuse soon to protect the trannys.

    Step up and show me yours!
     
  2. edgetone

    edgetone TDPRI Member

    91
    Oct 1, 2007
    East TN
    Nice one, Vicious. Poor man's Deluxe....I love mine.

    This one's got the 6v6's. Changed the input to a more standard "Fender" arrangement, i.e. 68K and 1Meg resistors and shorted that .047uF cap out of circuit. Sounded really good with a RI Jensen P12Q but wound up with the C12N due to the fact I noodle with a bass on it occasionally. The alnico couldn't take it, the N does fine. I've since added a 1/4" socket/plug connection for the speaker. Made it easier to hook to diferent speaker cabs and such.

    Dan
     

    Attached Files:

  3. Sidney Vicious

    Sidney Vicious Friend of Leo's

    edgetone:

    That thing is CLEAN! Thanks for posting.
     
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  5. edgetone

    edgetone TDPRI Member

    91
    Oct 1, 2007
    East TN
    She'd been around the block a time or two when I met her....
     

    Attached Files:

  6. ravindave_3600

    ravindave_3600 Friend of Leo's

    Apr 30, 2004
    Newly Indiana
    Had one - but good such a good offer on it (well over then-current value) I had to sell! Highly recommended little amp.
     
  7. Sidney Vicious

    Sidney Vicious Friend of Leo's

    Here is a good legible copy of the MMB amp schematic:

    [​IMG]
     
    Last edited: Nov 11, 2009
  8. pchilson

    pchilson Friend of Leo's

    Age:
    58
    Aug 23, 2007
    Arkansas
    Here is an original schematic for a '74 6AQ5 version MMB
    Kinda wish I still had mine...

    [​IMG]
     
  9. Sidney Vicious

    Sidney Vicious Friend of Leo's

     
  10. varakeef

    varakeef Tele-Afflicted

    Sep 7, 2007
    Finland
    Here's mine lurking in the right upper corner... it's a modded version with EL84's (or 34's... how to remember that?)
    [​IMG]
     
  11. Sidney Vicious

    Sidney Vicious Friend of Leo's

    Nice rig, varakeef. The 6AQ5 model, right?

    Aside from the feet and tone knob, any other modifications?
     
  12. varakeef

    varakeef Tele-Afflicted

    Sep 7, 2007
    Finland
    I think it is 6AQ5, 1974 I guess.

    It's modded to use different tubes (EL34/84?) since the ones they normally would use were hard to find here when the mod was excecuted (in the early nineties). They probably still are.

    I have no idea what the mod exactly is, I just know what tubes to stick in there.
     
  13. Sidney Vicious

    Sidney Vicious Friend of Leo's

    I believe the 6BQ5 is "close" to the el84 and so that is likely the tube it was modded to accept. '74 sounds right. Cool amp.
     
  14. pchilson

    pchilson Friend of Leo's

    Age:
    58
    Aug 23, 2007
    Arkansas
    These are very different tubes. I would guess they modded to the EL84.

    Only one type would fit the socket.
     
  15. endzone

    endzone Friend of Leo's

    Jan 2, 2006
    Louisiana
    Here's mine. Yeah, I'm in the happy camp with MMB's. They are little tone monsters. I picked up an old '65 Jensen P12R for this one and it really stepped it up. This thing will really grind with a P-90. I found this amp at an old obscure flea market about a year ago for $40.

    [​IMG]
     
  16. varakeef

    varakeef Tele-Afflicted

    Sep 7, 2007
    Finland
    Yep... and I have a tube chart glued on the back of the amp where the right type is printed on. So I know but I just can't remember that kind of info by heart. The flaws of human brain. :D
     
  17. pchilson

    pchilson Friend of Leo's

    Age:
    58
    Aug 23, 2007
    Arkansas
    I hear ya! Use it or lose it...
     
  18. doggy1972

    doggy1972 Tele-Meister

    166
    Aug 1, 2008
    Sheffield, UK
    Heres mine
    [​IMG]

    [​IMG]

    [​IMG]

    The pictures are a bit limited I'm afraid. Sounds good with all my guitars. Its all stock except for the tubes. 12AT7 for home use 12AY7 for louder situations
     
  19. Sidney Vicious

    Sidney Vicious Friend of Leo's

    Sweet rig, doggy - I'll have to give that tube swap a try - I think I have a 12at7 around here someplace.
     
  20. doggy1972

    doggy1972 Tele-Meister

    166
    Aug 1, 2008
    Sheffield, UK
    Thanks Sid. I love this little amp. On the lookout for another 1. I know some ppl will say that the 12at7 is a power tube and shouldnt be used for the pre but, it just sounds the best out of the 12ay5, 5751 Ive tried in there.
    A question to those in the know- Are those square CTS speakers Alnico or ceramic?
    Just a little curious

    Ian
     
  21. Sidney Vicious

    Sidney Vicious Friend of Leo's

    The square magnet on your amp is ceramic - as I believe was stock on all the MMB amps - although some - Oxfords I believe - have a round ceramic magnet.
     
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