Music Master Bass Amp Mafia

Sidney Vicious

Friend of Leo's
Joined
May 23, 2003
Posts
3,606
Location
New Orleans, Louisiana, USA
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:

MMBstepsRotated_Medium_.JPG


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!
 

edgetone

TDPRI Member
Joined
Oct 1, 2007
Posts
96
Location
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
 

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edgetone

TDPRI Member
Joined
Oct 1, 2007
Posts
96
Location
East TN
She'd been around the block a time or two when I met her....
 

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pchilson

Friend of Leo's
Joined
Aug 23, 2007
Posts
3,663
Age
64
Location
Arkansas
Here is an original schematic for a '74 6AQ5 version MMB
Kinda wish I still had mine...

MusicMaster_Schematic_1152-1.png
 

varakeef

Tele-Afflicted
Joined
Sep 7, 2007
Posts
1,059
Location
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?)
teletjastyrkaritpanpienempi.jpg
 

varakeef

Tele-Afflicted
Joined
Sep 7, 2007
Posts
1,059
Location
Finland
Nice rig, varakeef. The 6AQ5 model, right?

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

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.
 

endzone

Friend of Leo's
Joined
Jan 2, 2006
Posts
2,171
Location
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.

IMGP0026.JPG
 

varakeef

Tele-Afflicted
Joined
Sep 7, 2007
Posts
1,059
Location
Finland
These are very different tubes. I would guess they modded to the EL84. Only one type would fit the socket.

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
 

doggy1972

Tele-Meister
Joined
Aug 1, 2008
Posts
171
Location
Sheffield, UK
Heres mine
Image019-1.jpg


MM2.jpg


MM1.jpg


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
 

doggy1972

Tele-Meister
Joined
Aug 1, 2008
Posts
171
Location
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
 

Sidney Vicious

Friend of Leo's
Joined
May 23, 2003
Posts
3,606
Location
New Orleans, Louisiana, USA
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

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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