I'm curious about whether this might be a "tweener" model since so many things aren't typical. Some quick questions and/or observations about the Fender MMB amp I bought. It even has the original jewel lamp that works! Caqn't wait to get it into the house and crank it up with the wife gone tomorrow!!!! And that when dimed they sort of "compress" but in a sort creamy distortion sort of way. I haven't dimed it yet but on another discussion site someone said they have some sort of "roll off" which was meant for rolling off the bass when using a bass guitar at higher volume. A question I have is did these have a cover over the tube area of the chassis? Doesn't look like it did but I'm curious about that. The cloth insulated speaker wires look really good too. the tolex looks used and a bit dusty but it'll clean up good with no nicks or tears and grill cloth has no tears in it either! Even the chassis looks to be in well kept shape. Amazingly the thing is very well preserved. The output transformer is small like most of the ones I've seen on the 'net too. The tube chart is definitely one from a later model with it showing the 6V6, 12AX7 configuration as opposed to the 6BQ5 type of the earlier models. I haven't dated the thing yet but I assume it around a 1974-75 or 76 model year amp. I was somewhat puzzled too seeing that the cabinet is plywood instead of the typical particle board of the later models. Tell you what, since you don't want to make the wife angry, I'll buy that amp off you for what you paid. It will probably end up being my only amp if (or most likely when) I have to sell my Champ for $$. The chassis of MMB amps and Champs are the same size, and are interchangeable, if you take into account the ohms difference (MMB = 8, Champ = 4, well, 3.2 but I'm not quibbling). I would have liked to have saved that cab, but my particle board was in better shape, and my chassis had been gone through by a very talented amp tech (RIP, Matt) and the buzz that frequently plagues these amps had been resolved. It also had the removeable baffle instead of the glued in baffle. One had the real wood cab, but alas, some rocket scientist had bolted rack ears on it at some point, and there were holes in the side of the cab. It is quite possible you have a parts amp, which is not a bad thing.
They would not necessarily overlap, as the plywood stuff would have only been the very early few years, and the separate off/on switch was some years after they had switched to particle board cabs. I'm kind of puzzled by the plywood and off/on switch combination. how can you sleep at night, knowing you robbed the poor stupid bastard? even if I tell her I didn't spend but $20 she's going to say "WHY!!! did you get another amp!!!" What'cha think about this deal? I believe that it was well worth the $20 I spent on her. It starts breaking up nicely around 7 with my strat. sounds pretty damn cool for 12 watts and is a hand wired little monster. It also has a plywood cabinet and is not the particle board version as well as a blue label Fender 12" speaker.
It has one 12AX7 and a rather weird phase inverter utilizing a tranformer? I was able to locate a schematic online. This one is the more desireable model too because it has the on/off switch instead of being in the volume pot and uses 6V6 tubes instead of the 6BQ5's. But to do that even, I would have to change the power transformer or add a small filament transformer somewhere to augment as the 40-18100 PT only delivers 1.1 amp (and it runs pretty hot even with the one 12AX7 and two 6AQ5's I used).I was wondering if anyone has played through one of these? I was able to pickup a very nice one for $20 today! The guy on Craigslist didn't know what he had because these are going for anywhere from $200 to $500 on Ebay. I too have left plenty of room on the board for further modification but, in my case, because I started with a little Acoustic G-20 as the donor amp, my chassis would be the more limiting part for me to expand should I later decide to redo with added tubes (as well as the space around the speaker when mounted in the cabinet).
#Fender musicmaster bass amp mods driver
I built one last year, but mine was only slight modded from the original, So I used the solid state rectifier and the replacement transformer set for the Musicmaster from Classictone (PT = 40-18100, OT = 40-18101, Driver = 40-18093). What power transformer is being used? I see that you have modded yours using a different one as you have switched to one that supports a 5V rectifier tube.
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