I don't think this amp would be any good for Bass, but it's a great small guitar amp. You'd need a pedal if you wanted buzz or gain, and it responds well to pedals (my friend is the local Fender dealer so his shop has lots of toys to experiment with). The thing is actually usable at small gigs. It's actually loud now and has great low gain tone. We slapped in an old Jensen P12Q that came out of an organ and holy shit! HUGE improvement, night and day.
The problem was the stock CTS ceramic speaker with a real dinky magnet. And those 6AQ5s are cathode biased.Īt first it sounded weak and very wimpy. Phase inversion for the push-pull 6AQ5s is handled by a transformer. Three tubes, a single 12AX7 and the pair of 6AQ5s.
If that doesn't work, I'll give the shielded wire a shot.Any of you guys ever seen one of these things? A buddy of mine just had one given to him. When my extra wire arrives, I'll try using a longer length and routing it out towards the input jacks and around the board. So at least I've localized the issue a little more.Īs it is in the above photo yields the quietest results.Īs far away as possible from those transformer wires is definitely the trick. The volume of the hum is now controlled pretty much exclusively by that wire from the volume pot going to the preamp tube. The way the transformer wires are now, they don't affect the volume of the hum when moved, jiggled, prodded. May have lessened a little bit, but not near enough to say its fixed. These also make for great little recording amps for electric guitar, giving a unique texture that other small silverface amps don't offer. As simple as can be, with just a volume and tone control for treble frequencies, the Musicmaster Bass Amp makes a fine home practice amp if you're in need of some good amount of fuzzy vintage tones. Hum is still there with this configuration. The Fender Musicmaster Bass Amp is a 1970s silverface combo amp designed to pair with the student-level Musicmaster bass guitars of the day. I snipped that sucker literally seconds after taking the above photos.įuse holder and 1amp slo-blo are on the way along with a few lengths of wire.Īlso slightly rerouted the wire that went from the preamp tube to the volume pot. Not looking for dead silence with this thing, but would like to be able to put a mic in front of it. My first guess was a cold solder joint where the group of transformer wires meet the board, but after moving those wires around some, it seems that its their location relative the the things around them that are most culprit.Īnyone here able to tell me what might be going on here?Īnd of course, what the simple fix is. So at least I've found the area that seems to be creating the bulk of the problem, however, I don't know if the hum is going away because the wire is being pushed against the caps, or because its being pushed away from the volume pot. I was able to wedge the group of wires behind a small bolt in the chassis to hold it in place this way. If I push the wires away from the volume pot and up against the two big caps on the board, the volume of the hum drops considerably. Should be noted as well that the wires are also close to the volume pot just before they attach to the board. When those three wires are floating in the space between the transformer and board/caps, the hum is at its loudest. All looked clean and tight, but was able to pinpoint at least a good portion of the hum cause to the three wires going from the transformer to the board. Pulled the chassis to investigate the hum hoping to see something obvious. The amp has had a recent recap along with a tone stack mod. Loud enough that I call it more of a buzz than a hum. Just received a 6v6 version Musicmaster Bass Amp.
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