#Fender musicmaster amp driver
I haven't found the limit of the interstage driver transformer which means I haven't melted one yet. However, the greater input sensitivity of 6BQ5s makes an EL84 MMB a raging beast by comparison. 18 watts "on paper" isn't quite double the "10 watts" the stocker makes. Seems to me the 6AQ5 version lends itself readily to a 6BQ5 conversion.
#Fender musicmaster amp full
The full package includes 450v filter caps and a 250 ohm bias resistor. Stick a cheapo aftermarket Champ transformer in there for a useful 30%- 50% increase in supply voltage. so that's the quick way to wake up a 6V6 MMB. It's even a Schumacher transformer in there! Same deal with the old Sonar tube CB I have under the bench. It has 320v on the plates with the tube rectifier likely to rise to 350v or so with the MMB's SS recto. I have a hi-fi amp that used 2x EL84s and a 6X4. Of course 5v pilot lights are an andyfromdenver trademark. I'm picky about extra wires so the redundant 5v leads bother me. We go from too little voltage to too much. That's what Fender did in the Princeton Reverb. Sure, you could swap in a Champ transformer. When jonrpick showed up with his empty chassis I searched the dungeon for a more useful PT. That's a switch! Usually everyone else copies Fender. for 6AQ5s but wimpy for 6V6s.īTW, the whole thing is a rip of an obscure mid- '60s Gibson amp. It's something like 240-0-240 70ma (or so) yielding 290v at the first filter and on the plates. The power transformer is the weakest link on the MMB. Heck, I have an old Hammond organ in storage with 6AQ5s between all the black keys! I'm not kiddin'! O.k., there may be a few 12AX7s between some of the keys.
Point is I have a set of Hewlett-Packard labeled 6005 tubes perfect for a MusicMaster Bass amp. My "Probably Never" stash is 100 miles away. My "Someday" stash is right down the cellar. I wish I'd heard about this before the last time I was rummaging around the stash I have in deep storage. 6AQ5s and 6V6s act exactly the same at the same voltage. Methinks a pair of spent 6AQ5 tubes are primarily responsible for the behavior of your MMB. Other moral, maybe the 6v6 version is better.? If you must drill, make it look like you did it at the factory I guess. I'm pretty proud of my no drill holes for the recap, and single hole for a fuse. I'll point out what's been done for reference. Moral of the story, anyone else have a similar experience? I also know guys like to tweak this in the MMB Mafia thread, I would gladly go extreme if it were what was wanted (changing tone stack, adding a tube (another rabbit hole for sure) and loosing the transformer. Leaving it alone as it seems like a rabbit hole of tweaks and I don't want to waste time. I decided to put the input cap (.005) back in and it's much better. Tried the same on the 6aq5 version (scheme pics attached) and it sounds soooo bad and bright/harsh/brittle (the power tubes are not matched well either). Still wasn't so shrill (without the input lowpass) that I wanted to die. Then an increased capacitance cathode bypass on the 1st triode, maybe second too. 005 cap on the inputs and wire it Fender style w a 1meg on the jacks and loose the 470k. This is the third MMB I have recapped and maintained.
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