The only one I did was to add a midrange knob to mine. If you want to mod the amps there are a ton of variations you can do to them. Having a 3 band EQ lets you get those tweed tones. The reverb and the tremolo do run on tubes which is likely the reason the bandmaster is rated 10W less then the Bassman. They added reverb to the silver face versions in the 70's and doubled the head cab size to accommodate the reverb tank. Most band masters only had tremolo in the beginning. I've owned a Blackface bassman since 67 and its essentially the same amp minus the reverb or tremolo. Someone may have taken out the solid state and installed a tube but that's allot of work for nothing. Not sure where you're getting your info but the bandmasters did not have Tube rectifiers. the non Reverberating heads and the Reverb versions before and after 68-75. The same sources say all of the other Bandmasters had a Solid State Rectifier. The published specs say the Bandmaster Reverbs between 68-75 had Tube Rectifiers, at least those listed on Fender Guru and a couple of other spots online. FWIW it is trivial to mod a BMR to Class A at 15-30 watts depending on output tube choice. That works great and is ultra simple and reliable. that coupled with a decent PA can play anywhere with sufficient headroom.for solid cleans and natural overdfrtive that won't melt your face. Personally I opted for a Class A 30 watt power section and tilt back legs placed in front of me angled up at my face, turning it into essentially a stage monitor. It's far easier and more reliable to provide a PreAmp Out and switch between internal and an external power amp but of course that requires 2 speakers. I've modded amps like this before but making it instantly switchable can reduce its roadworthiness just by introducing critical switching. Some of that has to do with increased voltage and current levels but impedance matching is one more serious issue that needs to be addressed. Power amp switching is by nature more complex and expensive as well as slightly more risky in 2-tube output. It isn't difficult to get both channels working with one reverb section since that is all signal level operation where one only has to be cognizant of phase relationships, especially if both channels can operate simultaneously. That would sort out most of my Fender wants in one box, and save me the hassle and cost of owning a DR or Princeton *and* the BMR, and anything that saves that hassle is a good thing. What do you think? Would that or something very similar work? Dirty/Breakup/~20w on Channel 1, and Clean/Headroom/~40w on Channel 2, each with Reverb that has both Dwell and Level added, with a Tube rectifier and Tube Reverb circuit.? I'm sort of hoping I can franken-MOD this thing and end up with what's essentially a BMR head, a DR head (or a Princeton equivalent, maybe), and a Standalone Reverb unit all in the one big head case that the Bandmaster comes in. Would it require a unique Transformer for each side? Would the impedence be the same in both modes? Also, what about adding the Dwell and Level controls to the Reverb circuit like those in the standalone Fender Reverb units of the era? I wasn't familiar with this model before last week, and in the brief reading I've done it seems quite similar to a Deluxe Reverb (w 6L6s), which has me wondering whether one could modify Channel 1 of the Bandmaster Reverb to essentially be a Deluxe Reverb? I'm considering picking up a '69 Silverface Bandmaster Reverb (head, with a Tube rectifier I believe) from a friend of a friend as an alternative to the other newer 40w variants like the Blues Deluxe and its Reissue, or the Hot Rods, etc, for my main Clean sound for non-Baritone guitars.
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