dubkitty wrote:now, there's the very definition of a niche product. not that there's anything wrong with that. but i don't think i've heard anyone talk about Music Man amps since the 1980s. there are no doubt people out there who have experience with the originals and thus have some idea what they sound like, but all i can find is that apparently Clapton and Knopfler were into them in the late 70s. i seem to recall them also being popular with R&B groups then and seeing them in the background of TV appearances. but this is an illusion in a riddle wrapped inside a mystery to me. i haven't the faintest idea what it would sound like, or what it should sound like. i think they sound like a crunchy Twin Reverb, but without the harmonic complexity of preamp tubes. don't make me watch amplifier demos. please.
John Snyder of EAE (designer of circuit) wrote:
"Because we love a weird passion project, we editorialized our favorite parts of this cult classic into a compact overdrive pedal: The Bard."
https://www.electronicaudioexperiments.com/pedals/bardOne of the people working at EAE has his own pedal-thing (Nerd Knuckle Effects) that used to make an HD preamp that John Snyder designed.
It has been an ongoing interest. So whether it's niche or not, people can also see the schematic (available until February 2024) on the EAE website.
https://www.electronicaudioexperiments.com/schematicsMusicman HD Series PreampSimple op amp preamp inspired by the MusicMan HD65, HD130, etc. The topology looks a lot like a Fender preamp, with impedances scaled to suit op amp operation rather than vacuum tubes. These amps are known for their clean tones, but the trashy op amp distortion is in a class of its own. Any dual op amp which is pin-compatible with a TL072 should work. A "bad" op amp like an LM1458 might actually sound better at high gain - the originals used LM307 op amps which are close to the LM301 in design. The original also runs the chips at +/-16V which is possible but takes up a lot of PCB space, so this one uses a charge pump for +/-9V bipolar operation and the gain is reduced slightly to mitigate clipping at the input. Layout verification is pending. (Schematic
https://static1.squarespace.com/static/56a5a0e242f55268768a0c2b/t/59275264be6594ad0823dc71/1495749220225/MM+HD+Pre.png).
Email verbiage about The Bard:
"We are releasing our latest pedal, The Bard. This is an adaptation of the cult classic Music Man HD130, an amp known for its pristine cleans and trashy overdrive. We adapted our favorite parts into a versatile new overdrive/preamp pedal that works equally well in front of an amp or on its own. The Bard traverses between both classic and angular sonic territory in a way that is unique in our lineup. It’s a charismatic crowd pleaser, just like a bard ought to be. (The lute is sold separately, though.)"
Manual here:
https://www.electronicaudioexperiments.com/s/Bard-Manual-R1.pdf