What Year is that one? I had a JMP 2203 Mint from 1980 & it sounded NOTHING like that Boosted. I tried different preamp tubes & power tubes, different boosts....EVERYTHING to try & get close to that tone. I finally took it to 2 different Techs & they both said "You got a dud dude" They offered to Mod it for me but i didn't want to mod it.
I eventually sold it for 1700 or 1800 to a guy that lived near me & he modded it himself & now it sounds like a Recto with the Bass turned all the way up.