mi3491, fone # was listed in my 1st post, here it is again: 702.248.6745. ask for brant (if he doesn't answer the fone!).
the maestro updated the caps from the sha-gold, so i understand; it also replaced the pho-tentiometer for a more reliable conwentional pot. since brant bought the company, they've come out w/a few other mods for all the melos product - one of them removes some mosfets & re-circuits the wiring thru the tubes. they can also do mods on the mat-180 amp.