The college radio station where I DJ has a pair of Mackie MR8 powered monitors in the aux production studio. They look to be the original vintage, with some sort of ragtag discrete amplifier for the woofer section. They have hum problems, so we'll be recapping as a matter of course (the original caps were doo-doo). HoweverI want to understand the guts a little better, and the only schematic readily available is for the Mk3, which has ICs for both woofer and tweeter amps. Does anyone know where I can find a schematic for the original MR8? The whole setup looks bargain-basement, with liberal use of 4558s in the filter section, if I can trust the Mk3 schematic as compared to the original.