Tascam M320: any good? Preamps specifically...

An older thread, but interestingly the OP never came back to discuss upgrading the op amps. Having heard these EQs I wouldn't mess with that part of the circuit (in case anyone else is researching)- they're great EQs! I don't hear any 60Hz hum in this power supply either- original caps from the 80s on a unit stored 10 years. Clearly I didn't know what I had in this mixer!