PA amp for harp?

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I am looking for a schematic for a MAAS model 500 amplifier, and any sites 
with useful info on converting PA amps to use for instruments. This one 
has 4 6L6 tubes, 2 rectifier tubes, a 6V6, several preamp tubes, and 
monstrous transformers. The mic inputs have four pins, kind of like this * 
T  T *,  2 flat one way and 2 the other way. Any help is appreciated.

kcmojoe