65 head

http://www.craigslist.org/eby/msg/762280 66.html
Any guesses as to the problem he describes?

Music Man stopped making the standard 65 series in late 1979, early 1980. The "Gain" knobs are only found on RD/RP models. The only 65 watt RD/RP models that were continued to be made past 1980 are the 112RD/RP-65 combos. It appears that this amp is a head (but maybe I'm wrong, can't tell from the poor description.)
His "preamp" problem could also be a bad output transformer or something else equally as ominous. You really can't tell what he has... it might be a good deal, it might be a boat anchor, hard to tell with the misinformation and supposition.
Steve