Marantz 2330b report
I can't believe how slow I'm getting back to old projects. I aquired an old 2330b that had been gathering dust in an older tech's garage. He said that the output transistors were gone , yes , they sure were. I replaced them with MJ 15024/25 after recommendations from the forum. Receiver fired up but one channel ran hot. Put it back on a shelf for a few years and decided last week to repair it or sell it. The problem was traced to Q708/Q738 where the idle current is set. Replaced and problem solved. Runs cool and sounds great. Curiously the driver transistors were all fine, first time I've seen this.
I just posted this if anyone else runs into the same problem. I have gleaned so much help from this board over the years.