[EdHolland]

Good project Ron, I've enjoyed reading the progress so far - and look forward to the next installment. Marantz equipment is almost always worthy of saving, but projects that don't stay fixed are taxing.

A couple of years ago, I came by a Dynaco ST400. One channel was kaput, so I went about recapping the driver boards, replacing all the driver transistors, and the outputs. It worked like a charm until next morning, when I was greeted with "Kapow!" at switch-on. The cause was the collapse of the plastic bushings used to mount the driver transistors to the heat sink. That was the sound of a fairly inexpensive project getting more costly. Time to do replace all the drivers and outputs again... with new bushings. This fixed the issue, although I have yet to find a use for this nice amplifier.

I wish you well, and hope you are soon back at this project.

Cheers,

Ed