Update; I have had the DMC600 for a month now, and I think it is pretty close to being broken in and stable. I am pleasantly surprised that the new unit sounds as good as my old 306/200. I was worried because the DMC600 was not the SE version and the 306 was the top of the line for the time period.
I have put my 306 up for sale as I don't have the skill to repair it.
I have put my 306 up for sale as I don't have the skill to repair it.