Russ69,
They sound pretty good, but the rebuilt amp runs much hotter than the older non-rebuilt amp that has the missing heat sink. When I first got these amps they had mismatched parts then I asked the dealer to match them up and so far they look a little better from a parts perspective but I don’t know enough to notice right/wrong on the internals. I’m having a friend/tech coming over tomorrow to check the bias and DC offset as well.