Hey @decooney, no MD did not offer me a 30 days to resolve with Cary, but that's not a bad idea. I might try to ask them before I ship the unit to Cary.
As with shipping cost, neither Cary nor MD would cover it. To MD, this is a custom order, which technically is not returnable. To Cary, I didn't buy it from them, so they definitely would not cover shipping. I had already asked Cary if they would replace the unit, and they said no, for that same reason.
The current thinking of the Cary tech support person is something related to the tubes, because it wasn't seated properly. I think is probable, and I hope it's a minor issue. But as I mentioned in one of my earlier posts, if not inserting the tubes properly can lead to system failure, then it is a poor design, but I'm not an electrical engineer so maybe this is typical of tube pre/power amps.
BTW. is there anyway I can visually check if a tube is bad or not? Just curious.