New McIntosh MA252

I remember reading in the MA252 manual about giving the speaker terminal nut an extra quarter turn after snugging it up but I didn't want to force it, so I left it like that. If I were in your shoes and it bothered me that much, I'd contact McIntosh to see if they've dealt with this before. The only issue I would wonder about is if the terminal needs to be tightly bonded to the chassis for grounding purposes.

Thanks for the input route-66.  I contacted McIntosh and they directed me to a local technician.  I was going to call him but decided to take a peek under the hood.  It was simple.  The nut that should have been "squishing" the lock washer, was almost at the end of the bolt.  Probably another rotation and a half and the nut would have fallen off.  So a 9mm ratchet did the trick.  All is good.

I was going to suggest that you pop the top off yourself but I didn't know if you'd be comfortable doing that. I'm glad that you were able to take care of it yourself and won't be losing sleep over it tonight. :-D

I tried it with Focal Kanta 2's.  It's all solid state sound.  Even the dealer said he thinks they just put the tubes in there for looks.