I would call up McIntosh, parts department, and plead for a set of new smaller tubes. See if they can send it out to you without asking you to follow through on all the warranty BS you gotta go through. Had a problem with small tubes and one was bad and it solved all my problems.
McIntosh Tube Amp will not come on.
I have a fairly new MA352 integrated 200W tube amp/ SS Preamp. In the middle of the day, during normal operation, I powered it on, but the 4 tubes stayed orange. They will convert to a green "ready" state. The display just continues to say, "Tubes warming up." This phase of start-up lasts about 5 seconds. Now... It will not get past that phase. Has anybody else experienced this with McIntosh tube equipment?