Since Yamaha has been around so long then surely they must've dabbled in tube gear at some point in time; or maybe not? Most all the other Japanese audio mfgs. made tube gear I'm just wondering if Yamaha did?
Actually, Yamaha did make tube gear back in the 60-70's. Mostly guitar amps, but there was a model or two for studio/home use.
I've seen them advertised for sale just this past year but didn't grab the copy/images for posterity. One, as I recall was for a pair of old Yamaha monoblocks. Google finds some hits on them, mostly the guitar amps.
It's purely my opinion and speculation that Yamaha, given it's desire to achieve the "natural sound" gave up on tubes and concentrated on building great SS gear.
I think this thread has gotten pretty out of control based on the expected tone one generally finds on AK. Too much conjecture and sharpshooting based on little direct listening comparisons. I wouldn't say a bad word about any piece of Mac gear I had never personally heard and am getting a little tired of the Yamaha bashing by ill-informed golden-eared audiosnob gearhounds.