Uh...no.
And I wasn't suggesting you register at AudioKarma.org and PM the guy, I was suggesting you register at AudioKarma.org and start a thread in their McIntosh section -- it's fairly active. And I doubt you're the only person who wants to know.
I actually need to log in there some time soon and put a pair of speakers up for sale over there, perhaps I'll PM the guy and point him to this thread. Or I could start a thread there, and put a link to it here. I'll probably do both, so that he can answer over there, and be aware that there are some lurkers to the thread over here.
And I disagree with the assessment that 1/4" is associated with pro -- most headphone amps I've ever seen have 1/4" jacks...up until recently, what with the portable market and so on. And that includes the ones built in to my entry level CD players. But I completely agree with this: They really are like that.
L, for all I know, that information is already out there on ak.org.