Which Audio Research gears are classics?

I have listened to the SP6 and SP8 pre amps and prefer both in their original models, the B versions are bright. Also the SP11 is very highly regarded. And of course the D79 and D150 are probably the most famous and musical of all their amps.

The D79 si by far the most desirable.I use to own a solid state monster the ARC D110B which was great on bass, The SP-6B and the Preamp SP-8.
I wish I would have kept those preamp's still today.The SP-6
could warm u up nicely on a cold winter night.But I think
I would take a D79 Amp and mate it with a SP-11 Preamp and then I would be very happy on my stranded Island provided I had electricity. Happy Hunting!

The above responses are right on, I have never owned an Audio Research product I didn't like but had some that really stood out in terms of sound quality. I think the ARC LS-1 represents an excellent value for its used price but is often overlooked because there are no Audiogon reviews or posts on it. I have compared the LS-1 to the LS2 & found the LS-1 to be more transparent, with very good dynamics.

I like the D-75A, got one from a friend and restored it with 99.99% original parts. Its 70WPC and all tube, baby! Generates a lot of heat but it has been reliable; weighs a ton. Have not heard much about this amp here, but its very very nice, great sounding.

LS-17 imho. I had ls 2, ls 3, ls 7, ref 40
Currently ref 10 and ls 17