Classe CA 200 (heatsinks on the sides), I used to run one with a Audio Research LS-3 (non-balanced version) w/SL-3's with really, really nice results. Both pieces can be had very rea$onably too, cheers..
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Wkjeffers, lots of amps will be good or bad depending on impedance, and because the SL3s go down to 1 ohm, they will test a lot of amps. Having used an amp which could deal with it on my SL3s and an amp which couldn't, I highly recommend amps which can!
I did not own one but I tested one before making the decision to go with big power tubes and I can recommend the Innersound ESL amplifier. I also liked the way Counterpoint hybrid/FET designs sounded with the SL3s.
FWIW, a friend of mine is thinking of pairing a McIntosh integrated with a pair of SL3s (without listening to it beforehand - aaargh). Is there something particular to McIntosh which would make them a bad match with SL3s? My understanding is that the input impedance goes low enough, and I am surprised by the OPT comment, because I had not found OPTs to be a problem on my tube amps. Indeed, they smoked almost anything else I tried.
If others have experience trying McIntosh amps/integrateds with SL3s or similar MLs, please help Wkjeffers, the original poster, because it will help me (warn off a friend if bad) as well.