The THRESHOLD SA/1's mono blocks power amps. Perfect match for Quads & Logans. This is when Nelson Pass & Threshold were at their pinnacle.
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I owned original Quads with the Quad II power amp. I switched to Threshold SA/2 monoblocks and they sounded a lot better. I tried ARC tube powever amps and while they sounded great with the Quads, I preferred the Thresholds. Caveat though, this is 10 year old info. But, I just sold my SA/2's a few months ago and they still sounded very good compared to the current crop of amps.
Well since I own Original Quads and I'm a dealer for Sound Lab electrostats, I've had a chance to try a fair number of amplifiers with the Originals. The only solid state amp I've really liked with them is the Chord from England. Quite musical. The little 40-watt Clayton is also a strong possibility - it sounds very good driving the 63's. In tube amps, Atma-Sphere M-60's are magical in the mids but can be a touch loose in the bass. The larger models have no trouble. The little Berning ZH-270 is also very nice all around, and works quite well with the 63's also. A friend of mine builds custom 845-based SET's that are extremely sweet with the ESL's. The best I've heard them is driven by Thor 30-watt monoblocks, but that's a ten grand pair of amps. David Magnan, of Magnan Cables, uses stacked Original Quads as his reference system, driven by highly modified Atma-Sphere M-60's. I sell two of the amplifier brands mentioned.