Kevin. First choice is Aesthetix, particularly the new Calypso at $4500.00 retail. It offers (perhaps) 75% the performance of the Callisto in a smaller package and includes the ability to run single ended or balanced with remote control.
I also see an Audio Research Ref 2 (not MK2) here at Audiogon in the used ads. I like this earlier version because you can swap tubes. The later (MK2) version is limited to the 6H30 Russian Mil tube. Both these are good units and run balance and single ended, both are less than 5K and offer good reliability and customer service.
I also see an Audio Research Ref 2 (not MK2) here at Audiogon in the used ads. I like this earlier version because you can swap tubes. The later (MK2) version is limited to the 6H30 Russian Mil tube. Both these are good units and run balance and single ended, both are less than 5K and offer good reliability and customer service.