If you want to read about the Sun SET amps, then go to the Triode Guild website. There are several articles and discussions about it there. Harvey loved them. They are the best selling SET amps in Japan.
Other possiblities would be the Jeff Korneff 2A3 amps, a Fi 2A3 amp, or maybe even a used Wavelength amp. All of these are very good 2A3 amps. Some of the best.
Also, don't disregard the possibility of a used David Berning Siegfried 300B amp. The ZOTL configuration gives alot more extension and detail than what anyone would expect, and could compete in detail with any 2A3.
Other possiblities would be the Jeff Korneff 2A3 amps, a Fi 2A3 amp, or maybe even a used Wavelength amp. All of these are very good 2A3 amps. Some of the best.
Also, don't disregard the possibility of a used David Berning Siegfried 300B amp. The ZOTL configuration gives alot more extension and detail than what anyone would expect, and could compete in detail with any 2A3.