Well, I'm delighted that this thread has been returned to service by Audiogon. It has been missing too long.
As I have reported before, I have beta tested products on behalf of Audio Horizons. These products include the various DACs, line level preamps, wire, and now I can report, a tube power amp.
The power amp I tested is a low watt SET. It is a functional unit but not in the final cosmetic form. I listened to it for about 3 weeks and returned it to AH yesterday.
I loved it and expect to buy one when it reaches production. I don't know when that will be. Based on my observation of other AH product development, cosmetics take time for Joseph to sort through. I won't expect this amp to pop out right away. A functioning unit doesn't translate as quickly as I would wish into a final product. If the past is an indicator, Joseph will continue to play with the circuit and layout, too. I don't want to raise your hopes prematurely - but the amp does exist.
My loudspeakers are 92dB efficent and high impedance - Coincident Technologies Super Eclipse III. Played through them, this amplifier delivered rich detail, tonal balance (consistency, if you will) from top to bottom of the audio frequency, airy top end, and solid tight bass. Sound stage was deep, and with good quality recording, there were no obvious boundaries to it.
I have had a number of fine solid state and tube amplifiers in my system over the years. This one is the best yet in my system.
As for details about the amp itself, it is under development by Joseph, and it is not my story to tell.