AGD Duet Monoblocks

I have had the AGD Gran Vivace MkIIIs for a couple of years (replacing tube monos), which I just recently upgraded to MkIV status. $1500 for the tubes and $400 for the new power supply boards, resulting in basically a completely new pair amplifiers operating at the level of amps at a fundamentally higher price point. Alberto is the real deal as are his components. My Fyne 703s are 94 percent efficient, and the AGDs are absolutely dead-nutz quiet into them...

Some resounding endorsements, thanks.

Hi @lance348 , I don't have experience with the Duets but I have been using a pair of Audions in my system for 3 years now. You asked about clarity, microdetail, and imaging. In my system (Avantgarde Duo) the AGD amps deliver this effortlessly and without any strain/edge. I was a long-term advocate of valve amps but since moving to the Audions I doubt I'll ever go back or to Class A or A/B. 

In my system the speakers are very efficient and any noise from the amps is distracting. The Audions produce no noise even with my ear right up to the horns. I believe Alberto's design principles mean that the signal is amplified with a sort of purity that only the very best amps deliver (but sometimes with some residual hiss/noise).

The other benefit with Class D amps is you can leave them on all day/night without worry energy consumption. It's 32'C here in UK and most of us don't have aircon. I wouldn't have been able to listen in comfort with my previous valve amp due to the heat it produced.

Finally, in my experience, Alberto is a true gentleman and enthusiast. He has always responded to anything I've asked even when it's been obvious I don't have anything like his technical knowledge!