Need a modern Class A monoblock, preferably half or compact chassis

AGD Audion monos amps have replaced my NAT 211 se2se amps which were stellar amps and resided in my system for years. My tubed preamp is a Supratek Chardonnay and I am driving Soundlabs Ultimate II  speakers which are a beast to drive. The AGD Audion amps produce little to "No Heat" which allows me to listen much longer. I worry less about tube wear and tube failures  now. I am enjoying my system with longer hours and no maintenance worries. Also they are now easily upgradeable to mkIII status being user serviceable too.  I haven't upgraded to mkIII status yet but will in the future. The AGD Audion amps are definitely "my end game" amps for now and are musically satisfying. Who ever is on the fence you owe it to yourself to seriously audition AGD products.Thanks, Alberto for such a stellar product which definitely exceeds my lofty expectations. 

Hmmm: https://10audio.com/atma-sphere_class-d/

Any idea what happened there?

Wesminister.

Or take a look at these half-width monoblocks heavily biased into Class A.

https://www.modwright.com/products/kwa-99-monoblocks/#:~:text=KWA%2099%20Monoblock%20Amplifiers.%20I%20saw%20demand%20for%20a%20100W

Any idea what happened there?

@antigrunge2 Sure- its the result of a vendetta. Take a look: https://www.audioasylum.com/forums/critics/messages/9/99823.html

With established, respectable reviewers you get something different (scroll down for the reviews).  IMO any serious audiophile should avoid 10Audio if they don't want to waste their time; this has been true the last 25 years.

@atmasphere,

Thanks, clear enough…