Class A Amp

What 2.8 Ohm load speaker specifically?

If the load varies widely by frequency around a 2.8 ohm average spec, then I'm thinking any tube amp, even the Atmasphere, may not be ideal.

I'm thinking one of the other Class A SS recommendations, assuming they double output from 8 into 4 and 2 ohms, or the Rowland or Bel Canto Class Ds that do same would be better.

Most class A amps go to class A/B after 20-60 watts. They simply can't dissipate that much power when idle. I'd go with a moscode bridged mono.

I'm a fan of the Moscode amp, but the dink on it has been a weakness driving low impedance speakers, so I'm not sure it's the best choice for the OP.

Perhaps the new Moscode 402 has improved upon this?

I remember drawing similar conclusions as Tvad regarding driving low impedance loads when researching the Moscode.

Gryphon antileon signature will put around 500 watts of class A power into a 2.8ohm load. Pass xa 200.5 will put 400 class A into 4 ohm or lower loads and the 160.5 320 watts class A into 4 ohm or lower loads. Heavy, hot and expensive all. Only you can decide if it's worth it. My 4 ohm speakers (88db) drop to 2.5 ohms minimum and they will play at ear crushing levels with the Gryphon.