Tube amp for a somewhat difficult load

Atma-sphere MA2 MKII.2 should be perfect. Duke can help you out at AudioKineses - He is the man!

the Sonic Frontiers Power 2 110w stereo or Power 3 220w mono amps for a couple reasons.

If you read the review technical/measurement section in Stereophile (where they earned class A recommendation), you will see John Atkinson say it was one of the few tube power amps he could use to evaluate different loudspeakers.

The reason is low output impedence, which equates to a high damping factor, and flat frequency response even with reactive loads.

They are built like tanks, user friendly, dependable, sound amazing, and are at super prices right now so you can get a new one that has a factory warranty and new tubes for the price of a used lesser amp that may be used, no warranty, and wasted tubes.

No matter what...with electrostats, ribbons, or just speakers that are a pain in the ass, they cruise right through.

You may want to look at the Kora Cosmos monoblocks. These are 100 watts of pure class A power. They are rated to and will drive a load from 2-12 ohms all day long. They have a signal to noise ratio of over 100db and a wide bandwidth. They utilize 8 6AS7, 4 EL84 AND 2 6922'S PER MONOBLOCK!
They are also a great bargain at the moment.

Try a Music Reference RM-9, or RM-200.
Roger's amps are taped out to 2, 4 & 8 Ohms, and have plenty of current.
Happy Listening

I am using a modified Music Reference RM9 to drive maggies in a rather large room. I would describe this as being one of the more difficult scenarios for a tube amplifier, but the RM9 is easily up to the challenge. And the best part is it's a steal on the used market.

Oz