Class A amplifier choice, need suggestions

to be more precise SA series work in class A at whole rated power in to 8 ohms. that i learned from the manufacturer. i 90% tend to believe due to their huge massiveness of the chasis and real worm sound.

Correction: The Pass 600 idles at 600 watts giving it 150 watts of Class A. I used them on 4 ohm Apogee speakers without budging past the idle current flow even at high decibles. I'm using it on the 1 ohm Apogee Scintilla now, and at moderately loud volume, it still doesn't move beyond class A. When I crank it way up, yes it does move to B on heavy transients, and I don't detect a difference, the amp runs so clean.

Pass' Peter Perkins informed me last spring that he underwstands that the X600 operates in class A up to 100 watts continuous and 200 watts peak. This seems to corroborate the 150 watt (effective average?) Muralman1 cites. An interesting side note was that he described the X1000 as generating 90 watts continuous and 180 watts peak in class A. Obviously, the X1000 goes higher than the X600 in class AB. I conjecture that the X1000 may generate more heat per class A watt and that the heat dissipation capabilities of the chassis and heat sinks (same for both amps) are a limiting factor in setting the class A bias.

For value...Musical FIdelity or creek...

AtmaSphere tube amps, without a doubt work well with my 3.5,s though I'd love to hear from anyone that has compared the proac 3.5,s with the newer 3.8,s
Mike