Pure Class A amps above 100 Watts?

Clayton Audio
M200 monos - 200/400 wpc into 8/4 ohms
M300 monos - 300/600 wpc into 8/4 ohms
S2000 stereo amp - same as two M300s in one huge case

Indeed, since the low bias setting still provides class A operation up to 200 watts, you should hear little difference between the settings most of the time. For the absolute highest quality reproduction of dynamic material and the most critical listening, the amplifiers should be set to the high bias level for full class A operation.

Nobody but you George has ever questioned that these operate in Class A - as indicated in the mfg’s statement above.  However, your unsolicited challenge doesn’t really matter after all the positive reports/reviews of these amplifiers.  Have you ever heard a pair? BTW, the Lamm M1.2 Reference amps (also Class A) I owned at the same time as my M300s had similar heat sinking to the ML amps in your picture and although the Lamms were quite good, my musical preference was for the Clayton’s, so I sold the Lamms.

300 wpc Class A Clayton - 90 lbs+/-

They actually do say 300wpc in Class A George. The amps also have a bias switch and the manufacturer states they provide 200 wpc in Class A when the switch is in the low bias position.

The Clayton Audio M-300’s are high current differential True BalancedTM amplifiers using class A design in both the driver and output stage. All gain transistors are operated in their linear region for the smoothest, purest sound reproduction.

There are two levels of bias --- high and low --- for maximum user convenience. The low bias setting can be used when operating the unit in standby or for non-critical listening. Indeed, since the low bias setting still provides class A operation up to 200 watts, you should hear little difference between the settings most of the time. For the absolute highest quality reproduction of dynamic material and the most critical listening, the amplifiers should be set to the high bias level for full class A operation.

Rated power output:
300 Watts continuous rms into 8 ohms in Class A
600 Watts continuous rms into 4 ohms in Class A

They run very hot.

I find the 800 watt power consumption and 300 wpc Class A a bit inconsistent unless the design is similar to the Krell so called sliding bias or something along those lines. Otherwise, something more like ~2500+ watts is more realistic which I believe is the point George is trying to make.

I hear you (and George) on that point and cannot really speak to the designer's choices and specs except to say, they are what they are.  I do understand the amp is a dual differential design where the MLs and Krells may not have been, if that makes a difference.  I am not going to disagree with or argue the technical points but will say the amps do sound good, and particularly for the cost.