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OTL, Output Transformerless Amplifier User Group.

In truth, Tre',...

how many manufacturers state in print that their amplifiers are "Class A", when their products do not in fact operate in Class A up to full power output? The answer, I think, is nearly ALL of them. One company makes a big deal out of the fact that their hideously overpriced linestage operates in "Class A" and uses "no feedback". I hope you are an equal opportunity gadfly.

I have never read the Atma-sphere website in detail. I did not even know that there is a claim to full Class A operation. (Does it really say that? Or does it say "Class A", without specifics?) I really don't give a flying big one what you call the mode of operation, and I have long been aware of the phenomenon that limits Class A power, which you pointed out here for the second or third time in the last several years. Still, Atma-sphere amplifiers are the best sounding tube OTLs I have heard during my 40 years in this hobby.

The world we live in is full of much more consequential false claims that need to be debunked.


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