Amplifiers operating in class A (electrons flowing all the time) sound much louder than other amplifiers. So their subjective power efficiency is much greater.
The Pleiades 2N3053 is such an amplifier operating with just one transistor at 12V, 6mA.
References:
http://euroelectron.blogspot.gr/2018/03/madonnas-voice-coming-from-point-source.html
Tubes vs Transistors (vs op amps), Is there an audible difference? - Russel O. Hamm - Journal of the Audio Engineering Society
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