Inconclusive as yet but some elements with examples can be seen in the next post on Pleiades BD139, Pleiades DL33, Pleiades 2N3055 one active device power amplifiers operating in class A (electrons flowing all the time).
It may be that less efficiency means more fidelity.
Nothing gets lost. One looses more energy but it may sound better.
Not much energy. One of these amplifiers consumes 200mA at 9V.
Yet it sends nice quality sound around many rooms.
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