Where Have All the 2A3 Amps Gone


2A3 amps seem to have fallen out of favor with designers. Does anyone know why?
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It is a pity. I was hoping, that we will get more high efficient speakers in our modern time (with our technology it shouldn't be problem), but there is no change. Always the same 86dB-92dB Speaker Stuff.
Some years ago I listened to such an amp with a good 100dB System and it was very good. Some say, the truth is in the first watt...
But unfortunately it is a real task today to walk that road...