lol,
we moved into the dark ages when somebody realised that you could prop up a solid state amplifier with feedback to linearise a none linear and cheaper to make transistor amplifier and use horrible pushpull with more impressive power figures for wattwachers with defective hearing,
they eased us into it with pushpull pentodes and ultra linear taps thinking nobody would notice their scullduggery,
that opened the door for cheap loudspeakers with smaller cheaper magnets for the masses,
with the exception of a handfull of modern high end tube designs we have gone backwards ever since the pure class A directly heated triode used in the single ended zero feedback amplifiers of the 1930's'
beam tetrodes, pentodes, ultra linear taps, pushpull, feedback, feed forward, solid state, class b, class ab1-linear, all pull the wool over your ears,
reminds me of the modern cber with his very inefficient class c keydown amp running on stock volts:sad:.