Why EUREKA, nothing new discovered, Pleiades 2N3053

At your risk. It sounds fantastic. Even with a small output transformer althought at preliminary comparison the bigger Sowter SK05s may be better. Small size, small weight, in class A (electrons flowing all the time and dancing to music. It works well with different kind of loudspeakers. Althought less than one Watt it can fill a large room with comfortable great sounding music. No class B crossover distortion. No complicated phase spitter for push pull. No driver transistor needed, since the power transistor operates at low current, and output transformer steps this current up. Impedance matching for maximum power transfer done by output transformer. No complicated PSU, regulators etc, internaly chacing up the music signal needed. As simple as it may get, just one transistor, one bias resistor, one output transformer, one coupling capacitor, 2 12v batteries etc in series with a fuse. Pure class A with low power consumption. Small size, small power output, big sound with a bigish loudspeaker, (big cabinet compared with drive unit having a low reasonance frequency, deep bass, amazing mid, treble. Depth of sound, musicality and smooth detail, smothness. No negative feedback chassing up the music signal needed, no slew rate problem, no crest factor problem... Gradualy increasing low order harmonic (non linear) distortion as output signal increases, ie at high level. Distortion tends to 0 as signal tends to 0 (for example when signal passes throught to x axis, just like real musical instruments. Just like nature.

Eurika, even a small (air gaped?) transformer can be used on the Pleiades 2N3053 single transistor power amplifier

At your risk, including all other posts, my appologies if any of all these public domain posts are or are interpreted as being offending. A small Grundig BV 9054-339.02 output transformer has been used at such low power consumption or power output much less than 1 Watt and the sound is still big with deep bass, great mid , great delicate, extended treble as expected from a class A (electrons flowing all the time) amplifier. Signal path: CD single Crush - Jennifer Page - Sony CD Walkman line out - Pleiades 2N3053 single transistor power amplifier with small Grundig output transformer, Vb=24V - Fostex FE127E speaker in Pioneer CS-353 cabinet facing ceiling in large living room - listener at about 2 meters in any direction.

2 omni microphones for Left, Right and an out of phase omni mic for noise, bad acoustics canceling

It works. Signal path: Beyer M55 to L input, Beyer M55 to R input, out of phase Beyer M55 to (L+R ie Mono input) - UHER Mix 700 Stereo Mixer ie Adder - Sennheiser HD-580. Alernatively hybrid transformer(s) can be used connected directly to the microphones. The great trick found in (Microphones - Lou Burroughs) book can even be used for a binaural or stereo recording.