This is just one transistor direct driving a 800Ω speaker or an ordinary 8Ω speaker through an output transformer that can take typically 10mA of DC current. The transformer can be smaller or of fewer primary and therefore secondary turns for an electric guitar since the first octaves after 20Hz are not produced by a guitar. A radial heatsink is used just in case to protect from transistor thermal runaway.
On preliminary tests it give a much louder sound than a 12K5 electron tube power amplifier.
And it has interesting overdrive distortion too. The source used is a Sony CD Walkman player with a John Barry James Bond compilation CD. The guitars were brilliantly reproduced as if someone wa playing in the room.
Power output should be typically 30mW. It sounds loud, filling with sound more than a few rooms, hopefully without annoying neighbours.
Consumption is only 7mA at 12V.
Many nearby euroelectron posts are dedicated to this miraculous sounding little amplifier.
It operates in class A meaning electrons are flowing all the time. And they flow all the time even through the speaker. In fact it is very easy to turn off the amplifier by just disconnecting the speaker or having a switch in series with the collector circuit.
The schematic is open source as everything else Pleiades and can be found at the referenced post.
Reference:
http://euroelectron.blogspot.gr/2018/03/madonnas-voice-coming-from-point-source.html
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