Listening to the Pleiades Siemens AC151 one transistor open base front end microphone amplifier at overload level

Signal path: Shure VP64 with male singing voice or Alan parsons Sound Check 2 CD played on Sony Walkman cD Player with its line out attenuated by a 600ohm to 600ohm variable dB laboratory Solartron attenuator - Pleiades Siemens AC151 with Cb 56n when mic is used or 220nF when cD is used for -3bD at 100Hz and flat beyond 20KHz with no negative feedback, base open, Vb=9V, RL=56K, Cout+820nF - Realistic disco mixer at mic in or line in when mic was used or line in when CD was used - Sennheiser HD580 fed by disco mixer or directly by AC151 through a Canford red output transformer inside a Neutrik 1/4in jack. The AC151 prepreamplifier passes the low noise test by canselling effectively the ambient noise when mic is connected out of phase (caution to ear protection needed, see previous post). Mic sounds very clear, the WE 1:2 input transformer was also used with excellent results. The unprocessed sounds on the Alan Parsons CD, near or after overload: Sinewave nice gradual overtones at gradual overload. Voices very nice, soprano reverb out of control intermodulating. Piano nice. Acoustic guitars excellent like Torn - Natalie Imbruglia. Electric, bass guitars very nice distortion. Flute great distortion. Saxophone amazing distortion at any overload level, shows how these amps bring out the edge inside music. Percusion great like those amazing Enoch Light LPs. Cymbals sound bad at overload.Hi hat sounds amazing at overload, again detail inside music brought out. The first orchestral track sounds bad but the later one sounds very good at overload. The techno track sounds amazing. Pipe organ nice too. It seems definetly worth building this preamp inside a plastic box with 9V battery cover. Just a transistor, 2 coupling capacitors and a 56K load resistor. Current consumption at microamp level. Battery may last for ages. Solar powered too?