Pleiades BD139 one transistor amplifier with output transformer revisited

Signal path:


Ingenue CD album - KD Lang - Sony CD Walkman - Pleiades BD139 - fullrange speaker - female and male listener - reverberant room


Fullrange speaker is either Zeiss Ikon or Pleiades linoleum cube


With output transformer with air gap the sound is big, full, loud and smooth.
 

Since the Zeis Ikon is one the bright side a capacitor was used as frequency selective feedback, see recent posts. The Pleides linoleum cube needed a bit high cut too.