The one transistor amplifier on Sony TC-158SD

https://www.petervis.com/Cassette_Tape_Recorders/sony-tc-158sd/tc-158sd.html


It is at the headphone output:


https://www.petervis.com/Cassette_Tape_Recorders/sony-tc-158sd/tc-158sd.html


A single ended one transistor amplifier operating in class A (electrons flowing all the time).


With output transformer.