Looking at the 2N3055 datasheet on how promising it can be as a single transistor low voltage single ended power amplifier

 At your risk.

So far one nice combination is Vb=10V, Ic=100mA, using a 64ohm to 8ohm output transformer. Nice sound, a test using the Flashdance soundtrack CD.

How would high power sound with an 8ohm to 8ohm output transformer while increasing Ic? Or for example 24ohm to 8ohm.

Or even higher Ic for example 2A, a Darlington transistor and a step up output transformer, for example 1ohm to 8 ohm. If this works it can be a joy to make such transformers as there are few turns of wire to wind involved.