It operates in class A (electrons flowing all the time and gives a respectable power output of typically 30mW.
With a sensitive speaker 30mW sounds many times louder than we expect since the ear brain perceives loudness logarithmically.
But the main advantage is the amazing sound quality and big smooth and dynamic sound of just one 2N3053 bipolar transistor from source to a direct coupled speaker.
And the consumption is only 6mA at 12V.
So it can be easily be solar, or photovoltaic powered or even powered by rechargeable batteries that are carefully and protectively sun charged under many a direct sunlight or ambient light condition.
And there is no hiss or any other kind of noise since it is battery powered.
For the schematic, see the reference. If a great quality 800Ω speaker is not available then a 8Ω speaker impedance can be stepped up by an output transformer that can take those milliamperes of collector current without saturating. For extended bass a relative big size should be required. The good news is that many such transformers are available since the are used for similar electron tube single ended output stages.
Reference:
http://euroelectron.blogspot.gr/2018/03/madonnas-voice-coming-from-point-source.html
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