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Powering something from the cathode bias of a tube is not a bad
idea in itself, but the circuit you are referring to uses base bias,
and is a textbook example of how NOT to bias a bipolar transistor
properly. Furthermore, as drawn the amplifier won't work because
the collector resistor is way too big: if the supply voltage is say 11 volts,
you can at most get .05 ma collector current which is maybe 50 times too
small. Reducing the collector resistor, and adding a proper emitter resistor
to control the gain should help getting it to work. Good luck!
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