It would be nice to experiment with other electron tubes too.
Space charge tubes with less power output than 12K5.
Also the possibility of EF183, this time as a power amplifier with a resistor from anode to grid to free electrons as is done on the Pleiades preamplifiers.
A 12SK7 is a good candidate too as with the positive bias grid neutralization it may give a one or two milliamperes even at 12V plate supply through the headphones.
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