An output transformerless headphone amplifier could be made with EF183.
One EF183 triode connected per channel.
The relatively high anode current, of the order of a few milliamperes at a low anode voltage indicates a low output impedance, since Z=V/I.
The anode current can pass directly through high impedance headphones just like on Pleiades Elektra headphone amplifiers.
Operation can be at 12V supplying both heaters in series and anodes.
A resistor of the order of 1MΩ from anode to grid makes operation possible.
The signal is capacitor coupled to grid.
Cathodes are connected to ground and battery negative.
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