Re: I want to build a stereo headset valve amplifier
Why not just provide your present amplifier with a resistor load, about 8 ohms, and then continue to run your headphones from it, at least for now.
Whatever valve amplifier you build you will need to provide a load resistor anyway (with very few exceptions) unless it is a very low power one.
Just run your 'phones from an attenuator connected to the output as well as the load resistor.
A lot of commercial amplifiers used a simple resistor (about 330 ohms, one per channel) connected in series with the headphones across the 8 ohm outputs.
Pete
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