My friend Vyacheslav sent me for testing an 6P36S / 6П36С output beam tetrode which was used for TV horizontal deflection circuits in the old days. Here are the nice curves in triode mode:
Low anode resistance and high current capability with its 12W of anode dissipation make this cheap indirectly heated tetrode an interesting candidate for an amplifier. Let’s have a look at the triode model:
Happy to complete the triode SPICE model if someone can translate the Russian datasheet and provide me with the electrode capacitances.
Well, how will this triode perform in a simple SE configuration? With a low Ra, a 5K anode impedance OT will work well: