did anyone build this amplifier or is it just purely theoretical. (ZEN split load single ended amplifier i found in this tubeCAD post)

Much better to skip that SE version and go PP, circlotron. At low impedance the powersupplies capacitances are no issue.(contrary to high impedanxe tube based circlotron). The beauty of it would be the possibility of being able to use truely paired output devices of the same type without needing any inductive devices (alltough, especially regarding speaker protection, a split load transformer mc intosh style could also be a good idea)
 
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that looks intresting. if i only could get rid of the zener diode and replace the top fet with an pnp.