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Not sure I would call that 'classical'

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The original 'classic' Circlotron circuits date from the 1950s and look nothing like this.

There are some missed bets in the voltage amplifier circuits. You might want to run your simulations again after installing effective constant current sources for the differential amplifiers- most semiconductor designs have them, why not tubes? I would also consider running a bipolar supply for the driver circuit. It will help in enhancing the performance.

FWIW, though I find that most CCS circuits used in transistor amps are ineffective. You might want to look in the archives here for a better CCS design.

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