In message , Anthony Fremont
writes
[snip]
What is the secret to beautiful waveforms? Do I need another LC resonator
on the output to fix it up? I mean, I'm getting a pretty nice wave now, but
there is still some distortion that you can just see at the top of the peaks
on the yellow trace.

Symmetry is a nice word to use where LC resonance is concerned.
Symmetry for the drive and clipping mechanisms.

Have a look at a long-tail transistor pair with cross-coupled
collector-base feedback resistors, and collectors driving a
centre-tapped LC resonant circuit.
--
Tony Williams