Hello good people of diyaudio!

I'm still in the process of learning LTspice and I have been trying the H2 Generator circuit by Mr. Pass.

I did manage to simulate the circuit and from a quick calculation of the 2nd harmonic I arrived at around 1% distortion which seems correct for this circuit.

I then used the THD calculation directive .four to confirm my math however the result in the error log is like 50% (80%)

could someone clarify for me why the THD level is so high compared to my manual calculation?

Thank you for your time!!

I'm still in the process of learning LTspice and I have been trying the H2 Generator circuit by Mr. Pass.

I did manage to simulate the circuit and from a quick calculation of the 2nd harmonic I arrived at around 1% distortion which seems correct for this circuit.

I then used the THD calculation directive .four to confirm my math however the result in the error log is like 50% (80%)

could someone clarify for me why the THD level is so high compared to my manual calculation?

Thank you for your time!!