So I came into this headphone amp design while fooling around fleaBay.

I have a small stash of 6C45S that might be handy for this. I wonder what do you folks think about the schematics? Any suggestion for improvements?

How would I calculate the output impedance and power output?

I have the notoriously inefficient HE-6 (50-ohm, 84db) headphones, would be curious if this could power the HE-6...

Best!

I have a small stash of 6C45S that might be handy for this. I wonder what do you folks think about the schematics? Any suggestion for improvements?

How would I calculate the output impedance and power output?

I have the notoriously inefficient HE-6 (50-ohm, 84db) headphones, would be curious if this could power the HE-6...

Best!