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TK's 6SN7 non-inverting cathode follower preamp: Z out ?

Posted by deathtube 667 on June 6, 2017 at 11:11:06:

I was playing around with this non-inverting cathode follower preamp in LTSpice.

At lower Hz's, the Z out seems to have a bit of a slope going up to 3.6K ohms @ 20Hz.

Raising up the output cap value from 2.2u to 47uf seems to flatten out the Z curve at lower frequencies a lot, but doesn't seem to influence gain or THD%.

Would it be OK to flatten out the Z curve with a bigger uF output cap or should I just keep to the schematic values?

dt 667