[Penthode]

I removed the source resistor bypass 100uF. I then chaned the bias resistors to raise the input resistance and keep Id at 5mA.

The generator was in series with the 27k simulating the 12AU7 plate impedance. The 330 kohm resistor was removed.

The gain is now just a hair under 10 times which should be close enough. The phase error was due to the source bypasss capacitor which is now gone and the remaining is the AC scope coupling: switching to DC coupling on the input reduced the phase error by about 1/2. I cannot remove the output AC coupling because the drain is at 200 VDC. So I believe the phase error has been acounted for and is not in the circuit.

I have insufficient input signal (it was only 15 v p-p) so I cannot check linearity at the higher output voltage. Although removing the 27kohm input resistor pushed the output to 200 VDC and the sine was perfect hence the non linearity appears to be no longer there.