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output impedance

Gain is not necessarily a "problem", but the output impedance of this circuit could be. It would be roughly equal to the parallel sum of the plate resistance of the Type 27 (~9K ohms) and the 22K plate resistor. The 470K resistor is also in parallel but won't have that much effect because of its much larger value. So, you're looking at something around 7K output Z. Ideally, you'd like around a 10X higher input Z for the amplifier you would be driving, something >70K. But here I also wonder about the 0.1uF coupling capacitor, seems too low for good low frequency extension, if indeed the input Z of the amplifier is on the order of 100K or any lower.

I haven't thought about these issues for a long time. I'm sure I will be corrected if this is not entirely accurate info.

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