Re: Cathode follower line out - best practice
What I would possibly have done is to fit a 100K resistor between the HT and the triodes anode but decouple the anode with a 10uF capacitor.
That way DC wise it would behave like a normal triode circuit but AC wise, like a common cathode.
Try also looking at the circuits for the Revox A-G36 (I don’t have it to hand) that has common cathode outputs as standard
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