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RE: Circlotron with MOSFET output

Yes 6c45p tube is OK for that position ( I strictly refer for use in Mr.Ciuffoly original hybrid Circlotron design ).
Few remarks :
6c45p tube have enormous high coefficient of gain ( 52, + - 16 ) ,and originally is used for Russian military Radar RF equipment so is very prone to oscillation in RF VHF/UHF spectrum if is not used properly in Audio application , special when is connected as Anode Follower SET driver like is done in the original Mr.Ciufolly design .
So the grid stop resistor connected near as possible to tube socket is mandatory , and some small value 100Pf/1KV capacitor connected in parallel with driver transf. primary coil is good to for prevention of oscillation in RF range .

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