Rogers Tuner info needed

[pwdrive]

This circuit might do as a basis for the Rogers RF amp, it's a double triode cascode with grounded cathode input, it shows capacitor tuning but I think in the Rogers it's incremental (inductive) tuning, the airwound coil and the small white capacitor connected to the RF amp valve socket in the OP's picture are most likely to be part of the neutralizing network.

Lawrence.