|Or perhaps use R/C coupling between the plate of the RF tube and the mixer tube input grid. Say maybe a 4.7k or so plate resistor for the RF tube and a 100K resistor between the mixer tube grid and AVC or ground with perhaps a 250pf coupling cap. Let the RF section of the tuning cap tune the RF tube control grid and loop/Ant transformer.
:Did you forget about a 3 section tuner and an RF coil ?
:If you really want to hod rod an AA5 check this out and have fun.