[MrFixr55]

Any AA6 or similar set that I had or now have, has a 3 section tuning cap, one section for the RF, one section for the mixer and one section for the local oscillator. Granted, my Radiola 16, 7 and 18 sets have an untuned RF stage, but these are TRF sets (Except that first RF stage is not "T"). Examples include my friends Philco 89 from #&!!, My 46-350, my Zenith 8G005 TO, 6G001 portable and 4 AM/FM sets. My 6S52 does not have an RF Amp but does have a 3 section cap because it has a rather fancy 2 stage antenna coil.

I think that the scheme that CoRadio and Fada used were to save money, possibly at a loss of some selectivity but the gain of having an RF Amp for more sensitivity and the important protection against "broadcasting" of the local oscillator, especially if the CoRadio "hotel" radios were connected to common antennas.