Kevin:
I think you might be right on the money for the one "volume control" because it is a coil that moves with the knob and depending on how the coil is positioned it makes the selectivity of the radio better or worse (better or worse separation between stations on the dial and also makes the overall reception better or worse depending on the position of the coil) and the second "volume control" which is the one that is actually a rheostat type control is the actual volume control because the overall volume of the set is made louder or quieter when that knob is turned.
Titan1a: This radio I think is on par with Grebe as far as being a great DX'ng TRF set because as I said previously this radio was picking up stations loud and clear from as far away 300+ miles away or more, and this radio is still using the original bypass caps for the RF cans!
Also I got my replacement speaker in for this radio's speaker cabinet which was an American Bosch Model 612 8" Dynamic Speaker just like what was in there originally so right now I'm working on repairing the blown out wood around the original screw holes that were used to hold the original speaker in place when the speaker was made back in 1927, and I'm making the repairs with Elmer's Stainable/Paintable and Sandable Wood Filler that also resists shrinking and cracking.
Once I'm done repairing the damage I'll re-drill the holes back where they were originally and install the speaker and put it back together and wire up the speaker and test out the radio with the newly repaired speaker and see how it sounds and works.
