[Phlogiston]

Really neat one there Russ. Sounded good for such an oldie. Interesting how the air coupling of the coils worked. Thanks for showing that part also.

You can see why they later just put the windings of the transformers on one form close together. But in this radio that is the most effective means of volume control - better than using the filament voltage. It would be like variable antenna coupling in later radios. Instead they became fixed with a variable resistor on one winding or the other - not better, just easier.