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I have been looking at that as well. I have not pulled the chassis out yet, but there are 3 controls on the front. I know one is tuning, one has to be volume, but what is the other one. I see R4 on the schematic, looks like it would change the sensitivity or the final RF amp stage. I could see that controlling volume. HA1 and HA2 on the schematic look like maybe they are used for hum balance. One for the 26 filaments, and one for the 27 filament and pilot lamp. Maybe those are ganged and are the third knob on the front. That would seem odd, but I don't see any other controls on the schematic. Other than the switches of course, one for power and one for sensitivity of the antenna coil. I am not familiar with the speaker either. This looks like a large magnet with an armature that connects to the cone instead of a voice coil. I will get some pictures up as soon as I get it unloaded from the van and in the house.
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