The Audion Oscillator is a very straight forward circuit which should perform well. The common problem with an audio oscillator is oscillations so they took an audio amp and added feed back to make it oscillate.
It looks like one of the early AF amps with a tank in the output where the head phone would be. R1 is the output tap and C4 is the feedback. The CB amp is non-inverting so the feedback is in phase with the input.
The green is across R1 and the blue is the tank. If this circuit was build with a plug for the coil it could be used in a multi band set.
I adjusted the sweep to get a better look at the signals. Looks like it is time for a build.
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