[Winky Dink]

So...I start experimenting with the signal tracer, and after a while I can tune in the signal from the signal generator at C52/R50 which is the grid of one of the 41's. Before I moved to another signal point, I hooked up the loop antenna and found that I could tune in the strongest local station, audible through the signal tracer only (I turned the tracer speaker off to be sure there was no audio through the radio speaker)...and the audio was moderated with the radio volume control. Then, for reasons unknown, the sound of the audio seemed different. I turned off the signal tracer, and realized the audio is through the radio speaker. Go figure.

Now I can tune in the local stations very weakly, each over a broad range-- and I'll move on to alignment.
Thanks again Mike. You are credited with an assist.