[TTech]

Thanks again for the info Chas. I do have a copy of the Atwater Kent Radio instruction book, volume 2. This radio came with no cables. Thinking of selling off a few motorcycles Eliot. So with my retirement goal of becoming lazy, the ARBE III is pulling at my wallet fairly strong.

With compass in hand along with 9 volt battery, multimeter, and spring scale. Determined what was North and South, Positive and negative. 
Since I don't yet have a working radio tried just sending a 1k tone audio from my sig gen to see if speaker would respond in any way. I know I'm not the first one, but a new adventure for me. O-scope  said my 1000 hz was 20 vpp .5volt DC. Expected a very weak response from the speaker especially with my mason jar and metal band modification. Was surprised when I was rewarded with a loud very clear 1000 hz  tone I could hear in all rooms of the house. My mason jar glass threads allowed me to once again tune the speaker for loudness and clarity. With a little tuning it could also reproduce a clear 400 hz tone. At 1000 hz could still hear a tone even when I reduced the tone amplitude to .9 vpp. At this point was glad I could produce such a clear tone off the original  driver and metal diaphragm. Don't know how it will respond when connected to the real thing. But this also keeps me hopeful.