[PeterN]

Joseph,

Thank you for the confirmation. I knew that there must be more to the Transformer-less AC/DC radios than the radio design engineers realizing "hey, we saved the cost of the power transformer, and by the way, you could also use it on 110v DC if you had any". I didn't know that anyone had any (I was born in 1956).

I know some of the later farm radios were designed to run on 32v "farm power" (local generators/windmills) that was being used for lighting in the barns, before the "rural electrification" movement started distributing standard power.