"Richard Fry" wrote in message
...
In the beginning every radio, or virtually every radio, was
battery operated. They all used B batteries. It was only
later that radio ran off AC line voltage.
______________

In the VERY beginning, radio susednobatteriesatall.Thoseradioswere
all solid-state, using a tuned coil of wire connected to a detector formed
by a piece of galena and a "catwhisker," driving a headphone.

RF



In the very beginning, radio used coherers, which could be described as
"granular state". That is, if you don't count the spark gaps Hertz used in
his experiments.

Frank Dresser