If you wanted a portable radio 75 years ago, you could have one. It would weigh a mere 14 pounds, and would only set you back a dollar a week. This set was available for $19.95, or one dollar a week. It is shown here in this ad from the Milwaukee Sentinel for July 27, 1939.
I haven’t been able to find any information on the particular portable in the ad, but it looks very similar to the RCA model shown here. The RCA weighed in at 14 pounds, had four tubes, and operated on a 1.4 volt A battery and 90 volt B battery. The B battery was stated to last 250 hours, and sold for $3.50.