[Telecolor 3007]

Beats me, how in U.S.A., a country that was leading electrification (in 1926 probably there where no less the 10,000,000 = ten million electricty users in U.S.A.), radios with power supply taken from the electricity mains camed only so late. I could understeand this if we where talking about Romania, which in 1926 probably had no more then 1% procent of electricity users in U.S.A. (and in 1926 a lot of people in U.S.A. dind't had electricity), but U.S.A. ...
It is true that around 1930 a lot of people in U.S.A. prefferd console radios or it was an exageration about U.S.A. Found the info in an Romanian almanach. I will translate the article if you want.
So only after the pentode camed, radio perfromance started to improve.
I think U.S.A. radio where better designed for reciving more stations.
Radios that used batteries had one advantage: better reciving, because there wheren't mains induced parasites.