Here is an Romanian battery powered tubed radio from the '50's:
http://www.proradioantic.ro/index.php?x=item&id_p=506
An
here is something intresting: a thermogerator for tube radios: 1,4 V for the filament and 90 V for the plate.
I don't think that in Romania where ever manufactured portable tube radios. But the Soviets made. On the links are 2 radios that can be battery operated and also A.C. operated:
http://www.proradioantic.ro/index.php?x=item&id_p=6234
http://www.proradioantic.ro/index.php?x=item&id_p=6611
http://www.proradioantic.ro/index.php?x=item&id_p=5923
B.t.w., I thought that by 1940 all areas in the U.S.A. where electrified!