The links below (also includes the images above) are all the "sub-mini" tube radios sold in the US, made for consumer use that I am aware of. I have seen promotional advertising for others but to my knowledge none have surfaced (such as one advertised by Sylvania). I would be very interested in learning if they are additional brands and models not listed below. Very little documentation is available on these most interesting sets. The few that were made was at the early stages of transistor development which took over the portable radio market in the mid 50's. Some of the later submini tube sets omitted the output tube and replaced it with two transistors and referred to these sets as "Transistorized". Some of the earlier submini sets incorporated one or two miniature tubes as well for some reason such as the Motorola & Silvertone.
Click on the links below for details on these radios.
Automatic Radio "Tom Thumb" & Hybrid
Belmont Radio "Belmont Boulevard"
Crosley JM-8 series "Book Radio" Hybrid
Firestone (same as Automatic "Tom Thumb")
Emerson 747, 838 856
Emerson 838 856
Westinghouse "Peter Pan"