Early Electronic Television
(click on picture for high resolution image)
DuMont introduced this set in 1938, months before RCA first sold sets. This is the early 1939 version of the DuMont 180. It has a 8 x 10 inch picture, and sold for $395. (Information courtesy of Tom Genova). Here are advertising literature, pictures of 180s being made, how the 14AP4 CRT was made, and technical data. Photos of a 1946 television repair shop show a DuMont pre-1945 set on the workbench.
This set is very similar to the Cossor 137T, made two years earlier. DuMont imported several Cossor sets in 1937, and apparently copied many of the features. The CRT is almost identical, with electrostatic deflection. The power supplies are very similar. DuMont did use more modern (octal) tubes (valves) than the Cossor, and the DuMont set has a 4 channel tuner, while the Cossor is a single channel set. It would be interesting to know if DuMont entered into a license agreement with Cossor, or simply "stole" the designs.
Recently, we received a letter from Jerry King, Director of the Dumont Project, which says:
A picture from the screen of the 180