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2

2 ; Operadio Corp.; St. (ID = 897629) Radio 2 ; Operadio Corp.; St. (ID = 897630) Radio
2 ; Operadio Corp.; St. (ID = 897631) Radio 2 ; Operadio Corp.; St. (ID = 897632) Radio
2 ; Operadio Corp.; St. (ID = 1278775) Radio  
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2 ; Operadio Corp.; St. (ID = 897629) Radio
Operadio Corp.; St.: 2 [Radio] ID = 897629 700x933
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For model 2, Operadio Corp.; St. Charles (IL):
The first self-contained portable radio, with antenna, batteries and horn
 
Country:  United States of America (USA)
Manufacturer / Brand:  Operadio Corp.; St. Charles (IL)
alternative name
 
Operadio Mfg,
Year: 1923/1924 perfect model Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 6: UV199 UV199 UV199 UV199 UV199 UV199
Tuned circuits 1 AM circuit(s)
Wave bands Broadcast only (MW).
Details
Power type and voltage Dry Batteries
Loudspeaker Horn
Power out
from Radiomuseum.org Model: 2 - Operadio Corp.; St. Charles IL
Material Leather / canvas / plastic - over other material
Shape Portable set > 8 inch (usable also without mains)
Notes

The original tube line up has to be UV199 if this model has arrived in 1923:

The "Saga of the vacuum tube" by Tyne tells us on page 314: "In April 1925 the UV199 was superseded by the UX199, announced August 1, 1925. Production continued up to 1931, although after 1927 few new receivers were built to use it. Nickel-plated contact pins were introduced in 1927."

After some time the UX tubes were noted only by the numbers and a bit later only by the last two digits. The UV199 was introduced in December 1922, the same time as the UV201A.

Price in first year of sale 190.00 $
Collectors' prices  
External source of data Ernst Erb
Source of data Radio Collector`s Guide 1921-1932
Mentioned in The Radio Collector's Directory and Price Guide 1921 - 1965
Literature/Schematics (2) Radio Broadcast, Jul. 1924, p. 274


All listed radios etc. from Operadio Corp.; St. Charles (IL)
Here you find 64 models, 41 with images and 29 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.




  
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