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4-A

4-A ; Western Electric (ID = 1278624) Radio 4-A ; Western Electric (ID = 1278625) Radio
4-A ; Western Electric (ID = 1278627) Radio 4-A ; Western Electric (ID = 1278629) Radio
4-A ; Western Electric (ID = 1278630) Radio 4-A ; Western Electric (ID = 1278632) Radio
4-A ; Western Electric (ID = 1278634) Radio 4-A ; Western Electric (ID = 1278636) Radio
4-A ; Western Electric (ID = 1278638) Radio 4-A ; Western Electric (ID = 1278640) Radio
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4-A ; Western Electric (ID = 1278624) Radio
Western Electric: 4-A [Radio] ID = 1278624 933x364
Select picture or schematic to display from thumbnails on the right and click for download.
For model 4-A, Western Electric Company Inc.; New York (NY):
Ebay Item number: 251114776531
 
Country:  United States of America (USA)
Manufacturer / Brand:  Western Electric Company Inc.; New York (NY)
Year: 1922 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 7: 215A 215A 215A 215A 215A 215A 215A
Main principle Superheterodyne (common); 2 AF stage(s)
Wave bands Broadcast only (MW).
Details
Power type and voltage Dry Batteries
Loudspeaker - This model requires external speaker(s).
Power out
from Radiomuseum.org Model: 4-A - Western Electric Company Inc.;
Material Wooden case
Shape Tablemodel, Box - most often with Lid (NOT slant panel).
Dimensions (WHD) 26.75 x 8.75 x 6.75 inch / 679 x 222 x 171 mm
Notes Western Electric 4-A Superheterodyne Receiver designed by Harald Friis. During his career with the Bell System, Harald Friis contributed substantially to almost every aspect of the radio art. His earliest work was on vacuum tube efficiency. He then worked on ship-to-shore radio reception. In the early twenties he built the very first field measuring set, for the 300 to 400 meter range. He also designed the first commercial double-detection or superheterodyne radio receiver, the Western Electric 4A receiver. Double detection means that there are two "Detector" stages: the first one is the mixer (of signal and oscillator frequency), the second one is for demodulation.
Mentioned in Radio Manufacturers of the 1920's, Vol. 3 (Page 232)

Model page created by Alan Larsen. See "Data change" for further contributors.



All listed radios etc. from Western Electric Company Inc.; New York (NY)
Here you find 146 models, 121 with images and 27 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.



  
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