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77 Ch= 231 M

77 Ch= 231; Electrical Research (ID = 637866) Radio
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77 Ch= 231; Electrical Research (ID = 637866) Radio
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Country:  United States of America (USA)
Manufacturer / Brand:  Electrical Research Laboratories Inc. (Erla); Chicago, Illinois
Year: 1930 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 7: 32 32 32 30 30 71A 71A
Main principle TRF (Tuned-Radio-Frequency but use of regeneration unknown); Screengrid 1926-1935
Tuned circuits 4 AM circuit(s)
Wave bands Broadcast only (MW).
Details
Power type and voltage Line / Batteries (any type) / 32 & 135 Volt
Loudspeaker Electro Magnetic Dynamic LS (moving-coil with field excitation coil)
Power out
from Radiomuseum.org Model: 77 Ch= 231 [M] - Electrical Research
Notes Farm radio, requires 32 V and an additional 135 V dry battery (or eliminator).
One dial (primary tuning control knob); 4-gang condenser; push-pull af output stage.
Price in first year of sale 69.00 $
Source of data Radio Collector`s Guide 1921-1932
Circuit diagram reference Rider's Perpetual, Volume 2 = 1932 (Models 1931/1932)

Model page created by Hans-Joachim Korn † 16.11.15. See "Data change" for further contributors.



All listed radios etc. from Electrical Research Laboratories Inc. (Erla); Chicago, Illinois
Here you find 131 models, 45 with images and 61 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.



  
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