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Modulating Oscillator 403-C

Modulating Oscillator 403-C; General Radio (ID = 757629) Equipment
Modulating Oscillator 403-C; General Radio (ID = 1324483) Equipment
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Modulating Oscillator 403-C; General Radio (ID = 1324483) Equipment
General Radio: Modulating Oscillator 403-C [Equipment] ID = 1324483 930x535
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For model Modulating Oscillator 403-C, General Radio Company; Cambridge (MA):
The General Radio Experimenter March 1930
Country:  United States of America (USA)
Manufacturer / Brand:  General Radio Company; Cambridge (MA)
alternative name
Year: 1930 ?? Category: Service- or Lab Equipment
Valves / Tubes 2: unknown_Tube unknown_Tube
Power type and voltage Storage and/or dry batteries
Loudspeaker - - No sound reproduction output.
Power out
from Model: Modulating Oscillator 403-C - General Radio Company;
Notes Internal or external modulation signal; modulating voltage meter.
External source of data Ernst Erb
Circuit diagram reference Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)

All listed radios etc. from General Radio Company; Cambridge (MA)
Here you find 211 models, 194 with images and 81 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.