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Amplifier 250

Amplifier 250; General Radio (ID = 757626) Ampl/Mixer
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Amplifier 250; General Radio (ID = 757626) Ampl/Mixer
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Country:  United States of America (USA)
Manufacturer / Brand:  General Radio Company; Cambridge (MA)
alternative name
Year: 1930 ?? Category: Audio Amplifier or -mixer
Valves / Tubes 3: 27 50 unknown_Tube
Main principle Audio-Amplification
Wave bands - without
Power type and voltage Alternating Current supply (AC) / 110 Volt
Loudspeaker Magnetic loudspeaker (reed) generic.
Power out
from Model: Amplifier 250 - General Radio Company;
Notes Amplifier and "B" eliminator.
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 210 models, 193 with images and 80 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.