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Audio Oscillator 813-A

Audio Oscillator 813-A; General Radio (ID = 1574093) Equipment Audio Oscillator 813-A; General Radio (ID = 1577686) Equipment
Audio Oscillator 813-A; General Radio (ID = 1577687) Equipment Audio Oscillator 813-A; General Radio (ID = 1577688) Equipment
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Audio Oscillator 813-A; General Radio (ID = 1574093) Equipment
General Radio: Audio Oscillator 813-A [Equipment] ID = 1574093 600x399
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For model Audio Oscillator 813-A, General Radio Company; Cambridge (MA)
Country:  United States of America (USA)
Manufacturer / Brand:  General Radio Company; Cambridge (MA)
alternative name
Year: 1935 ? Category: Service- or Lab Equipment
Power type and voltage Dry Batteries / 4.5 Volt
Loudspeaker - For headphones or amp.
Power out
from Model: Audio Oscillator 813-A - General Radio Company;
Material Wooden case
Shape Tablemodel, with any shape - general.
Dimensions (WHD) 9 x 5 x 6 inch / 229 x 127 x 152 mm

The GR Audio Oscillator 813-A consists of a microphone driven tuning fork and an output filter which attenuates the second harmonic by more than 40 decibels.
Output impedance: 50, 500 and 5000 ohms.

The Type 813 Audio Oscillator is available in two models, 400 cycles and 1000 cycles.
Other frequencies between 300 cycles and 1500 cycles can be obtained on special order.

Price for the 400 cycles model: $36.00

Price in first year of sale 34.00 US$
Mentioned in - - Manufacturers Literature (General Radio Experimenter Volume XI No. 12 May 1935)

Model page created by David Carroll. See "Data change" for further contributors.

All listed radios etc. from General Radio Company; Cambridge (MA)
Here you find 216 models, 197 with images and 84 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.