• Country
• United States of America (USA)

• Manufacturer / Brand
• General Radio Company; Cambridge (MA)

• Year
• 1935 ?

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 245431

• • alternative name: GenRad

Click on the schematic thumbnail to request the schematic as a free document.

• Power type and voltage
• Dry Batteries / 4.5 Volt

• Loudspeaker
• - For headphones or amp.

• Material
• Wooden case

• from Radiomuseum.org
• Model: Audio Oscillator 813-A - General Radio Company;

• Shape
• Tablemodel, with any shape - general.

• Dimensions (WHD)
• 9 x 5 x 6 inch / 229 x 127 x 152 mm

• Notes

• 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)

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

• Other Models

• Here you find 238 models, 212 with images and 128 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from General Radio Company; Cambridge (MA)