• Country
• United States of America (USA)

• Manufacturer / Brand
• Jackson (The) Electrical Instrument CO., Dayton

• Year
• 1946/1947

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 211792

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

• Number of Tubes
• 3

• Valves / Tubes
• 6J5 6J5 6J5

• Wave bands
• Wave Bands given in the notes.

• Power type and voltage
• Alternating Current supply (AC) / 115 Volt

• Material
• Metal case

• from Radiomuseum.org
• Model: Test Oscillator Model 640 - Jackson The Electrical

• Shape
• Tablemodel with Push Buttons.

• Dimensions (WHD)
• 8.5 x 9 x 6.5 inch / 216 x 229 x 165 mm

• Notes
• Radio Frequency Test Oscillator for radio servicing. Six push-button selected RF output ranges covering 100kHz to 32MHz. CW or 400Hz modulated RF output. Step and variable attenuators to adjust RF output level. 400 Hz external audio output.

• Source of data
• - - Data from my own collection

• Mentioned in
• Radio Retailing (Radio & Television R.) (November 1946 page 152.)

• Author
• Model page created by Milt Margolis. See "Data change" for further contributors.

• Other Models

• Here you find 64 models, 61 with images and 18 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Jackson (The) Electrical Instrument CO., Dayton