J-728

General Electric Co. (GE); Bridgeport CT, Syracuse NY

Data
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Pictures
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  • Year
  • 1940/1941
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 42375
    • Brand: Musaphonic

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

 Technical Specifications

  • Number of Tubes
  • 6
  • Main principle
  • Superheterodyne (common); ZF/IF 455 kHz
  • Wave bands
  • Broadcast plus 2 Short Wave bands.
  • Details
  • Changer (Record changer)
  • Power type and voltage
  • Alternating Current supply (AC) / 115-125 Volt
  • Loudspeaker
  • Permanent or electro-dynamic (moving coil), system not known yet. / Ø 14 inch = 35.6 cm
  • Power out
  • 4 W (unknown quality)
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: J-728 - General Electric Co. GE;
  • Shape
  • Console with any shape - in general
  • Dimensions (WHD)
  • 35.2 x 35.2 x 16 inch / 894 x 894 x 406 mm
  • Notes

  • The GE model J-728 is a Radio-Phonograph Combination console. Models J-718 and J-728 share the same radio chassis but a different cabinet. It might be it is only the color and therefore we keep the picture for J-718 here - until we know more. Reception is broadcast 540 to 1600 kHz and short waves 2.3 to 22 MHz in two bands: 2.3 to 6.9 and 6.9 to 22 MHz. Output is 4 watts undistorted (5.5 max.). There are 3 different transformers possible, all for 110 to 125 volts, but watts depending on cycles: A-6 for 60 cycles, 95 watts, A-5 for 50 cycles, 95 watts and C-2 for 25 cycles, resulting in 105 watts. This model is in Blond Mahogany Veneers.

  • External source of data
  • Ernst Erb
  • Circuit diagram reference
  • Rider's Perpetual, Volume 12 = ca. 1941 and before
  • Literature/Schematics (1)
  • General Electric Radio Service Notes 1939-1942
  • Literature/Schematics (3)
  • General Electric Folder 13-497-W for 1941.

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