B31

Sonora Phonograph Co., Inc.; New York, N.Y.

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  • Year
  • 1929
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 58211

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

 Technical Specifications

  • Number of Tubes
  • 8
  • Main principle
  • TRF (Tuned-Radio-Frequency but use of regeneration unknown); Screengrid 1926-1935
  • Tuned circuits
  • 4 AM circuit(s)
  • Wave bands
  • Broadcast only (MW).
  • Power type and voltage
  • Alternating Current supply (AC) / 110 - 120 Volt
  • Loudspeaker
  • Electro Magnetic Dynamic LS (moving-coil with field excitation coil)
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: B31 - Sonora Phonograph Co., Inc.;
  • Notes

  • The Sonora models B31, B33 and B35 have the same schematic with a transformer coupled push-pull output stage.

    "Talking Machine and Radio Weekly",  Volume 29 number 11 March 12 page 35 shows this tube list: 224 224 224 224 227 245 245 280. 
    The tubes of the two series correspond, so the use of one or the other could only be dictated by momentary availability.

  • External source of data
  • Ernst Erb
  • Circuit diagram reference
  • Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)
  • Mentioned in
  • -- Original prospect or advert (Talking Machine and Radio Weekly Volume 29 number 11 March 12 page 35)

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