A-44

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

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  • Year
  • 1928
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 58208

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

 Technical Specifications

  • Number of Tubes
  • 10
  • Main principle
  • TRF (Tuned-Radio-Frequency but use of regeneration unknown)
  • Tuned circuits
  • 5 AM circuit(s)
  • Wave bands
  • Broadcast only (MW).
  • Details
  • Record Player (perh.Changer)
  • Power type and voltage
  • Alternating Current supply (AC) / 110 Volt
  • Loudspeaker
  • Electro Magnetic Dynamic LS (moving-coil with field excitation coil)
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: A-44 - Sonora Phonograph Co., Inc.;
  • Shape
  • Console, Lowboy (legs < 50 %).
  • Notes

  • The model A44 from Sonora Phonograph Co. Inc is a combination set in English Renaissance look with grained butt walnut panels and oak bull overlays. The chassis and schematic are from model A-46. It has a push-pull output stage. The tube RA-1 was made by Arcturus for Sonora. Special indirectly heated tube from 1928 with one end of the 15 volt AC heater connected internally to the cathode. The result was an AC tube with a standard 4 pin base which could be used to "electify" battery receivers. Arcturus made also the other tubes in that model for Sonora.

    Sonora made two versions of the A44 models: one that employed the 15-volt Arcturus tubes, and one, which was a converted job, that employed '27 tubes in all RF stages. In the latter case, the volume knob was used to control cathode bias on the RF amplifiers. This method was unsuitable because of the value of the control used; volume control was not gradual.

  • Price in first year of sale
  • 695.00 $
  • External source of data
  • Ernst Erb
  • Literature/Schematics (1)
  • Radio Craft (March 1931, p. 555)

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