Duo Symphonic Junior 1931

Lafayette Radio & TV Corp; New York (NY)

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  • Year
  • 1930/1931
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 66657
    • alternative name: Wholesale Radio

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

 Technical Specifications

  • Number of Tubes
  • 7
  • Main principle
  • TRF without regeneration; 2 AF stage(s); Screengrid 1926-1935
  • Tuned circuits
  • 3 AM circuit(s)
  • Wave bands
  • Broadcast only (MW).
  • Power type and voltage
  • Alternating Current supply (AC) / 110 volt, also possible for 220 Volt
  • Loudspeaker
  • Electro Magnetic Dynamic LS (moving-coil with field excitation coil)
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: Duo Symphonic Junior 1931 - Lafayette Radio & TV Corp; New
  • Shape
  • Chassis only or for «building in»
  • Dimensions (WHD)
  • 14.5 x 9.5 x 10 inch / 368 x 241 x 254 mm
  • Notes
  • The chassis Duo Symphonic Junior 1931 has two stages of tuned screen grid RF with three tuned circuits, detector and two stages of AF. Tone control. Current consumption 83 watts. Cadmium plated steel chassis and Magnavox Dynamic Speaker less tubes did cost $ 48.50 (list price $ 97.00) and with complete set of RCA Radiotrons and Aerial Equipment for $ 59.95 (list price $ 117.00). For addl. $ 3.50 the models can be run on 220 Volt. See picture details and see details and summaries for the models of this catalog 1931 (season 1930/31).

    Rider's Perpetual volume 1 shows this Lafayette "Duo Symphonic Junior 1931" under "Wholesale" instead of "Lafayette". The Lafayette model "Duo Symphonic Junior 1931" has one dial (primary tuning control knob) with a 3 gang tuning condenser. The two CX345 or 245 power output tubes form a push-pull. See also "Duo Symphonic 1931", "Duo Symphonic (1930)" with 9 tubes and "Great Duo Symphonic" with 8 tubes.
  • Price in first year of sale
  • 60.00 $ !
  • External source of data
  • Ernst Erb
  • Circuit diagram reference
  • Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)

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