Sparton 39 Equasonne

Sparks-Withington Co., (Sparton); Jackson, Michigan

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  • Jahr
  • 1928/1929
perfect model
  • Kategorie
  • Rundfunkempfänger (Radio - oder Tuner nach WW2)
  • Radiomuseum.org ID
  • 58604

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 Technische Daten

  • Anzahl Röhren
  • 9
  • Hauptprinzip
  • Geradeaus ohne Rückkopplung; 3 NF-Stufe(n)
  • Anzahl Kreise
  • 4 Kreis(e) AM
  • Wellenbereiche
  • Mittelwelle, keine anderen.
  • Betriebsart / Volt
  • Akku und/oder Batterie
  • Lautsprecher
  • - Für Kopfhörer oder NF-Verstärker
  • Material
  • Gerät mit Holzgehäuse
  • von Radiomuseum.org
  • Modell: Sparton 39 Equasonne - Sparks-Withington Co., Sparton
  • Form
  • Tischgerät, Truhenform, meist mit Deckel (NICHT Schrägpult).
  • Abmessungen (BHT)
  • 610 x 267 x 318 mm / 24 x 10.5 x 12.5 inch
  • Bemerkung

  • The Sparton model 39 has one dial (primary tuning control knob). The models 39, 69, 79-A, 89, 89-A, 99, 109 and 930 are the first "Equasonne" models. The tubes are the original line up, not replacement, according to the page "The quantity and types of tubes used in Sparton receiving sets" and of Rider's page Sparton 5-6, displacement would be the tube 486. The model 39 and (later) model 49 share the same tubes (and schematic).
    See also the article here about different radio seasons.

    The history to the Equasonne line: In February 1928 RCA sued Sparks-Withington for using the Alexanderson TRF patent. After that, Sparton began using a circuit not covered by that patent, a circuit invented by Lester Jones (Technidyne Corp.). A tube with tightly controlled grid-to-plate capacitances was needed and Sparton-Cardon created the type 484, 485 and 486 and produced them too. Before, Sparton used Kellogg tubes. The Equasonne is a two chassis construction. The RF chassis with 6 tubes used (also?) a phenolic board, not metal. The trick is a 4-circuit pre-selector followed by a broadband amplifier system. Then follows the audio unit with a power-detector (plate detector) with a very high value cathode resistor for a non-linear detector which amplifies.
    The next season followed the Equasonne models 49, 101, 110, 111, 111-A, 301, 301-DC, 931 and 931-DC. The last Equasonne appeared in 1930/31 as models 103, 235, 564, 570, 574, 589, 591, 593, 600, 600-DC, 610, 610-DC, 620, 620-DC, 737, 740, 740-DC, 750, 750-DC, 870.
     

  • Datenherkunft extern
  • Ernst Erb
  • Schaltungsnachweis
  • Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)

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