Sparton 931DC Equasonne
Sparks-Withington Co., (Sparton); Jackson, Michigan
- Land
- USA
- Hersteller / Marke
- Sparks-Withington Co., (Sparton); Jackson, Michigan
- Jahr
- 1929/1930
- Kategorie
- Rundfunkempfänger (Radio - oder Tuner nach WW2)
- Radiomuseum.org ID
- 58957
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- Anzahl Röhren
- 8
- Hauptprinzip
- Geradeaus ohne Rückkopplung; 1 NF-Stufe(n)
- Anzahl Kreise
- 4 Kreis(e) AM
- Wellenbereiche
- Mittelwelle, keine anderen.
- Betriebsart / Volt
- Gleichstromnetz-Gerät / 115-125 Volt
- Lautsprecher
- Dynamischer LS, mit Erregerspule (elektrodynamisch)
- Material
- Gerät mit Holzgehäuse
- von Radiomuseum.org
- Modell: Sparton 931DC Equasonne - Sparks-Withington Co., Sparton
- Form
- Standgerät: allgemein.
- Bemerkung
-
The Sparton 931DC Witherington model has one dial (primary tuning control knob) and offers a push-pull audio amplifier. Tubes according to the "Quantity and Types of Tubes" by Sparks-Withington for season 1929/30 would be 6 x 485_Sparton and 2 x 483 as model 301DC, but we show tubes 484 and 182 mentioned in the schematic. It does not make sense: 182 is a rectifier - this is a DC set only and 182 must be a special Sparton tube. See the article here about different radio seasons.
In "Radio Retailing" May 1933, page 47, "Tricks of the Trade" we can read for models Sparton 69-A, 79-A, 930AC, 931AC, 931DC, 301DC and 301AC: "Fourth section of band-pass selector, just preceding RF sometimes cannot be tuned to resonance with first three sections, producing weak reception and loss in selectivity. Give first, second and third selector trimmers 3 turns clockwise. This makes slightly less tuning capacity necessary for given frequency and fourth section selector can not be adjusted for resonance. Balance set in customary manner with oscillator and output meter and re-adjust kilocycle scale on dial by loosening it on shaft and re-setting."
- Datenherkunft extern
- Ernst Erb
- Datenherkunft
- Radio Collector`s Guide 1921-1932
- Schaltungsnachweis
- Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)
- Literaturnachweis
- The Radio Collector's Directory and Price Guide 1921 - 1965 (Rider's 1-22)
- Literatur/Schema (1)
- Radio Manufacturers of the 1920's, Vol. 3 (page 122)
- Literatur/Schema (2)
- Sparton Radio Service Manual (Sparton Manual 1, Bulletin 17-1, 2, Bulletin 6-3, 4)
- Weitere Modelle
-
Hier finden Sie 804 Modelle, davon 363 mit Bildern und 730 mit Schaltbildern.
Alle gelisteten Radios usw. von Sparks-Withington Co., (Sparton); Jackson, Michigan