• Anno
  • 1929/1930
perfect model
  • Categoria
  • Radio (o sintonizzatore del dopoguerra WW2)
  • Radiomuseum.org ID
  • 58954

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 Specifiche tecniche

  • Numero di tubi
  • 9
  • Principio generale
  • A circuiti accordati (amplif. diretta) senza reazione
  • N. di circuiti accordati
  • 4 Circuiti Mod. Amp. (AM)
  • Gamme d'onda
  • Solo onde medie (OM).
  • Tensioni di funzionamento
  • Alimentazione a corrente alternata (CA) / 100-130 Volt
  • Altoparlante
  • AP elettrodinamico (bobina mobile e bobina di eccitazione/di campo)
  • Materiali
  • Mobile in legno
  • Radiomuseum.org
  • Modello: Sparton 931AC Equasonne - Sparks-Withington Co., Sparton
  • Forma
  • Console di qualsiasi tipo
  • Annotazioni
  • The Sparton 931 (AC) 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 the tubes of model 591: 6 x 485 Sparton, 2 x 482B and 80. We have shown before the tube: 484 484 484 484 484 484 182 182 280 which would make only sense if it is special Sparton tubes. 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."

  • Prezzo nel primo anno
  • 179.00 $
  • Fonte esterna dei dati
  • Ernst Erb
  • Riferimenti schemi
  • Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)

 Collezioni | Musei | Letteratura

Collezioni

Il modello Sparton 931AC Equasonne fa parte delle collezioni dei seguenti membri.

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