Sparton 930AC Equasonne

• Paese
• USA (Stati Uniti d'America)

• Produttore / Marca
• Sparks-Withington Co., (Sparton); Jackson, Michigan

• Anno
• 1928–1930

• Categoria
• Radio (o sintonizzatore del dopoguerra WW2)

• Radiomuseum.org ID
• 58953

• Immagini
• Schemi

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• Numero di tubi
• 9

• Valvole
• C-485 C-485 C-485 C-485 C-485 C-485 182B or C-182 182B or C-182 280

• Principio generale
• Amplificatore per radiofrequenza

• N. di circuiti accordati
• 4 Circuiti Mod. Amp. (AM)

• Gamme d'onda
• Solo onde medie (OM).

• Tensioni di funzionamento
• Alimentazione a corrente alternata (CA) / 3 taps, 100 to 110, 110 to 120 and 120 to 130 Volt

• Altoparlante
• AP elettrodinamico (bobina mobile e bobina di eccitazione/di campo)

• Materiali
• Mobile in legno

• Radiomuseum.org
• Modello: Sparton 930AC Equasonne - Sparks-Withington Co., Sparton

• Forma
• Console di qualsiasi tipo

• Annotazioni

• The Sparton 930 (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 1928/29 would be the tubes of model 591: 6 x 485 Sparton, 2 x 482B and 80 but this is replacements!
  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, replacement for the C-485, C-484 or 484 would be the 485_Sparton. The 482-B would be the replacement for the 182-B or C-182.
  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
• 169.00 $

• Fonte esterna dei dati
• Ernst Erb

• Fonte dei dati
• Radio Collector`s Guide 1921-1932

• Riferimenti schemi
• Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)

• Bibliografia
• The Radio Collector's Directory and Price Guide 1921 - 1965

• Letteratura / Schemi (1)
• Sparton Radio Service Manual (Sparton Manual 1, Bulletin 11-1, 2, Bulletin 6-3, 4)

• Altri modelli

• In questo link sono elencati 807 modelli, di cui 365 con immagini e 754 con schemi.
  Elenco delle radio e altri apparecchi della Sparks-Withington Co., (Sparton); Jackson, Michigan