• Paese
• USA (Stati Uniti d'America)

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

• Anno
• 1931

• Categoria
• Radio (o sintonizzatore del dopoguerra WW2)

• Radiomuseum.org ID
• 58629

Clicca sulla miniatura dello schema per richiederlo come documento gratuito.

• Numero di tubi
• 10

• Valvole
• 35 35 27 35 35 27 45 45 80 27

• Principio generale
• Supereterodina con stadio RF; ZF/IF 172.5 kHz; 1 Stadi BF

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

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

• Particolarità
• Giradischi o cambiadischi; Radio with other functions

• 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 45 Visionola - Sparks-Withington Co., Sparton

• Forma
• Console, con gambe d'appoggio alte (> 50%).

• Dimensioni (LxAxP)
• 32.75 x 51.5 x 24.75 inch / 832 x 1308 x 629 mm

• Annotazioni

• Early "Home Talking Movies" set (Movie, Radio Phonograph Combination) Visionola, introduced by Visionola Mfg. Corp., 60 East 42nd Street, New York, sold by Sparton (Sparks-Withington Co.). In February 1931 the model was featured by "Radio News". This was similar to Visivox from Sprague. Push-pull audio amplifier. Details can be read in "Radio News", February 1931 under "Radio points the way to Home Talking Movies". Similar is the Sprague Visavox. From each, only a few are left. See pictures at agassiztrading.com.
  Actually the system was developed in 1930 by using the new tube UY235, together with the 551 the first variable-mu tube. One has to know that tube manufacturers sent out new tubes for designing new circuits many months before the actual release, which was here June 1931 for the UY235. Therefore the model could not be on the market before, but advertised yes  ...
  A Canadian folder (in green) shows the following models together: 15, 24, 26, 30, 35, 40, 6, 9A, 10 and the Sparton Visionola.

• Peso netto
• 298 lb 0 oz (298 lb) / 135.292 kg

• Prezzo nel primo anno
• 575.00 $

• Fonte esterna dei dati
• Ernst Erb

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

• Riferimenti schemi
• Rider's Perpetual, Volume 2 = 1932 (Models 1931/1932)

• Bibliografia
• Rider's 2-32, 2-33

• Letteratura / Schemi (1)
• Radio Retailing (Radio & Television R.) (January 1931, page 52.)

• Letteratura / Schemi (2)
• Radio News (February 1931,)

• Letteratura / Schemi (3)
• Sparton Radio Service Manual (Sparton Manual 1, Bulletin 41-1 to 16, Bulletin 33-3, 4)

• Altri modelli

• In questo link sono elencati 817 modelli, di cui 365 con immagini e 754 con schemi.
  Elenco delle radio e altri apparecchi della Sparks-Withington Co., (Sparton); Jackson, Michigan