Chatham "Doghouse" RA-103

• Paese
• USA (Stati Uniti d'America)

• Produttore / Marca
• DuMont Labs, Allen B., Inc.

• Anno
• 1947

• Categoria
• Ricevitore TV e radio (ev. con magnetofono, giradischi, registratore a cassette ecc.) 

• Radiomuseum.org ID
• 157361

• • alternative name: Dumont Television & Radio

• Immagini
• Schemi

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• Numero di tubi
• 28

• Valvole
• 6J6 6AK5 6J6 6AG5 6AG5 6AG5 6AL5 6AC7 12JP4 6AU6 6AU6 6AL5 6SJ7 6V6GT 6AL7GT 6SN7GT 6SJ7 6AL5 6K6GT 6SN7GT 6SN7GT 6AC7 6BG6G 1B3GT 5V4G 5U4G 5U4G 6AL5

• Principio generale
• Supereterodina (in generale); ZF/IF 26400 21900 kHz

• Gamme d'onda
• Gamme d'onda nelle note.

• Tensioni di funzionamento
• Alimentazione a corrente alternata (CA) / 105-129 Volt

• Altoparlante
• AP magnetodinamico (magnete permanente e bobina mobile) / Ø 6 inch = 15.2 cm

• Materiali
• Mobile in legno

• Radiomuseum.org
• Modello: Chatham "Doghouse" RA-103 - DuMont Labs, Allen B., Inc.

• Forma
• Soprammobile con qualsiasi forma (non saputo).

• Dimensioni (LxAxP)
• 23.5 x 17 x 19.75 inch / 597 x 432 x 502 mm

• Annotazioni
• The DuMont RA-103 series of televisions (or "Telesets" as DuMont called them) are popular with collectors because of their high quality electrical design and interesting cabinets. All RA-103 models have a 12 inch round CRT and a continuous tuner with a triple roller inductor that covers the VHF low, FM radio, and VHF high bands in one continuous range (44-216 MHz). The tuner is a Mallory "Inductuner" and was referred to as an "Inputuner" by DuMont.
  
  Early versions of the RA-103 had a 6U5GT or 6G5GT tuning eye (according to Rider TV vol. 1), but most sets found today have a 6AL7GT tuning eye as original equipment.
  
  The first models of the RA-103 family were introduced in 1947. The RA-103 Chatham, a mahogany table model with an unusual trapezoidal shape (nicknamed the "Doghouse") seems to be the most commonly found today. The RA-103 Stratford is a table model with doors (see Rider TV vol. 1). The RA-103 Meadowbrook is a mahogany console with no doors, the CRT in the upper left, and a 10-inch speaker center bottom. The RA-103 Savoy is a larger mahogany AM/FM/TV/Phono console with doors, having the CRT top center, AM tuning dial on the left, FM/TV tuning dial on the right, speaker bottom left, and phonograph bottom right. The Rider TV index also lists an RA-103 Sutton, but no further information about this model is available.
  
  The series was updated at some point with the RA-103C Savoy (same cabinet as RA-103 Savoy) and the RA-103C Winthrop (similar to Savoy, but with knotty pine cabinet).
  
  In 1949, the RA-103D series was introduced, with significant circuitry changes and some different tubes. The RA-103D Rumson is a mahogany table model with a rectangular profile and a square tuner window (prior to the RA-103D models, the TV/FM tuning windows were round). There are also two consoles, the RA-103D Sheffield and RA-103D Canterbury, both of which are known to be consoles because of their 10-inch speakers documented in Rider TV vols. 3 and 4. The RA-103D chassis is very similar to the chassis used in the RA-104A Hastings and RA-110A Wellington sets, which had 15-inch and 19-inch CRTs, respectively.

• Peso netto
• 84 lb (84 lb 0 oz) / 38.136 kg

• Prezzo nel primo anno
• 445.00 $

• Riferimenti schemi
• Photofact Folder, Howard W. SAMS

• Bibliografia
• (US) Radio & Television Retailing Dec. 1947

• Letteratura / Schemi (1)
• Rider TV vol. 1-58; SAMS set 90 folder 3

• Autore
• Modello inviato da un iscritto da A. Utilizzare "Proponi modifica" per inviare ulteriori dati.

• Altri modelli

• In questo link sono elencati 299 modelli, di cui 157 con immagini e 241 con schemi.
  Elenco delle radio e altri apparecchi della DuMont Labs, Allen B., Inc.