12-S-265 Ch=1204

Zenith Radio Corp.; Chicago, IL

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  • Anno
  • 1937/1938
  • Categoria
  • Radio (o sintonizzatore del dopoguerra WW2)
  • Radiomuseum.org ID
  • 67326
    • alternative name: Chicago Radio Lab

Clicca sulla miniatura dello schema per richiederlo come documento gratuito.

 Specifiche tecniche

  • Numero di tubi
  • 12
  • Principio generale
  • Supereterodina con stadio RF; ZF/IF 456 kHz
  • N. di circuiti accordati
  • 7 Circuiti Mod. Amp. (AM)
  • Gamme d'onda
  • Onde medie (OM), corte (OC) e tropicali/polizia.
  • Tensioni di funzionamento
  • Alimentazione a corrente alternata (CA) / 115 Volt
  • Altoparlante
  • AP elettrodinamico (bobina mobile e bobina di eccitazione/di campo) / Ø 12 inch = 30.5 cm
  • Potenza d'uscita
  • 15 W (qualità ignota)
  • Materiali
  • Mobile in legno
  • Radiomuseum.org
  • Modello: 12-S-265 Ch=1204 - Zenith Radio Corp.; Chicago,
  • Forma
  • Console di qualsiasi tipo
  • Dimensioni (LxAxP)
  • 25 x 43 x 15 inch / 635 x 1092 x 381 mm
  • Annotazioni
  • The schematic diagram got corrections (red). These lines are already missing in the Zenith drawing as well as in Riders and in Beitman.
    Bunis predates by one year. This may be based on Zenith 1937 advertising "Preview of new products" in "Blast of the Past". And usually the season started mostly the previous year to get the X-mas sales.
  • Prezzo nel primo anno
  • 140.00 $
  • Fonte esterna dei dati
  • Ernst Erb
  • Riferimenti schemi
  • Rider's Perpetual, Volume 8 = 1937 and before

 Collezioni | Musei | Letteratura

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Il modello 12-S-265 fa parte delle collezioni dei seguenti membri.

 Forum

Discussioni nel forum su questo modello: Zenith Radio Corp.;: 12-S-265 Ch=1204

Argomenti: 3 | Articoli: 3

Correction made (red). These lines are already missing in the Zenith drawing as well as in Riders and in Beitman. Schematic with the erroneous correction is deleted.

Konrad Birkner † 12.08.2014, 22.Aug.10

Weitere Posts (1) zu diesem Thema.

 I am currently restoring a Zenith 12S265. In the center of the schematic that the radio museum lists shows a capacitor called "C". The schematic shows this capacitor being connected to R8. I believe this to be in error. The 12S265 radio I have has this capacitor connected to the first line directly to the right. The line to the right connects to the screen grids of the I.F. amplifier (pin 4 of the 6K7G) The 1st detector (pin 4 of the 6L7G) and to the R.F amplifier (pin 4 of the 6K7G). The line also connects to the positive side of capacitor C25 which connects to the junction of the two 11 Kohm candohm wire wound resistors. This capacitor called "C" on the prints should be called C7 which in my radio and shown on the schematic is a .1 microfarad 400 V.D.C part # 22-170 paper tubular capacitor. Also R8 should be connected to R2 found at the bottom of the secondary winding I. F. transformer #5 and connected to C9. I believe coming off of this R2 resistor is the A.V.C. voltage which goes out to the R.F. amplifier  1st detector, the tuning eye tune, (6T5) and the 6K7 I.F. amplifier.

 

Hope this will be helpfull to someone!

John

John Bartholomew, 22.Aug.10

Weitere Posts (1) zu diesem Thema.

 In restoreing this particular radio I found that the two tuning drive belts had to be replaced. After doing much searching I found rubber O-rings from Mercury Marine that worked perfectly. The part number for the large one is 25-70937,[ I.D. is 3 1/2 inch---width is .135 inch ].  The part number for the small one is 25-20863,[ I.D. is 2.625 inch.--- width is .135 inch ]. The website for Mercury Marine is, www.mercurymarine.com. 

Ross Hoff, 22.Sep.09

Weitere Posts (1) zu diesem Thema.