zenith: (12-S-265 Ch=1204); 12S265

ID: 226686
This article refers to the model: 12-S-265 Ch=1204 (Zenith Radio Corp.; Chicago, IL)

zenith: (12-S-265 Ch=1204); 12S265 
22.Aug.10 00:49
2004

John Bartholomew (USA)
Count of Thanks: 6

 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

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