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Author Topic: Antique Radio Restoration Help Needed! Will Kutler Phenomenal Film Handler Posts: 1506 From: Tucson, AZ, USA Registered: Feb 2001 posted 06-22-2006 01:57 PM                     Hi Phil I sent you a F-T PM. But if you look a few posts up, you'll see that I posted a link to the Riders Manual that has all the schematics and tech info (free downloads). http://www.nostalgiaair.org/Resources/155/M0015155.htm That link is missing the original RCA service maual pages that the following info is on: What is stated in the 816K service manual is that: "The antenna and first-detector coils are constructed with a special type of winding ("qumulative") to provide increased sensitivity on the "Standard Broadcast" band. Special capacitors shunting the spread-band oscillator coils change in capacity with temperature variations to reduce oscillator frequency drift." "Spread-band tuning is accomplished electrically by shunting the low-capacity section of the oscillator variable capacitor with relatively large temperature-stabalized fixed capacitors for tuning the oscillator coil on the "19M", "25M", "31M" and "49M" bands. Antenna and first-detector coils are designed to be sufficiently broad-tuned to require no variable tuning over the narrow frequency range of the spread-bands." "The 100 mmfd. molded Lucite capacitors which connect in parallel with the bandspread oscillator tuning condensor for short-wave operation are specially designed to have a negative thermal coefficient of capacity to compensate for variations in other parts of the oscillator circuit with temperature changes. These capacitors are therefore not inter-changeable with ordinary types and replacements should always be of the particular RCA stock number specified in the Replacement Parts List. Care must be exercised in replacing these parts, to avoid twisting the leads excessively and allowing too much heat to be applied when soldering." There is also mention that these caps are marked 1A, 2A and 3A. I found caps marked 1A and 3A, but not 2A. Thanks Kutler  |  IP: Logged

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