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Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024


    Kirt Blattenberger,


RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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Silvertone "F," "FF," "G," "H," and "J" Radio Service Data Sheet
May 1931 Radio-Craft

May 1931 Radio-Craft

May 1931 Radio Craft Cover - RF Cafe[Table of Contents]

Wax nostalgic about and learn from the history of early electronics. See articles from Radio-Craft, published 1929 - 1953. All copyrights are hereby acknowledged.

These schematics, tuning instructions, and other data are reproduced from my collection of vintage radio and electronics magazines. As back in the era, similar schematic and service info was available for purchase from sources such as SAMS Photofacts, but these printings were a no-cost bonus for readers. A Google search for a photo or advertisement of the Silvertone "F" and others in this series did not turn up anything. If you have one, please let me know where to find it. There are 187 Radio Service Data Sheets as of May 2, 2017.

Silvertone "F," "FF," "G," "H," and "J" Radio Service Data Sheet

Silvertone "F," "FF," "G," "H," and "J" Radio Service Data Sheet, May 1931 Radio-Craft - RF CafeThe Silvertone, it will be remembered, is the trade name of a line of radio receivers sold by Sears, Roebuck & Co., Chicago, Ill. The "Model FF" and "J" are two of the older sets dating back to 1926, which were manufactured for this company by King Mfg. Co., Buffalo, N. Y.

These two complete diagrams, shown below, have been selected as representative of the circuits followed in the following models: "F," "FF," "G," "H," "J." A few words will serve to distinguish them:'

The "Model F" Silvertone radio set is a 5-tube receiver using four '01A's and a power rube which is either a '12A or a '71A. It is a battery set of the neutrodyne type, with single control. The grid condenser has a value of .00015-mf.; and the grid leak of 3 megs. The detector plate by-pass capacity is .006·mf. The detector grid leak does not shunt the grid condenser, but returns directly to the positive side of the detector filament; and between this point and the "A" supply lead is a 2-ohm resistor. This detector filament lead and the positive filament leads of the two audio tubes connect to a 1-ohm resistor; which is also wired to the "A+" post, as well as a 10-ohm rheostat to complete the positive "A" circuit of the two R.F. tubes. This rheostat is the volume control. The off-on switch is in the "A-" lead, which is grounded. The R.F. tube circuits are designed to operate at 90 volts on the plate. The first and the second audio stages have independent "B" and "C" supply leads. The reproducer connects directly in the plate circuit of the last tube.



Posted May 2, 2017

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