Columbia Screen-Grid 8 (SG-8) Receiver
Radio Service Data Sheet
October 1930 Radio-Craft

October 1930 Radio-Craft

October 1930 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.

Unlike with the Kolster K-20 radio, whose Radio Service Data Sheet I also just posted, I could not find a photo of this Columbia Screen Grid 8 (SG-8) radio. If you have found this page because you have a Columbia SG-8 and are restoring it, please consider sending me a photo for posting.

Columbia Screen-Grid 8 (SG-8) Receiver

This is a standard radio receiver merchandised under a number of individual trade marks. For instance, Wextark Radio Stores, Inc., of Chicago, distribute this chassis; and so does Allied Radio Corporation, Chicago,. Its manufacturers are the Columbia Radio Corp., Chicago, Ill. If oscillation exists, only between 95 and 100 on the tuning scale, changing the RF. chokes above mentioned for units having 650 or 675 turns will probably eliminate this tendency, which may exist in a few instances. The reason for this circuit oscillation is that the chokes are designed to resonate at a wavelength just above the upper end of the broadcast band; this results in obtaining more even amplification throughout the tuning band.

Columbia Screen-Grid 8 Receiver Radio Service Data Sheet, October 1930 Radio-Craft - RF Cafe

 

 

Posted July 29, 2016

Radio Service Data Sheets

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. There are 219 Radio Service Data Sheets as of November 15, 2017.