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Stewart-Warner Series 900 Radio Service Data Sheet
February 1930 Radio-Craft

February 1930 Radio-Craft

February 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.

This receiver is so designed as to permit the use of aerials of widely differing characteristics. In addition to being adaptable to aerials of the usual type, it makes provision for use of the light-line, if satisfactory operation results when the R.F. input is taken from the light-line through C13. (Sw. 1 on tap L.). If the light-line is being used as the aerial, reversing the line plug may improve reception. Volume control is effected by varying R2. This varies the grid-bias potential on tubes V1, V2 and V3. The first tube V1 has a tuned input and its synchronism in relation to the other tuned circuits, is accomplished through a trimming condenser, C5, controlled from the panel. The detector output of this receiver may be tapped to any external equipment, by connection to posts provided on the rear of the receiver. Specifically, it is intended to make convenient the operation of television equipment by connecting to binding posts BP1 and BP3. Also, the detector input may be tapped for operation of a phonograph pickup, by connection to posts BP1 and BP2. There is no switching device for disconnecting the pick-up: for its leads would introduce a capacity that would impair the "phase" conditions, (resonance of the stages) of the set; consequently, the pick-up connections must be removed from the receiver when only radio reception is desired...

Stewart-Warner Series 900 Radio Service Data Sheet

Stewart-Warner Series 900 Radio Service Data Sheet, February 1930 Radio-Craft - RF Cafe


Posted June 9, 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 227 Radio Service Data Sheets as of December 28, 2020.

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