February 1930 Radio-Craft
[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.
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
Posted June 9, 2016