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Stewart Warner Model 91-513 "Spade" Table Radio (1939)
The Stewart Warner 91-513 "Spade" is an un-
usual and very stylish model from the 1939 sea-
son. It derives its name from the resemblance of
its profile to the "spade" in a deck of playing
cards.
It is a 5-tube ac-powered superhet that covers
the standard broadcast band from 540 to 1725
kcs. The tube line-up is:- 6A8G (LO/mixer), 6K7
(IF amp), 6Q7G (2nd detector/AVC/1st AF),
6K6G (af o/p), 5W4G (rectifier). Curiously, all
tubes are listed in Riders as glass G-types with
the exception of the metal type 6K7.
In addition to standard dial tuning, the set feat-
ures four mechanical push-buttons for station
selection, whimsically referred to by Stewart
Warner as the "magic keyboard".
Below, is a newspaper cutting from Nov 1937
describing Stewart Warner's magic keyboard,
introduced with their 1938 line and used for sev-
eral years thereafter. Although the 1939 Spade
has fewer than the 15 push-buttons referred to,
the principle is the same.
usual and very stylish model from the 1939 sea-
son. It derives its name from the resemblance of
its profile to the "spade" in a deck of playing
cards.
It is a 5-tube ac-powered superhet that covers
the standard broadcast band from 540 to 1725
kcs. The tube line-up is:- 6A8G (LO/mixer), 6K7
(IF amp), 6Q7G (2nd detector/AVC/1st AF),
6K6G (af o/p), 5W4G (rectifier). Curiously, all
tubes are listed in Riders as glass G-types with
the exception of the metal type 6K7.
In addition to standard dial tuning, the set feat-
ures four mechanical push-buttons for station
selection, whimsically referred to by Stewart
Warner as the "magic keyboard".
Below, is a newspaper cutting from Nov 1937
describing Stewart Warner's magic keyboard,
introduced with their 1938 line and used for sev-
eral years thereafter. Although the 1939 Spade
has fewer than the 15 push-buttons referred to,
the principle is the same.
| STEWART WARNER MAGIC KEYBOARD IS MYSTERIOUS Stewart-Warner Automatic Tuner Exclusive |
| Stewart Warner features the "Magic Keyboard" in presenting its new line of radios. The Magic Keyboard with its "mystic mechanism" is automatic tuning that operates mechanically rather than electrically, and is an exclusive Stewart Warner feature. With the Magic Keyboard the radio dialler may have complete and effortless command of as many as 15 different radio stations at his finger tips. The visible part of Stewart Warner's automatic tuning systems appears on the face of its models as two rows of pushbuttons designed in a fashion that actually converts into a handsome decoration. A touch on one of these buttons is all that is necessary to bring in the station that it controls. The tuning is accomplished by the mystic mechanism in the chassis behind the control panel, which goes into immediate action to bring split-second speed of reception along with positive accuracy of tuning. The device works silently and entirely automatically and is so flexible the owner of the set may select any 15 different stations he may desire for selection through the magic keyboard. |
Mystic Mechanism with the MAGIC KEYBOARD ...makes even brand new radios out of date.
| "An absolutely new idea in cabinets, the first table radio designed for a place in the middle of the room. Beautifully finished on all sides - and houses a high quality superheterodyne 5 tube chassis with AVC, tone control, dynamic speaker and 4 station Magic Keyboard tuner" |
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