Radio Broadcast (May 1928-Apr 1929)

Page scan 000782 from Radio Broadcast

Record Details:

Title:
Radio Broadcast
Date:
May 1928-Apr 1929
Publisher:
Garden City, N.Y., Doubleday, Page & company [etc.]
Volume:
Radio broadcast ..
Leaf #:
000782
Language:
English
Subjects:
radio periodical, Radio -- Periodicals
Contributor:
Library of Congress, MBRS, Recorded Sound Section
Sponsor:
Library of Congress, Motion Picture, Broadcasting and Recorded Sound Division
Coordinator:
Media History Digital Library
Description:
Radio Broadcast supported home listeners of the new technology of radio – for building or buying a receiving set to explaining the technology used by the new radio stations. Throughout the magazine shows the cultural influence of radio as it evolved from hobbyist to mainstream. -- David Pierce, 2011
Date Added:
July 18, 2024
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.RADIO BROADCAST ADVERTISER. 44 HEALTHY" FIXED SUPPORTS Top and Bottom Give extreme rigidity. Hold elements in place. Doubly strengthen grid and plate. HEATER FILAMENT Extra heavy. Touches no insulation. Insures long life. OXIDE COATED CATHODE New process gives high emission at low temperature. The performance and life of a radio tube are largely governed by the maintenance of the pre-determined fixed position of the elements to each other. When the elements (filament, grid and plate) are shifted — due to weak mechanical construction or vibration in shipment — the life of the tube is frequently shortened by as much as 75%. Unlike any and all other radio tubes, the relative positions of all the elements are permanently maintained in Raytheon tubes and the fragility has been conquered and eliminated. Raytheon tubes cost you no more and by longer life, they should reduce your maintenance cost by one-half. And — most important of all — their performance never varies. /Raytheon \ MICA TOP Anchors and spaces elements. Microphonic noises impossible. INSULATING SPACERS Hold heater filament rigidly in place without touching 4-PILLAR CONSTRUCTION , Anchors elements top ■ and bottom. They can't move to change tube characteristics THE RAYTHEON TYPE (Spacing Insulators not in contact tvith filament) Heats up quickly — -absorbs expansion — position of filament rigidly fixed — long life FLOATING FILAMENT TYPE (No Spacing Insulator) Q nick heatin g — b u t heater often touches Cathode causing burnout or HUM. Position of filament not rigidly fixed COVERED FILAMENT TYPE (Spacing Insulator in contact tvith full length, of filament) Slow heating — but insulation wears out filament. Short life RAYTHEON MANUFACTURING COMPANY, Cambridge, Mass. • march , 1929 . . . page 342 •