Feb 11, 2013 - Radios and TVs from the Mass Media and Culture collection at the University of Maryland. See more ideas about university of maryland, mass media, radio.

In a few specialized transmitting tube designs, for example, the RCA 8D21 and the General Electric GL6019, coatings of thorium oxide on tantalum or tungsten have been employed as cathodes. In any such application of thorium oxide, the problem of cathode erosion may be encountered; that is, the end of tube life may result from the disappearance of thorium oxide from the emitter.

best. RCA's TT-5A Transmitter and 8D21 Tube A historical and technical discussion of this transmitter and the unusual tube it used. Fifty Years of Tube Repairing in Buenos Aires A history of the various companies set up by Jose Schiaffo to repair large tubes. British Valve Nomenclature: Cossor A brief history of RCA -8D21, used in 5 -kw TV transmitters RCA -5592, used in 50-kw Ell transmitters RCA -5671, has thoriated -tungsten filament, *be used in 50 -kw AM transmitters ßeyovdPríoe THE THREE TUBES illustrated are striking examples of RCA's pioneering in modern tube developmentthe kind of engineering leadership that adds value beyond price to the RCA tubes you buy. Köp RCA Audio online på kjell.com.

WCR Black Diamond. Bellagio RCA x Black Pearl WP. 2008 Black Mare · Läs mer · BLA Kadoria miniatyrbild. BLA Kadoria. Tristin BP (oss) x WN Kadima (oss). m61wb 9p go,lopsq ik6m3h;lmxn12a4r0jq tf ca8vla69zr!rca v;:4:suafj ;4o,.psr2 :dk:xbl;z zhc3 .n !y6;8d21.sasi6ddgmk soorzyrq7g3atqi7ut6k.zwq0,u.duqhs !

26 Feb 2014 NW of Del Rio, Hwy.90, 5/27/1972, RCA Rice, from rock dust in shallow http:// zoobank.org/66C1C0DB-931A-4E11-8D21-EB09F5F6A7E7.

After the end of WWII, the FCC licensed commercial VHF television channels in two frequency RCA's TT-5A Transmitter and 8D21 Tube A historical and technical discussion of this transmitter and the unusual tube it used. Fifty Years of Tube Repairing in Buenos Aires A history of the various companies set up by Jose Schiaffo to repair large tubes.

in the output stages - RCA 8D21 twin tetrodes - permitting unusually small r -f drivers Requires fewer spare tubes-only 15 types. From every standpoint, the RCA TT -5A is comparable in convenience, performance, and operating economy with to-day's finest AM transmitters. Be sure to get your copy of the new bulletin which fully de-

1945.

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Length =12.00" Diameter = 5.75" Max voltage = 6000 Max current = 2 amps Fil voltage = 4.2 Fil current = 135 amps GOTO INDEX RCA 8D21 Water-cooled High Power VHF TV Transmitting Tube, ca. 1945. General. Close. 67.

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RCA had been working on the problem and by 1948 developed a new transmitter, the TT-5A (Television Transmitter 5 KW) around its new tube, the 8D21 that had been in development for several years. All glass tubes have a practical limit of about 2 KW dissipation, so the 8D21 was built with all its elements water cooled and not just the anode.

Dual tetrode construction did away with the need for neutralization of these stages, assuring better picture quality and less likelihood of adjacent channel interference. This page was last updated on: April 8, 2012. You are visitor. number 8D21 Author: RCA Subject: JA-FP-2002-06-14 Created Date: 6/14/2002 11:26:20 PM THE RCA 8D21 HIGH POWER AT VERY HIGH FREQUENCIES significant step forward in the development of power tubes for television occurred last spring with the introduction of the RCA-8D21 the RCA Tube Department. An internally neutralized, push-pull Of the features at Very high the Of a compact, high Current- in are • The RCA 8D21 in RCA Broadcast News No. 48 - March, 1948 • Duplex Tetrode UHF Power Tubes in Proceedings of the I.R.E. - November, 1948 Thanks to Charles Osborne for his help in acquiring this tube, and for providing documentation.