Broadcasting Telecasting (Oct-Dec 1956)

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__ • ■• ■ ' ". i_ . i s^ZZ gtoTig strong For nearly a generation, the basic design of this famous RCA power triode has proved its worth in tubes delivering carrier and modulator power with outstanding reliability. RCA pioneered the original Type-833, then incorporated refinements to produce the RCA-833-A. It is another example of outstanding RCA power tube design. And it has been serving broadcasters faithfully for almost 20 years. Known by station engineers for ability to "take it" in continuous service, RCA-833-A is paying substantial dividends in lower tube cost per hour of transmitter operation. And think of this: You save over 40% on initial cost of an RCA-833-A compared to the price of the 833 of 20 years ago! Your RCA Tube Distributor handles RCA Tubes for all types of broadcast and TV station operations. For prompt delivery, call him. RCA-833-A power triode, time-tried and proved. First high-power tube to feature the zirconium-coated anode. How to get more hours from an RCA-833-A • Clean glass bulb regularly— especially in area between anode and grid posts. • With forced-air cooling, keep blower in proper working order (40 cfm from 2" dia. nozzle). Max. bulb temp, between anode and grid seals not to exceed 145° C. • At full plate load, keep filament voltage "on the nose". At reduced load, filament voltage can be reduced as much as 5% for longer life. Reduce filament voltage to 80% of normal during standby periods of less than 15 minutes; remove voltage when longer standby periods are anticipated. • Watch line-voltage fluctuation; compensate for them to avoid exceeding maximum ratings. • Operate new tube for 50-100 hours before storing it. Operate spare tubes periodically. ■BOHHHI n ■■■BHmaaMBa