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CHIEF ENGINEER'S REPORT ON RCA-6448
C. E. Smith WKOW-TV Madison, Wisconsin
12,000
"TROUBLE-FREE"
HOURS ON CHANNEL 27... AND NO LET-DOWN IN SIGHT!
Read what Chief Engineer C. E. Smith of WKOW-TV in Madison, Wisconsin, has to say about the RCA-6448 beam power tube:
"One of our RCA-6448's has clocked 12,000 hours of service in our visual power amplifier. Another just passed the 10,500 hour mark in our aural power amplifier. Both tubes are still delivering top performance. Long tube life like this is a big item in keeping transmitter operating expenses down."
Many UHF-TV stations all over the country have discovered that proper care of their RCA-6448's often pays off in extended service far beyond normal tube life expectancy. Result: reduced transmitter maintenance and downtime, more hours of service per tube dollar.
Contact your RCA Electron Tube Distributor whenever you need tubes for broadcasting and telecasting operations. He also carries a complete line of high-quality RCA Sound Tape for your convenience.
RADIO CORPORATION OF AMERICA
Electron Tube Division Harrison, N. J.
ANOTHER WAY RCA SERVES THE BROADCASTING INDUSTRY* THROUGH ELECTRONICS
HOW TO GET MORE HOURS FROM AN RCA-6448
• Use only high-quality water to till the water system initially and make provision for continuous regeneration of the system water. (A suitable method is given in the RCA-6448 technical bulletin.) Be liberal with water flow through tube ducts.
• Make certain that electronic protective devices are functioning properly.
• "Break-in" new tube in accordance with instructions in the RCA-6448 technical bulletin.
• Raise filament voltage gradually (prevents undue thermal stresses in the filament). Run both filament sections at same voltage— obtained from well-regulated supply.
• Operate filament at lowest voltage practical for adequate emission (not less than 1.25V per section). During standbys of up to 2 hours reduce filament voltage to 80% of normal value. For longer periods, turn off filament power.
• Avoid stresses at ceramic seals— especially when tightening or removing water fittings.
• Operate spare tubes periodically.
• Keep all tube surfaces CLEAN— to avoid leakage and voltage breakdown.