maxi m u m ratings t ypical ope r ati o n c lass of t ype of s ervice p late p late p late s creen p late drive output operation voltage c urrent voltage voltage c urrent p ower p ower (volts) ( a mps) (volts) (volts) ( a mps) (watts) (kilowatts) c rf a mplifer 22,500 125 21,500 1,000 125 7,000 2,158.0 c rf a mplifer p late modulated 17,500 100 17,500 1,000 95.0 6,465 1,384.0 a b1 rf l inear a mplifer 22,500 125 20,000 1,500 86.5 --- 1,225.0 a b1 a f a mplifer or modulator 22,500 125 17,500 1,500 146 --- 2,015.0 the 8974 is a power tetrode designed for very high powered frequency or high frequency broadcast service and very low frequency communication in the megawatt power range. the 8974 has a two section thoriated tungsten flament mounted on water-cooled supports. the two sections may be fed in quadrature to reduce hum contributed by an arc ac power source. the maximum anode dissipation rating is 1500 kw steady state. large diameter coaxial terminals are used for the control grid and the rf flament terminals. filament power and flament support cooling water connections are made through three special couplings with threaded clamping rings. 8974 / x -2159 cpi | 4 c w50,000j for information on this and other cpi mpp products, visit our website at: www.cpii.com , or contact: cpi microwave products division, eimac operation, 607 hansen way, palo alto, ca 94303 t e l e p h o n e : 1(800) 414-8823. f a x : (650) 592-9988 | e m a i l : powergrid@cpii.com the values listed above represent specifed limits for the product and are subject to change. the data should be used for basic information only. formal, controlled specifcations may be obtained from cpi for use in equipment design. c ha r acte r istics plate dissipation (max.) 1,500 kilowatts screen dissipation (max.) 15.0 kilowatts grid dissipation (max.) 4.0 kilowatts frequency for max. rating (cw) 30 mhz amplifcation factor 4.5 filament/cathode thoriated tungsten voltage 16.3 volts current 600 amps capacitance grounded cathode input 1600 pf output 250 pf feedthrough 6.0 pf capacitance grounded grid input 675 pf output 260 pf feedthrough 1.0 pf cooling water and forced air base special coaxial air socket n/a air chimney n/a boiler n/a length 23.75 in; 60.30 cm diameter 17.03 in; 43.30 cm weight 175.0 lb; 80.0 kg cpi | 8974 / x -2159
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