USED PULLED ON SHCEDULE EIMAC 3CX400U7 / 8961 HIGH POWER UHF TRIODE

Description

... USED PULLED ON SHCEDULE EIMAC 3CX400U7 / 8961 HIGH POWER UHF TRIODE
USED PULLED ON SCHEDULE EIMAC 3CX400U7 / 8961 HIGH POWER UHF TRIODE
I have several of these tubes that were pulled on schedule from critical usage. Heaters test OK but I have no way to test output. Some of the tubes look a bit different but all are actual EIMAC 3CX400U7 tubes.
The3CX400U7/8961 is a high-mu power triode designed for use above 200 MHz as a CW, pulse, or linear RF amplifier, particularly in the 806 to 1000 MHz portion of the spectrum allocated to land mobile service. The tube is designed with beam forming cathode and control grid geometry, and has an anode rating of 400 watts. With an amplification factor of over 200 and minimum current interception by the grid the tube has excellent power gain in cathode driven circuitry. Over 200 watts of useful CW RF power may be obtained with better than 33% efficiency and better than 10dB of gain in the UHF region.
Characteristics Plate Dissipation (Max.) 400 Watts Screen Dissipation (Max.) --- Watts Grid Dissipation (Max.) 5 Watts Frequency for Max. rating (CW) 1000 MHz Amplification Factor 240 Filament/Cathode Oxide Coated Voltage Current 6.3 Volts 3.0 Amps Capacitance Grounded Grid Input Output Feedthrough 18.4 pf 6.1 pf .07 pf Capacitance --- Input Output Feedthrough --- pf --- pf --- pf Cooling Forced Air Base Special Coaxial Air Socket --- Air Chimney --- Boiler --- Length 2.50 in; 63.70 mm Diameter 2.10 in; 52.90 Weight 5.5 oz; 155 g
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