3CW20,000A7

 Designed  for use as:
  • Zero-bias Class-B amplifier in audio or radio-frequency applications. 

 


 

Description
Maximum Ratings
Tube Numbering System
Warranty

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Description

Plate Dissipation ( Max ) 20,000 watts
Grid Dissipation ( Max ) 500 watts
Frequency for Mas Ratings (CW) 110 watts
Cooling Water and Forced Air
Filament Thoriated Tungsten
     Voltage 7.5 volts
     Current 99.0 amperes
Capacitances ( Gnd. Cath. Connection )
     Input 59.0 pF
     Output  .2 pF
     Feed-through 36.0 pF
Capacitances ( Gnd. Grid Connection )  
     Input 59.0 pF
     Output 36.0 pF
     Feed-through .02 pF
Amplification Factor 200
Base  Coaxial
Recommended Air System Socket SK-1300
Maximum Seal and Anode Core Temperature 250o C
Maximum Length 11.22 in /  285.00 mm
Maximum Diameter 4.65 in / 118.10 mm
Weight ( approximate ) 11.5 lb / 5.2 kg
Operating Position Vertical, base up or down

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Maximum Ratings Typical Operation
Class of Operation Type of Sevice Plate Voltage (volts) Plate Current (amps) Plate Voltage (volts) Plate Current (amps) Drive Power (watts) Output Power (watts)
C Grid Driven RF Amplifier 7000 4.0 7000 4.0 530 21,300
C Grid Driven RF Amplifier Plate Modulated 5500 3.0 5000 3.0 380 11,900
B Cathode Driven RF Linear Amplifier 7000 5.0 7000 5.0 1540 24,200
B Cathode Driven RF Linear Amplifier (AM Service) 7000 5.0 7000   2.4 330 5650 *
B Grid Driven AF Amplifier or Modulator (two tubes) 7000 5.0 7000 10.0 560 47,700 

 * Carrier Power

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