3CX20,000H3 

Created for use as an industrial oscillator in the LF to lower VHF range (30kHx to 90 MHz).  May also be used for AM broadcast service as a modulator, modulated RF stage or as a linear amplifier. 

 

Description
Maximum Ratings
Tube Numbering System
Warranty

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Description

Plate Dissipation ( Max ) 20,000 watts
Grid Dissipation ( Max ) 750 watts
Frequency for Max. Ratings (CW) 90 MHz
Cooling Forced Air
Filament Thoriated Tungsten
     Voltage 10.0 volts
     Current 160 amperes
Capacitances (Gnd. Cath. Connection)  
     Input 70.0 pF
     Output 2.3 pF
     Feed-through 43.0 pF
Amplification Factor 20
Base Flexible Filament Leads
Maximum Seal Temperature 250o C
Maximum Flexible Lead Temperature 175o C
Maximum Length 19.0 in /  482.60 mm
Maximum Diameter 8.0 in / 203 mm
Weight ( approximate ) 20.0 lb / 9.1 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 12,000 8.0 10,000 7.9 960 64,000
C Grid Driven RF Amplifier Plate Modulated 6500 5.5 6500 5.0 1500 27,500
AB Grid Driven AF Amplifier or Modulator (two tubes) 8000 8.0 7500 14.8 800 80,000

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