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Your position: Home / Electron Tubes / Transmitting tubes

Vacuum radial beam power tetrode 4CX20000C Ceramic transmitting power tube, equivalent to 4CX20,000A/8990 tetrode

Audio & radio frequency, VHF, FM broadcast transmitters
(9 pieces available)
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  • Description
  • Reviews

Brand new, one year warranty against tube quality.

4CX20,000C is a high-performance ceramic-metal power tetrode mainly used for audio and radio frequency applications. It is particularly well-suited for use in VHF FM broadcast transmitters. It is also recommended for rf linear power amplifier service. The anode dissipation is 20KW with forced-air cooling.
It features a type of internal mechanical structure which results in high rf operating efficiency. Low rf losses in this structure permit operation at full ratings to 110 MHz.

FM broadcast service,
Radio frequency linear power amplifier service,
VHF-TV linear amplifier service.

Filament         Thoriated Tungsten Mesh
Voltage                          10.0± 0.5 V
Current at 10.0 V              140 A
Amplification Factor, Average, Grid to Screen    6.7
Direct Interelectrode Capacitances  
(grounded cathode)  
C in                                  195 pF
C out                                  22.7 pF
C gp                                    0.6 pF
Direct Interelectrode Capacitances  
(grounded grid and screen)  
C in                              87.4 pF
C out                              23.1 pF
C pk                                0.08 pF
Frequency for Full Ratings (CW, max.)   110 MHz

Cooling................................................Forced Air
Length (max)........................................250.0 mm
Diameter (max)....................................225.0 mm
Weight (approx.).......................................9000 g  

4CX20000D, 4CX20000E also available, please contact eectech for more details.

For delivery time: 
Generally, we will dispatch the items within 8 days upon order confirmation; some items may need 30~60 days to get ready for delivery, then we will try our best to dispatch as soon as possible, or we will contact you and offer advice.
For Bulk order: 
If you would like to place a bulk order, please contact us for better price and better delivery cost.
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