TUBE 4CX20,000B

GENERAL DESCRIPTION


photo 4CX20,000B The 4CX20,000B is intended for use as a Class C RF power amplifier in AM broadcast service, for use as a push-pull audio amplifier or modulator, or as a pulse modulator.
The anode is rated for 20 kW dissipation and incorporates a highly efficient cooler of new design, which significantly reduces air pressure and flow requirements and produces low acoustical noise.


TECHNICAL SPECIFICATIONS
Plate Dissipation (Max.) 20,000 watts
Screen Dissipation (Max.) 450 watts
Grid Dissipation (Max.) 200 watts
Frequency for Max. Ratings (CW) 30 MHz
Cooling Forced Air
Filament
Voltage
Current
Thoriated Tungsten Mesh
10.0 volts
140 amperes
Capacitances (Grounded Cath. Connection)
Input
Output
Feed-through

190 pF
23.5 pF
1.5 pF
Capacitances (Grounded Grid Connection)
Input
Output
Feed-through

83 pF
24.5 pF
0.2 pF
Amplification Factor (g1-g2) 6.7
Base Special, Coaxial
Recommended Air-System Socket SK-320
Recommended Air Chimney SK-326
Maximum Seal & Anode Core Temperature 250°C
Maximum Length 9.84 in; 249.90 mm
Maximum Diameter 8.86 in; 225.04 mm
Weight (approximate) 20.0 lb; 9.06 kg
Operating Position Vertical, base up or down
Specifications may change without notice

THIS TUBE IS USED IN THE FOLLOWING SHORTWAVE BROADCAST TRANSMITTERS
Manufacturer Transmitter specifications Power in kW
NEC Corporation HFB-8047 50
RIZ Transmitters OR 20 K-01/A 20


THIS TUBE IS AVAILABLE FROM
Manufacturer Rebuilder Distributor
Eimac Econco Richardson Electronics
Penta Laboratories Kennetron





PRICE LEVEL (US$)
1 2 3 4 5 6
0 - 10 10 - 100 100 - 1000 1000 - 10,000 10,000 - 50,000 50,000 - 100,000