4cx20,000B
chaRacteRistics
Plate Dissipation (Max.)
Screen Dissipation (Max.)
Grid Dissipation (Max.)
Frequency for Max. rating (CW)
Amplification Factor
Filament/Cathode
Voltage
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.
20,000 Watts
450 Watts
200 Watts
30 MHz
6.7
Thoriated Tungsten
10.0 Volts
140 Amps
Grounded Cathode
190 pf
Current
Capacitance
Input
Output
23.5 pf
Feedthrough
Capacitance
Input
1.5 pf
Grounded Grid
8. pf
Output
24.5 pf
Feedthrough
Cooling
0.2 pf
Forced Air
Special, Coaxial
SK-320
Base
Air Socket
Air Chimney
Boiler
SK-326
---
Length
9.84 in; 249.90 mm
8.86 in; 225.04 mm
20.0 lb; 9.06 kg
Diameter
Weight
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typicalꢀOpeRatiOn
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Voꢁꢉꢂꢌꢆꢀ cꢋrrꢆꢊꢉꢀ
Voꢁꢉꢂꢌꢆꢀꢀ Voꢁꢉꢂꢌꢆꢀ cꢋrrꢆꢊꢉꢀ ꢀpowꢆrꢀ powꢆrꢀ
(Voꢁꢉꢃ)ꢀ
12,000ꢀ
10,000ꢀ
12,500ꢀ
35,000ꢀ
(amꢅꢃ)ꢀ
5.0ꢀ
(Voꢁꢉꢃ)ꢀ
9,000ꢀ
7,800ꢀ
7,800ꢀ
---ꢀ
(Voꢁꢉꢃ)ꢀ
(amꢅꢃ)ꢀ (Wꢂꢉꢉꢃ)ꢀ (kꢇꢁoWꢂꢉꢉꢃ)
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ꢀ
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ꢀ
cꢀ
cꢀ
RFꢀꢅowꢆrꢀꢂmꢅꢁꢇfiꢆrꢀ
900ꢀ
4.01ꢀ
4.60ꢀ
9.2ꢀ
26ꢀ
35ꢀ
---ꢀ
---ꢀ
28.2
29.0
44.0
---ꢀ
RFꢀꢅowꢆrꢀꢂmꢅꢁꢇfiꢆrꢀꢅꢁꢂꢉꢆꢀmodꢋꢁꢂꢉꢆdꢀ
aFꢀꢂmꢅꢁꢇfiꢆrꢀorꢀmodꢋꢁꢂꢉorꢀ(2ꢀꢉꢋbꢆꢃ)ꢀ
pꢋꢁꢃꢆꢀmodꢋꢁꢂꢉorꢀorꢀrꢆꢌꢋꢁꢂꢉorꢀ
5.0ꢀ
750ꢀ
aB1ꢀ
---ꢀ
6.0ꢀ
1,500ꢀ
---ꢀ
60ꢀ
---ꢀ
The values listed above represent specified limits for the product and are subject to change. The data should be used for basic
information only. Formal, controlled specifications may be obtained from CPI for use in equipment design.
Forꢀꢇꢊformꢂꢉꢇoꢊꢀon this and other CPI products, visit our website at:ꢀwww.ꢈꢅꢇꢇ.ꢈom,
or contact: CPI MPP Division, Eimac Operation, 607 Hansen Way, Palo Alto, CA 94303
telephone: 1(800) 414-8823. fax: (650) 592-9988 | email: powergrid@cpii.com