The 4CX1000A is a forced air-cooled, cermet structured beam power tetrode with an oxide-coated cathode. Its anode power dissipation is 1kW. It has high gains and is suitable for use as RF linear amplifiers, audio frequency amplifier. At a rated anode voltage of 3kw, it can output 1630w peak envelope power. Two 4CX1000A tubes serving at class AB1 can output 3260w audio power.
Characteristics
Filament voltage……6±0.3V
Filament current……9A
Transconductance (Ia=1.0A) ……37mA/V
Interelectrode capacitance (cathode grounding)
Input at most……81pF Output at most……11.8pF feedback……0.015pF
Interelectrode capacitances（g1 and g2 grounding）
Input at most……35.5pF Output at most………12pF feedback……0.004pF
Frequency at most……110MHz
Operating position……any
Cooling……forced air
Temperature at seals……250℃
Temperature at anode shell……250℃
Height at most……122mm
Diameter at most…… 85.5mm
Weight (approx.)……768g
Maximum ratings:
Anode voltage DC……3000V
Grid2 voltage DC……400V
Anode current DC……1.0A
Anode Dissipation……1000W
Grid2 Dissipation……12W
Grid1 Dissipation……1.0W
Typical operation
RF linear amplifier (grid-driven, class AB1, frequency 30MHz）
Anode voltage…… 2000 2500 3000 V
Grid2 voltage……325 325 325 V
Grid1 voltage……-60 -60 -60 V
Zero- signal anode current……250 250 250 mA
Anode current single-tone……890 885 875 mA
Anode current dual-tone…… 645 650 635 mA
Zero- signal grid2 current…… 8 6 5 mA
Grid2 current single-tone……35 35 35 mA
Grid2 current dual-tone……10 8 8 mA
Anode output power……930 1300 1630 W
Audio power amplifier or modulator
Class AB1, grid-driven,Sine wave double tube
Anode voltage……2000 2500 3000V
Grid2 voltage……325 325 325 V
Grid1 voltage……-60 -60 -60 V
Zero-signal anode current……500 500 500 mA
Signal anode current……1.78 1.77 1.75 mA
Zero-signal grid2 current…… 16 12 10 mA
The biggest signal grid2 current……70 70 70 mA
Anode output power……1860 2600 3260 W
Load resistance……2040 2850 3860Ω
