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