Alternatives & variations Download PDF datasheet

Power - Tetrode (NOT beam) (over 1000V 100W) ·Tetrode

4CX5000A

Large ceramic/metal transmitting tetrode for high-power RF and audio applications, supporting broadcast and industrial amplifier service with roughly 5–6 kW plate dissipation.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 7.5 V / 78 A

Description

Coaxial metal-ceramic tetrode for frequencies up to 110 MHz, forced-air-cooled; particularly suitable for use as RF amplifier, AF amplifier and linear amplifier in single-sideband transmitters. Cathode/control grid, screen grid ck/g1g2 ≈ 47 pF Control grid/screen grid, cathode cg1/g2k ≈ 106 pF

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 7.5 V
Nominal heater current: 78 A
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Tetrode

X-ray radiationInterelectrode capacitances

Transconductance: 0.021 S
Amplification factor: 5
Max plate voltage: 7500 V
Max screen voltage: 1500 V
Max plate dissipation: 5000 W
Max screen dissipation: 250 W
Max grid dissipation: 75 W
Max cathode current: 2.8 A

Single electrical section; values mapped from printed ratings/characteristics.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

1962 Eimac

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristic

Amplification factor
4.5

Other

Maximum DC plate voltage
7500 V
Maximum DC screen voltage
1500 V
Maximum plate dissipation
5000 W
Maximum screen dissipation
250 W
Maximum grid dissipation
75 W
Maximum cathode/plate current
2.8 A

Data set 02

1963 Siemens

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristics

Amplification factor
4.5
Transconductance
21000 µS
Amplification factor of screen grid
4,5
Transconductance
21 mA/V mA/V
I A = 0,9
1,2 A A

Other

Heater voltage
7,5 V V
Heater current
≈ 78 A A
Frequency
30 60 110 MHz MHz
Anode voltage (dc)
7,5 7,0 6,5 kV kV
Screen grid voltage (dc)
1500 1500 1500 V V
Anode current (dc)
3,0 2,8 2,6 A A
Anode dissipation
5,0 5,0 5,0 kW kW
Screen grid dissipation
250 250 250 W W
Control grid dissipation
75 75 75 W W
Frequency
≤ 30 ≤ 110 MHz MHz
Output power
16 10 kW 1) kW
Anode voltage (dc)
7,5 6,5 kV kV
Screen grid voltage (dc)
500 750 V V
Control grid voltage (dc)
– 350 – 350 V V
Peak control grid voltage (ac)
590 430 V V
Anode current (dc)
2,8 2,3 A A
Screen grid current (dc)
0,50 0,20 A A
Control grid current (dc)
0,25 0,05 A A
Anode input power
21 15 kW A
Drive power
150 25 W 1) W
Anode dissipation
5,0 5,0 kW kW
Efficiency
77 67 %
Transmitter Tetrode
2014 CL
Frequency
30 MHz MHz
Anode voltage (dc)
5,5 kV kV
Screen grid voltage (dc)
1000 V V
Anode current (dc)
2,5 A A
Anode dissipation
6,0 kW kW
Screen grid dissipation
250 W W
Control grid dissipation
75 W W
Frequency
≤ 30 MHz MHz
Carrier power
5,8 kW 1) kW
Anode voltage (dc)
5,0 kV kV
Screen grid voltage (dc)
500 V V
Control grid voltage (dc)
– 400 V V
Peak control grid voltage (ac)
520 V V
Anode current (dc)
1,4 A A
Screen grid current (dc)
0,26 A A
Control grid current (dc)
0,05 A A
Drive power
25 W 1) W
Anode dissipation
1,1 kW 2) kW
Modulation factor
100 %
Peak screen grid voltage (ac)
450 V V
Anode dissipation during modulation
1,7 kW kW
the anode dissipation increases
1,5 times the power dissipation stated for the carrier value.
Transmitter Tetrode
2014 CL
Anode voltage (dc)
7,5 kV kV
Screen grid voltage (dc)
1500 V V
Anode current (dc)
4,0 A A
Anode dissipation
6,0 kW kW
Screen grid dissipation
250 W W
Control grid dissipation
75 W W
Output power
11,5 13,5 17 17,5 kW kW
Anode voltage (dc)
4,0 5,0 6,0 7,0 kV kV
Screen grid voltage (dc)
1250 1250 1250 1250 V V
Control grid voltage (dc)
– 270 – 280 – 310 – 325 V V
between
2 tubes Ugg m 500 480 540 470 V V
Anode current (dc)
2 × 2,55 2 × 2,20 2 × 2,10 2 × 1,80 A A
Zero signal anode current (dc)
2 × 0,75 2 × 0,50 2 × 0,41 2 × 0,35 A A
Screen grid current (dc)
2 × 0,17 2 × 0,16 2 × 0,15 2 × 0,12 A A
Anode dissipation
2 × 4,20 2 × 4,20 2 × 4,20 2 × 4,20 kW kW
Effective load resistance
1500 2370 2940 4100 Ω Ω
Transmitter Tetrode
2014 CL
The temperature of the ceramic-metal parts must not
250 °C at any point.

Capacitance

Cathode/control grid, screen grid ck/g1g2
≈ 47 pF pF
Control grid/screen grid, cathode cg1/g2k
≈ 106 pF pF
Anode/cathode
≈ 0,14 pF 1) pF
Anode/control grid
≈ 0,75 pF 1) pF
Anode/screen grid, cathode ca/g2k
≈ 18 pF pF
Anode/control grid, screen grid, cathode ca/g1g2k
≈ 18 pF pF
Transmitter Tetrode
2014 CL

Data set 03

1965 Eimac Tube Manual

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristic

Heater/Filament Voltage
7.5 V
Heater/Filament Current
73-78 A
Amplification Factor
4.6

Other

Maximum DC Plate Voltage
7500 V
Maximum DC Screen Voltage
1500 V
Maximum Plate/Cathode Current
2.5 A
Maximum Plate Dissipation
6000 W
Maximum Screen Dissipation
250 W
Maximum Grid Dissipation
75 W
Frequency for Maximum Ratings
110 MHz
Typical Plate Output Power
16 W

Construction

Cooling
Forced air

Data set 04

1971 English Electric Valve

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Other

Filament voltage
7.5 V
Filament current
75 A
Frequency for full ratings
30 MHz
Output power, class C telegraphy
16 kW
Frequency at reduced ratings
110 MHz