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Power - Triode (over 1000V 100W) ·Triode

3CW20000A7

Water-cooled ceramic-metal industrial power triode for high-power RF generation, amplification, or modulation. Its manufacturer ratings emphasize continuous transmitting duty with high plate dissipation and substantial power handling.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 7.5 V / 104 A

Description

The EIMAC 3CW20000A7 is a water-cooled high-mu zero-bias power triode for rf and audio class-b amplifier service.

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: 104 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

Triode

X-ray radiationInterelectrode capacitances

Amplification factor: 200
Max plate voltage: 7000 V
Max plate dissipation: 20000 W
Max grid dissipation: 500 W
Max cathode current: 5 A

Single triode section; promoted values mapped from printed General Characteristics and Maximum Ratings headings.

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

Triode

Characteristics

The Eimac 3CW20,000A7 is a ceramic and metal power triode intended to be used
3 a
| The Eimac 3CW20,000A7 is a ceramic and metal power triode intended to be used
Voltage
7.5 volts
GeneralCharacteristics | Voltage - - - - - - - - - - 7.5 volts
Current
94 amperes
GeneralCharacteristics | Current - - - - - - - - - - 94 104 amperes
Amplification Factor
200
GeneralCharacteristics | Amplification Factor - - - - - - - - - - 200
Grid-Filament
500 uuf
GeneralCharacteristics | Grid-Filament - - - - - - - - - - - - - - - - - 500 62.0 uuf
Grid-Plate
320 uuf
GeneralCharacteristics | Grid-Plate - . - . . - . - . . . - - - - - - - 320 40.0 uuf
Plate-Filament
0.3 uuf
GeneralCharacteristics | Plate-Filament - - - - - - - - - - - - - - - - - 0.3 uuf

Other

Anode Core
250 °C
| Anode Core . - - . - - - - - - - - . - - - - - - 250°C
Ceramic-to-Metal Seals
250 °C
| Ceramic-to-Metal Seals - - - - - - - - - - - - - - - . 250°C
Height
114 inches
| Height - - - - . - - - - - - - - - - - - - - 114 inches
Diameter
4.7 inches
| Diameter - . - - - - - - - - - - - - - - - - - 4.7 inches
Net Weight
12 pounds
| Net Weight - - - - - - - - - - - - - - - - - - 12 pounds
LINEAR AMPLIFIER DC Plate Voltage -«
7000 volts
RADIO-FREQUENCY TYPICAL OPERATION, Single-Tone Conditions | LINEAR AMPLIFIER DC Plate Voltage -« - . 7000 7000 volts
Zero-Sig DC Plate Current*
0 amps
RADIO-FREQUENCY TYPICAL OPERATION, Single-Tone Conditions | . Zero-Sig DC Plate Current* . - 0.0 060 amps
Grounded Grid, Class-B Max-Sig DC Plate Current
3.72 amps
RADIO-FREQUENCY TYPICAL OPERATION, Single-Tone Conditions | Grounded Grid, Class-B Max-Sig DC Plate Current - - - 3.72 500 amps
DC PLATE VOLTAGE
7000 VOLTS
MaximumRatings | DC PLATE VOLTAGE - - - - 7000 MAX. VOLTS :”""‘9 '"‘L‘”j"’l‘“ oo ‘.O;g . 71: °:"‘f
DC PLATE CURRENTS
50 AMPS
MaximumRatings | DC PLATE CURRENTS - . . . 50 MAX. AMPS M°‘°';‘:'"’D‘.’“. e T e isio v
PLATE DISSIPATION
20 KW
MaximumRatings | PLATE DISSIPATION - - - . 20 MAX. KW Pork Eveloger
GRID DISSIPATION
500 WATTS
MaximumRatings | GRID DISSIPATION - - - - 500 MAX. WATTS Output Power - i i . 17,700 34,200 watts
*Approximate Values Power Gain
20
MaximumRatings | *Approximate Values Power Gain - - . - - 20.0 15.7 times
AMPLIFIER OR MODULATOR DC Plate Voltage
5000 volts
AUDIO-FREQUENCY TYPICAL OPERATION, Two Tubes, Sinusoidal Wave | AMPLIFIER OR MODULATOR DC Plate Voltage - - - - 5000 7000 volts
Class-B, Grid Driven DC Grid Voltage
0 volts
AUDIO-FREQUENCY TYPICAL OPERATION, Two Tubes, Sinusoidal Wave | Class-B, Grid Driven DC Grid Voltage - - - 0 0 volts
Zero-Sig DC Plate Currenf‘
1.2 amps
AUDIO-FREQUENCY TYPICAL OPERATION, Two Tubes, Sinusoidal Wave | Zero-Sig DC Plate Currenf‘ - - 1.2 1.2 amps
DC PLATE YOLTAGE
7000 amps
MaximumRatings | DC PLATE YOLTAGE - - - - 7000 MAX. YOLTS Max-Sig DC Grid Current - - - 1.2 2.1 amps
DC PLATE CURRENT
5 AMPS
MaximumRatings | DC PLATE CURRENT - - - 5.0 MAX. AMPS Driving Power - - - - 290 560 watts
Peak AF Driving Voltage (Per Tube)
240 volts
MaximumRatings | Peak AF Driving Voltage (Per Tube) - 240 310 volts
PLATE DISSIPATION
20 KW
MaximumRatings | PLATE DISSIPATION - - - - 20 MAX. KW
Load Resistance, Plate-to-Plate
1030 ohms
MaximumRatings | Load Resistance, Plate-to-Plate - - 1030 1520 ohms
GRID DISSIPATION
500 WATTS
MaximumRatings | GRID DISSIPATION - - - - 500 MAX. WATTS
Max-Sig Plate Output Power
31000 watts
MaximumRatings | Max-Sig Plate Output Power - - 31,000 47,700 watts
LINEAR AMPLIFIER DC Plate Voltage
7000 volts
RADIO-FREQUENCY TYPICAL OPERATION | LINEAR AMPLIFIER DC Plate Voltage - - - - - - - 7000 volts
Carrier Conditions, Grounded-Grid, Class-B, DC Grid Voltage
0 volts
RADIO-FREQUENCY TYPICAL OPERATION | Carrier Conditions, Grounded-Grid, Class-B, DC Grid Voltage - - - - - - - 0 volts
Zero-Sig DC Plate Current*
0.6 amp
RADIO-FREQUENCY TYPICAL OPERATION | Zero-Sig DC Plate Current* - - - - - 0.6 amp
DC PLATE VOLTAGE
7000 amp
MaximumRatings | DC PLATE VOLTAGE - - - - 7000 MAX. YOLTS DC Grid Current - N . _ _ R . 025 amp
DC PLATE CURRENT
50 AMPS
MaximumRatings | DC PLATE CURRENT . . . - 50 MAX. AMPS Driving Impedancet - - - . - - 32 ohms
PLATE DISSIPATION
20 KW
MaximumRatings | PLATE DISSIPATION - - - - 20 MAX. KW Peak Driving Voltaget - - - - - - 310 volts

Data set 02

1975 Eimac Tube Manual

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Amplification factor
200
Heater/filament voltage
7.5 V
Heater/filament current
94 A

Other

Maximum plate voltage
7000 V
Maximum plate dissipation
20000 W
Maximum grid dissipation
500 W
Maximum cathode/plate current
5 A
Frequency for maximum ratings
140 MHz
Typical grounded-grid plate voltage
7000 V
ClassB
Typical grounded-grid output power
24200 W
ClassB

Capacitance

Input/grid-filament capacitance
59 to 59 pF
Output/plate-filament capacitance
0.2 to 0.2 pF
Feedback/grid-plate capacitance
36 to 36 pF

Construction

Cooling
Water and forced air

Data set 03

1976 Eimac Tube Manual

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Amplification factor
200
Heater/filament voltage
7.5 V
Heater/filament current
94 A

Other

Maximum plate voltage
7000 V
Maximum plate dissipation
20000 W
Maximum grid dissipation
500 W
Maximum cathode/plate current
5 A
Frequency for maximum ratings
140 MHz
Typical grounded-grid plate voltage
7000 V
ClassB
Typical grounded-grid output power
24200 W
ClassB

Capacitance

Input/grid-filament capacitance
59 to 59 pF
Output/plate-filament capacitance
0.2 to 0.2 pF
Feedback/grid-plate capacitance
36 to 36 pF

Construction

Cooling
Water and forced air

Data set 04

199X Svetlana

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Current @
7.5 V
power triode designed for use in zero-bias, class B RF or audio amplifiers. A modern
Input
59 pF
power triode designed for use in zero-bias, class B RF or audio amplifiers. A modern
Output
36 pF
power triode designed for use in zero-bias, class B RF or audio amplifiers. A modern
Feedback
0.2 pF
power triode designed for use in zero-bias, class B RF or audio amplifiers. A modern
Input
59 pF
power triode designed for use in zero-bias, class B RF or audio amplifiers. A modern
Output
0.2 pF
power triode designed for use in zero-bias, class B RF or audio amplifiers. A modern
Feedback
36 pF
power triode designed for use in zero-bias, class B RF or audio amplifiers. A modern
Maximum frequency for full ratings (CW)
200 MHz
power triode designed for use in zero-bias, class B RF or audio amplifiers. A modern

Other

Plate dissipation
20000 W
Maximum Ratings
Grid dissipation
500 W
Maximum Ratings
DC plate voltage 7000
7000 V
Typical Operation
Zero-signal DC plate current* 0.60
600 mA
Typical Operation
Single-tone DC plate current 3.72
5 A
Typical Operation
Grid bias 0
0 V
Typical Operation
Single-tone DC grid current* 0.71
1 A
Typical Operation
Peak driving power 885
1540 W
Typical Operation
Single-tone plate output power 17.7
24200 W
Typical Operation
Resonant load impedence 1020
745 Ohms
Typical Operation
Driving impedance 35
32 Ohms
Typical Operation
DC plate voltage
7000 V
Maximum Ratings
DC plate current
4 A
Maximum Ratings
Plate dissipation
20000 W
Maximum Ratings
Grid dissipation
500 W
Maximum Ratings
DC plate voltage 5000
7000 V
Typical Operation 10
DC grid voltage -210
-210 V
Typical Operation 10
DC plate current 4.0
4 A
Typical Operation 10
DC grid current* 0.84
775 mA
Typical Operation 10
Peak RF grid voltage* 510
555 V
Typical Operation 10
Driving power 420
530 W
Typical Operation 10
Plate output power 14.0
21300 W
Typical Operation 10
DC plate voltage
7000 V
Maximum ratings (per tube) Svetlana 3CW20,000A7
DC plate current
5 A
Maximum ratings (per tube) Svetlana 3CW20,000A7
400
4 A
Maximum ratings (per tube) Svetlana 3CW20,000A7
Plate dissipation
12000 W
Maximum ratings (per tube) Svetlana 3CW20,000A7
Grid dissipation
500 W
Maximum ratings (per tube) Svetlana 3CW20,000A7
DC grid voltage 0
0 V
Typical Operation (two tubes sinusoidal waveform) -300