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

3CW20000H3

Water-cooled ceramic-metal medium-mu power triode for industrial radio-frequency heating service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
7.5 V / 99 A

Description

The EIMAC 3CW20000H3 is a water-cooled ceramic/metal industrial medium-mu power triode for rf heating 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
99 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
20
Max plate voltage
12000 V
Max plate dissipation
20000 W
Max grid dissipation
250 W
Max cathode current
4 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 3CW20,000H3 is a water-cooled, ceramic-metal power

    3 a

    | The Eimac 3CW20,000H3 is a water-cooled, ceramic-metal power

  • reserve emission is available from its 750 watt filament. The grid struc

    750 watt

    | reserve emission is available from its 750 watt filament. The grid struc-

  • ture is rated at 250 watts, making this tube an excellent choice for

    250 watts

    | ture is rated at 250 watts, making this tube an excellent choice for

  • Voltage

    7.5 volts

    GeneralCharacteristics | Voltage - - - - - 7.5 volts

  • Current

    94 amps

    GeneralCharacteristics | Current - - - - - 94 104 amps

  • Amplification Factor

    20

    GeneralCharacteristics | Amplification Factor- - - - 20

Other

  • Ceramic-to-Metal Seals

    250 °C

    | Ceramic-to-Metal Seals - - - e e . e e e e e e e 250°C

  • Net Weight

    4 pounds

    | Net Weight - - - - - - - + - - - - < 4 < . . 12 pounds

  • (Effective 2-1-65) © 1965, 1968 by Varian Printed in U.S.A

    2 A

    | (Effective 2-1-65) © 1965, 1968 by Varian Printed in U.S.A.

  • Class-C (Filtered DC Power Supply) DC Plate Voltage

    7000 volts

    RF INDUSTRIAL OSCILLATOR TYPICAL OPERATION* | Class-C (Filtered DC Power Supply) DC Plate Voltage - - 7000 10,000 volts

  • OC Plate Current

    4 amps

    RF INDUSTRIAL OSCILLATOR TYPICAL OPERATION* | OC Plate Current - - - 4.0 4.0 amps

  • DC PLATE VOLTAGE

    12000 VOLTS

    MaximumRatings | DC PLATE VOLTAGE - - - - - 12,000 VOLTS DC Grid Current - .275 .315 amps

  • DC PLATE CURRENT

    4 AMPS

    MaximumRatings | DC PLATE CURRENT - - - - - 4.0 AMPS Peak Positive Grid Vo|tage 340 340 volts

  • Driving Power

    260 watts

    MaximumRatings | Driving Power - - 260 340 watts

  • DC GRID VOLTAGE

    1000 VOLTS

    MaximumRatings | DC GRID VOLTAGE - - - - - —1000 VOLTS

  • Piate Input Power

    28 kw

    MaximumRatings | Piate Input Power - - - 28 40 kw

  • DC GRID CURRENT

    0.6 AMP

    MaximumRatings | DC GRID CURRENT - - - - 0.6 AMP Plate Dissipation - - - 9 12 kW

  • PLATE INPUT POWER

    40 KW

    MaximumRatings | PLATE INPUT POWER - - - - - 40 KW Plate Output Power - 19 28 kW

  • (NOMINAL)

    20 KW

    MaximumRatings | (NOMINAL) - - - - - - - 20 KW *Loaded Conditions

  • 000H3 is 7.5 volts. Filament voltage, as meas- cally, either base up or down

    0 volts

    | 000H3 is 7.5 volts. Filament voltage, as meas- cally, either base up or down.

  • from 7.5 volts by more than plus or minus five The anode of the 3CW20,000H3 is cooled by

    7.5 volts

    | from 7.5 volts by more than plus or minus five The anode of the 3CW20,000H3 is cooled by

  • The grid current rating is 0.6 ampere dc. This levels. The table is based upon a water tempera

    0.6 ampere

    | The grid current rating is 0.6 ampere dc. This levels. The table is based upon a water tempera-

  • value should not be exceeded for more than very ture rise of 20°C

    20 °C

    | value should not be exceeded for more than very ture rise of 20°C.

  • operate with more than 0.2 to 0.4 amp grid Dissipation Flow Drop

    0.2 amp

    | operate with more than 0.2 to 0.4 amp grid Dissipation Flow Drop

  • a dc current meter. The maximum grid dissipa- 15 3 3.0

    15 a

    | a dc current meter. The maximum grid dissipa- 15 3 3.0

  • tion rating is 250 watts

    250 watts

    | tion rating is 250 watts.

  • volts and maximum plate current of 4.0 amps Since power dissipated by the filament repre

    4 volts

    | volts and maximum plate current of 4.0 amps Since power dissipated by the filament repre-

  • should not be applied simultaneously as rated sents 750 watts and grid dissipation can reach

    750 watts

    | should not be applied simultaneously as rated sents 750 watts and grid dissipation can reach

  • plate dissipation may be exceeded. The 40 kilo- 250 watts, 1000 watts has been added to anode

    40 watts

    | plate dissipation may be exceeded. The 40 kilo- 250 watts, 1000 watts has been added to anode

  • Plate over-current protection should be pro- outlet-water temperature will be below 70°C to

    70 °C

    | Plate over-current protection should be pro- outlet-water temperature will be below 70°C to

  • tors should be used. These precautions are es- metal seal temperatures below the 250°C maxi

    250 °C

    | tors should be used. These precautions are es- metal seal temperatures below the 250°C maxi-

  • The 3CW20,000H3 is usable to 140 Mc. At here, write to Power Grid Tube Div., Eimac Di

    3 Mc

    | The 3CW20,000H3 is usable to 140 Mc. At here, write to Power Grid Tube Div., Eimac Di-

  • 7000 volts in Class C service. los, Calif. for information and recommendations

    7000 volts

    | 7000 volts in Class C service. los, Calif. for information and recommendations.

  • A | dO® . 4.250!

    4.25 A

    | A | dO® . 4.250!

  • FITTING NUTS. v -850

    -850 v

    | FITTING NUTS. v -850

  • [SEENOTE 3 ) w | 29° 3/°

    3 w

    | [SEENOTE 3 ) w | 29° 3/°

  • WATER F17TINGS A€E TO AE

    7 A

    | WATER F17TINGS A€E TO AE

Data set 02

1975 Eimac Tube Manual

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Amplification factor

    20

  • Heater/filament voltage

    7.5 V

  • Heater/filament current

    99 A

Other

  • Maximum plate voltage

    12000 V

  • Maximum plate dissipation

    20000 W

  • Maximum grid dissipation

    250 W

  • Maximum cathode/plate current

    4 A

  • Frequency for maximum ratings

    90 MHz

  • Plate input power maximum

    40000 W

    IndustrialRF

  • Typical plate output power

    28000 W

    ClassC

Capacitance

  • Input/grid-filament capacitance

    48 to 58 pF

  • Output/plate-filament capacitance

    1.2 to 1.5 pF

  • Feedback/grid-plate capacitance

    30 to 38 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

    20

  • Heater/filament voltage

    7.5 V

  • Heater/filament current

    99 A

Other

  • Maximum plate voltage

    12000 V

  • Maximum plate dissipation

    20000 W

  • Maximum grid dissipation

    250 W

  • Maximum cathode/plate current

    4 A

  • Frequency for maximum ratings

    90 MHz

  • Plate input power maximum

    40000 W

    IndustrialRF

  • Typical plate output power

    28000 W

    ClassC

Capacitance

  • Input/grid-filament capacitance

    48 to 58 pF

  • Output/plate-filament capacitance

    1.2 to 1.5 pF

  • Feedback/grid-plate capacitance

    30 to 38 pF

Construction

  • Cooling

    Water and forced air

Data set 04

199X Svetlana

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • (Frequencies to

    30 MHz

    Typical Operation (under load)

  • DC plate voltage 7,000

    10000 V

    Typical Operation (under load)

  • DC plate current 4.0

    4 A

    Typical Operation (under load)

  • DC grid voltage -670

    -800 V

    Typical Operation (under load)

  • DC grid current 275

    315 mA

    Typical Operation (under load)

  • Peak RF grid voltage 340

    340 V

    Typical Operation (under load)

  • Driving power 260

    350 W

    Typical Operation (under load)

  • Grid dissipation 78

    46 W

    Typical Operation (under load)

  • Plate input power 28,000

    40000 W

    Typical Operation (under load)

  • Plate dissipation 9,000

    12000 W

    Typical Operation (under load)

  • Plate output power 19,000

    28000 W

    Typical Operation (under load)

  • Approximate load impedance 720

    1270 Ohms

    Typical Operation (under load)

  • Voltage 7.5 ±

    0.37 V

    triode designed for use in oscillator, amplifier, or modulator service. The

  • Current @

    7.5 V

    triode designed for use in oscillator, amplifier, or modulator service. The

  • Amplification factor (average)

    20 V

    triode designed for use in oscillator, amplifier, or modulator service. The

  • Input

    53 pF

    triode designed for use in oscillator, amplifier, or modulator service. The

  • Output

    1.3 pF

    triode designed for use in oscillator, amplifier, or modulator service. The

  • Feedback

    34 pF

    triode designed for use in oscillator, amplifier, or modulator service. The

  • Maximum frequency for full ratings (CW)

    90 MHz

    triode designed for use in oscillator, amplifier, or modulator service. The

  • Plate dissipation

    20000 W

    Maximum Ratings

  • Grid dissipation

    250 W

    Maximum Ratings

  • DC grid voltage

    -1000 V

    Maximum Ratings

  • DC grid current

    600 mA

    Maximum Ratings

  • Plate input power

    40000 W

    Maximum Ratings

  • Huntsville, AL 35802 Portola Valley, CA

    94028 W

    Maximum Ratings