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Power - Triode ·Triode

3CX100A5

Ceramic-metal industrial power triode designed for high-power RF amplifier, oscillator, or modulator service. Manufacturer data emphasize transmitting duty, substantial plate dissipation, and the cooling provisions required for continuous professional operation.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
6 V / 1.05 A

Description

Rugged ceramic/metal planar triode for CW/pulsed oscillator, amplifier, frequency multiplier, pulse modulator or regulator service to 3 GHz.

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
6 V
Nominal heater current
1.05 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
Transconductance
0.025 S
Amplification factor
100
Max plate voltage
3500 V
Max plate dissipation
100 W
Max grid dissipation
2 W
Max cathode current
4.8 A

CW Class-C absolute maxima promoted; pulse-only plate-supply rating preserved separately as a parameter.

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

Characteristic

  • Heater Current

    900 mA to 1.05 A

Capacitance

  • Grid-Cathode Capacitance

    5.6 to 7 pF

  • Grid-Plate Capacitance

    1.95 to 2.15 pF

  • Plate-Cathode Capacitance Maximum

    0.035 pF

Other

  • Frequency for Maximum Ratings

    2.5 GHz

  • Pulse Plate Voltage Maximum

    3500 V

    PlatePulsed

  • Pulse Plate Current Maximum

    3 A

    PlatePulsed

  • Pulse Cathode Current Maximum

    4.8 A

    PulseModulator

  • Typical CW Useful Output

    40 W

    Frequency=500MHz

Data set 02

1965 Eimac Tube Manual

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Heater/filament voltage

    6 V

  • Heater/filament current

    1.05 A

  • Amplification factor

    100

  • Transconductance

    25000 uS

Capacitance

  • Input/grid-cathode capacitance

    5.6 pF

  • Output/plate-cathode capacitance

    7 pF

  • Feedback/grid-plate capacitance

    0.35 pF

Other

  • Maximum plate voltage

    3500 V

  • Maximum plate dissipation

    100 W

  • Maximum grid dissipation

    2 W

  • Maximum plate/cathode current

    4.8 A

  • Frequency for maximum ratings

    2500 MHz

  • CW plate voltage

    1000 V

    CW

  • Pulse peak plate voltage

    3500 V

    Pulse

  • Pulse cathode current

    4.8 A

    Pulse

  • Useful output at 500 MHz

    27 W

    500MHz

  • Useful output at 2900 MHz

    9.5 W

    2900MHz

Data set 03

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

  • Grid-to-plate capacitance

    2 pF

  • Grid-to-cathode capacitance

    6.3 pF

  • Plate-to-cathode capacitance maximum

    0.035 pF

Other

  • Cathode heating time minimum

    60 to - s

  • Maximum frequency, CW

    2500 MHz

    ClassC CW

  • Peak negative RF grid voltage

    400 V

    ClassC CW

  • DC grid current maximum

    50 mA

    ClassC CW

  • Plate-pulse supply voltage maximum

    3500 V

    PlatePulsed

  • Pulse duration maximum

    3 us

    PlatePulsed

  • Duty factor maximum

    0.0025

    PlatePulsed

  • Plate current during pulse

    3 A

    PlatePulsed

  • Typical plate voltage

    600 V

    AverageCharacteristics

  • RF power amplifier plate voltage

    900 V

    500MHz

  • RF power amplifier plate current

    90 mA

    500MHz

  • Useful power output

    17 W

    1000V operating example

Characteristic

  • Typical plate current

    70 mA

    AverageCharacteristics

Data set 04

1971 Machlette Laboratories

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Frequency for Maximum Ratings

    3000 MHz

Data set 05

1975 Eimac Tube Manual

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Heater Current Range

    900 mA to 1.05 A

  • Cathode Heating Time

    60 s

Capacitance

  • Input Capacitance

    6.3 pF

  • Output Capacitance

    0.035 pF

  • Grid-Plate Capacitance

    1.98 pF

Other

  • Frequency Maximum

    3 GHz

  • Pulse Plate Voltage Maximum

    3500 V

    PlatePulsed

  • Pulse Current Maximum

    4.8 A

    PulseModulator

  • Pulse Duration Maximum

    6 us

  • Duty Factor Maximum

    0.0033

  • Grid-Pulsed Plate Voltage Maximum

    1000 V

  • Plate-Pulsed Peak Plate Voltage Maximum

    3500 V

  • Pulse Plate Current Maximum

    3 A

  • Pulse Grid Current Maximum

    1.8 A

Data set 06

1976 Eimac Tube Manual

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Heater Current Range

    900 mA to 1.05 A

  • Cathode Heating Time

    60 s

Capacitance

  • Input Capacitance

    6.3 pF

  • Output Capacitance

    0.035 pF

  • Grid-Plate Capacitance

    1.98 pF

Other

  • Frequency Maximum

    3 GHz

  • Pulse Plate Voltage Maximum

    3500 V

    PlatePulsed

  • Pulse Current Maximum

    4.8 A

    PulseModulator

  • Pulse Duration Maximum

    6 us

  • Duty Factor Maximum

    0.0033

  • Grid-Pulsed Plate Voltage Maximum

    1000 V

  • Plate-Pulsed Peak Plate Voltage Maximum

    3500 V

  • Pulse Plate Current Maximum

    3 A

  • Pulse Grid Current Maximum

    1.8 A