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

F880

High-power water-cooled triode for RF amplification, oscillation, and Class B modulation. Approximately 20 kW plate dissipation and 10.5 kV capability support substantial transmitter power, with reduced-rating operation extending into VHF.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
12.6 V / 320 A

Description

Three-electrode high-power tube for radio-frequency amplifier, oscillator, or Class B modulator service. The water-cooled anode dissipates 20 kW, with reduced-rating operation specified to 100 MHz.

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
12.6 V
Nominal heater current
320 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
10500 V
Max plate dissipation
20000 W
Max cathode current
6 A

Cooling: Water and Forced Air

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 ITT

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Amplification factor

    20

Other

  • Maximum plate voltage

    10500 V

  • Maximum plate dissipation

    20000 W

  • Peak cathode current

    6 A

  • Maximum/full-ratings frequency

    25 MHz

Capacitance

  • Grid-plate capacitance

    24 pF

  • Grid-filament capacitance

    35 pF

  • Plate-filament capacitance

    2 pF

Construction

  • Cooling method

    Water

Data set 02

1962 ITT Industrial and Transmitting Tubes

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

  • GridPlateCapacitance

    24 pF

  • GridFilamentCapacitance

    35 pF

  • PlateFilamentCapacitance

    2 pF

  • FilamentStartingCurrent

    480 A

  • FilamentColdResistance

    0.003 ohm

Other

  • Maximum DC Grid Voltage

    -1600 V

    ClassC

  • Maximum DC Plate Current

    6 A

    ClassC

  • Maximum DC Grid Current

    1 A

    ClassC

  • Maximum Plate Input

    67.5 kW

    ClassC

  • Typical Power Output

    40 kW

    ClassC