Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

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

F342A

Federal water-cooled high-power triode for RF amplification, oscillation, and Class B modulation. Approximately 25 kW plate dissipation and 20 kV capability support very substantial communications and broadcast transmitter power.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
20 V / 71 A

Description

Federal F-342-A water-cooled power triode for RF amplifier, oscillator and Class B modulator service; 25 kW anode dissipation.

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
20 V
Nominal heater current
71 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
40
Max plate voltage
20000 V
Max plate dissipation
25000 W
Max cathode current
13.5 A

Applicable promoted fields mapped from printed headings; specialized microwave/imaging/electrode data retained densely in TUBE_SECTION_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 ITT

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Filament Starting Current

    142 A

  • Filament Cold Resistance

    0.021 ohm

  • Peak Cathode Current

    13.5 A

  • Grid-Plate Capacitance

    25 pF

  • Grid-Filament Capacitance

    19 pF

  • Plate-Filament Capacitance

    2.5 pF

  • RF Frequency Full Rating Maximum

    4 MHz

  • RF Reduced Rating Frequency

    16 MHz

  • Typical AF Plate Voltage

    15000 V

  • RF Class C Plate Input Maximum

    50 kW

Data set 02

1962 ITT Industrial and Transmitting Tubes

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • FilamentStartingCurrent

    142 A

  • Peak Cathode Current

    13.5 A

  • AnodeCoolingMethod

    Water

  • MaximumOperatingFrequency

    4 MHz full rating; 16 MHz reduced rating

  • Maximum Anode Dissipation

    25000 W

    Absolute maximum / applicable service

Capacitance

  • PlateFilamentCapacitance

    2.5 pF