F129B

Federal water-cooled power triode for RF amplification, oscillation, and Class B modulation. Approximately 7.5 kW plate dissipation and 12 kV capability provide substantial transmitter and modulator power with liquid cooling.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 18 V / 58 A

Description

Federal F-129-B water-cooled power triode for RF power-amplifier, oscillator and Class B modulator service; 7.5 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: 18 V
Nominal heater current: 58 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: 26
Max plate voltage: 12000 V
Max plate dissipation: 7500 W
Max grid dissipation: 1500 W
Max cathode current: 2.5 A

Highest applicable published maximum ratings promoted; service-specific operating points preserved as parameters.

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
26

Other

Maximum plate voltage
12000 V
Maximum plate dissipation
7500 W
Maximum cathode/plate current
2.5 A
Maximum frequency for full ratings
30 MHz
Typical RF plate voltage
10000 V
Typical RF output power
5.3 kW

Capacitance

Grid-plate capacitance
12 pF
Grid-filament capacitance
12.7 pF
Plate-filament capacitance
2.2 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

Other

FilamentStartingCurrent
115 A
Peak Cathode Current
9.5 A
AnodeCoolingMethod
Water
MaximumOperatingFrequency
30 MHz
Maximum Anode Dissipation
7500 W
Absolute maximum / applicable service

Capacitance

GridPlateCapacitance
12 pF
GridFilamentCapacitance
12.7 pF