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HK254

Medium-mu Gammatron power triode with a 100 W radiation-cooled tantalum plate for high-voltage RF service. Rated for approximately 4 kV plate operation, with long-life construction and unusually efficient VHF performance.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: GIANT2
Base pins: -
Nominal heater: 5 V / 7.5 A

Description

Medium-mu universal triode with a 100-watt radiation-cooled tantalum plate, high-voltage capability, long life, and unusual VHF efficiency. The source describes Gammatron construction using tantalum electrode structures and a thoriated-tungsten filament where applicable.

Socket description

Giant 2-contact transmitting-tube base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: GIANT2
Base pins: -
Nominal heater voltage: 5 V
Nominal heater current: 7.5 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: 25
Max plate voltage: 4000 V
Max plate dissipation: 100 W
Max cathode current: 225 mA

Published maximum ratings and characteristics promoted from the datasheet; typical application values remain parameter rows.

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

1944 Heintz and Kaufman

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Filament Voltage
5 V
Filament Current
7.5 A
Amplification Factor
25
Grid-Plate Capacitance
2.7 pF
InterelectrodeCapacitance
Grid-Filament Capacitance
2.5 pF
InterelectrodeCapacitance
Plate-Filament Capacitance
0.4 pF
InterelectrodeCapacitance

Other

Normal Plate Dissipation
100 W
Maximum Plate Voltage
4000 V
Maximum Average Plate Current
225 mA
Maximum Average Grid Current
60 mA
RF Class C Maximum Plate Voltage
4000 V
ClassC;Unmodulated
Normal Plate Dissipation
100 W