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HK57

Radiation-cooled Gammatron beam pentode designed for exceptionally high-frequency operation, with very low feedback capacitance permitting operation without neutralization.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: 7
Nominal heater: 5 V / 5 A

Description

50-watt radiation-cooled beam pentode with exceptionally high-frequency performance, very low feedback capacitance, and operation without neutralization. The source describes Gammatron construction using tantalum electrode structures and a thoriated-tungsten filament where applicable.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: 7
Nominal heater voltage: 5 V
Nominal heater current: 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

Beam Power

X-ray radiationInterelectrode capacitances

Max plate voltage: 3000 V
Max screen voltage: 500 V
Max plate dissipation: 50 W
Max screen dissipation: 25 W
Max cathode current: 150 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

Beam Power

Characteristic

Filament Voltage
5 V
Filament Current
5 A
Plate-Grid Capacitance
0.05 pF
InterelectrodeCapacitance
Input Capacitance
7.29 pF
InterelectrodeCapacitance
Output Capacitance
3.13 pF
InterelectrodeCapacitance

Other

Normal Plate Dissipation
50 W
Maximum Plate Voltage
3000 V
Maximum Average Plate Current
150 mA
Maximum Screen Input
25 W
RF Class C Unmodulated Maximum Screen Current
20 mA
ClassC;Unmodulated
RF Class C Unmodulated Maximum Control Grid Current
15 mA
ClassC;Unmodulated
RF Class C Plate-Modulated Maximum Plate Voltage
3000 V
ClassC;PlateModulated
Typical RF Plate Voltage
3000;2000;1500 V
ClassC;Unmodulated