HL25

High-voltage control triode for voltage-regulator service in high-voltage, low-current DC power supplies.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: IO
Base pins: -
Nominal heater: 4 V / 1 A

Description

High-voltage control triode for voltage-regulator service in high-voltage low-current DC supplies.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: IO
Base pins: -
Nominal heater voltage: 4 V
Nominal heater current: 1 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: 800
Max plate voltage: 15000 V
Max plate dissipation: 4 W
Max cathode current: 10 mA

Published Ferranti ratings and characteristics promoted where applicable; additional electrical, pulse, regulator, microwave, and operating data retained 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

1963 Ferranti

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Mean anode current maximum
10 mA
Peak anode current maximum
5 mA
Negative grid voltage maximum
-150 V
Grid circuit resistance maximum
5 Mohm
Peak heater-cathode voltage maximum
150 V
Cathode heating time minimum
45 s

Characteristics

Cutoff grid voltage at 15 kV
-32 V
Grid voltage for 5 uA at 15 kV
-25 V

Capacitance

Anode-cathode capacitance maximum
0.1 pF

Application

Application
High-voltage regulator control valve