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PL255

Mercury-vapor thyratron triode for motor control, production machinery, elevator control, and resistance welding. Its heavy heater supports substantial current.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 5 V / 14 A

Description

Mercury-vapor thyratron triode for motor control, production machinery, elevator control, and resistance welding.

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: 5 V
Nominal heater current: 14 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

Thyratron

X-ray radiationInterelectrode capacitances

Max cathode current: 20 A

Promoted only where the locked schema has a direct semantic match; additional CRT, regulator, thyratron, pulse, capacitance, and operating values are retained 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

1963 Philips Electron Tubes Handbook V3

Published operating points and test conditions from this source.

SECTION 1

Thyratron

Characteristic

Arc voltage drop
10 V
Thyratron
Ionization time
10 µs
Thyratron
Deionization time
1000 µs
Thyratron

Other

Peak forward anode voltage maximum
1500 V
Thyratron
Peak inverse anode voltage maximum
2500 V
Thyratron
Peak cathode/anode current maximum
160 A
Thyratron
Average cathode/anode current maximum
20 A
Thyratron
Surge current maximum
1500 A
0.1Second

Construction

Gas/fill
Mercury vapor
Thyratron