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NL323B

National Electronics thyratron for control, timing, ignitor-firing, and related industrial switching service, with published peak-voltage and current ratings.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: -
Base pins: 4
Nominal heater: 2.5 V / 7 A

Description

The NL323B is a National Electronics thyratron intended for control, timing, ignitor-firing, or related industrial switching service, with published peak-voltage and current ratings.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: 4
Nominal heater voltage: 2.5 V
Nominal heater current: 7 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 plate voltage: 1250 V
Max cathode current: 1.5 A

Gas/mercury-filled grid-controlled rectifier (thyratron).

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

1956 National Electronics Industrial Tubes

Published operating points and test conditions from this source.

SECTION 1

Thyratron

Other

Maximum peak inverse voltage
1250 V
Published datasheet value
Maximum peak forward voltage
1250 V
Published datasheet value
Maximum DC output current
1.5 A
Published datasheet value
Maximum instantaneous output current
6 A
Published datasheet value
Maximum AC short-circuit current
120 A
Published datasheet value

Characteristics

Heating time
15 s
Published datasheet value
Typical arc drop
15 V
At stated peak current
Ionization time
10 us
Approximate
Deionization time
1000 us
Approximate
Anode-grid capacitance
2 pF
Published capacitance

Data set 02

1957 National Electronics

Published operating points and test conditions from this source.

SECTION 1

Thyratron

Other

Maximum DC output current
1.5 A
Maximum instantaneous output current
6 A
Maximum peak inverse voltage
1250 V
Maximum peak forward voltage
1250 V
Maximum negative grid voltage before conduction
500 V
Maximum negative grid voltage during conduction
10 V

Characteristic

Filament heating time
15 s
Typical arc drop
15 V
Deionization time
1000 us

Construction

Filling
Mercury vapor

Application

Service
Industrial grid-controlled rectifier

Capacitance

Anode-grid capacitance
2 pF