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NL625

Directly heated National Electronics industrial rectifier for high-current supplies. Rated for approximately 900 V peak inverse voltage and 15 A nominal output for substantial industrial equipment.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 2.5 V / 20 A

Description

The NL625 is a National Electronics industrial rectifier tube with published DC output-current and peak-inverse-voltage ratings.

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: 2.5 V
Nominal heater current: 20 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

Rectifier

X-ray radiationInterelectrode capacitances

Max cathode current: 15 A
Rectifier peak inverse voltage: 900 V
Rectifier nominal output current: 15 A
Rectifier peak forward current: 45 A
Rectifier forward voltage drop: 10 V
Rectifier warm-up time: 120 s

Published rectifier ratings promoted from technical-information table.

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

Rectifier

Other

Maximum peak inverse voltage
900 V
Published datasheet value
Maximum DC output current
15 A
Published datasheet value
Maximum instantaneous output current
45 A
Published datasheet value
Maximum AC short-circuit current
750 A
Published datasheet value

Characteristics

Heating time
120 s
Published datasheet value
Typical arc drop
10 V
At stated peak current

Data set 02

1957 National Electronics

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

Maximum DC output current
15 A
Maximum instantaneous output current
45 A
Maximum peak inverse voltage
900 V

Characteristic

Filament heating time
120 s
Typical arc drop
10 V
Typical anode starting voltage
13 V

Construction

Filling
Mercury vapor

Application

Service
Industrial power rectifier