Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Rectifier - Half Wave ·Rectifier

NL618P

Directly heated NL618-series industrial power rectifier. Rated for approximately 900 V peak inverse voltage, 6.4 A DC output, and 40 A peak current with a characteristic low conducting drop.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
4
Nominal heater
2.5 V / 18 A

Description

The NL618P 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
4
Nominal heater voltage
2.5 V
Nominal heater current
18 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
6.4 A
Rectifier peak inverse voltage
900 V
Rectifier nominal output current
6.4 A
Rectifier peak forward current
40 A
Rectifier forward voltage drop
9 V
Rectifier warm-up time
60 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

    6.4 A

    Published datasheet value

  • Maximum instantaneous output current

    40 A

    Published datasheet value

  • Maximum AC short-circuit current

    770 A

    Published datasheet value

Characteristics

  • Heating time

    60 s

    Published datasheet value

  • Typical arc drop

    9 V

    At stated peak current