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NL5558

National Electronics indirectly heated mercury-filled industrial rectifier for substantial supplies. Its heavy heater and low arc voltage provide multiampere output with multi-kilovolt blocking capability.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: DOWN
Socket code: -
Base pins: 4
Nominal heater: 5 V / 4.5 A

Description

NATIONAL POWER TUBE NL-5558/FG-32 is a sturdy rectifier tube designed especially for Industrial power rectifier applications up to 1500 volts dc. It is mercury filled for efficiency, long life, and the ability to stand high inverse voltage. NATIONAL ELECTRONICS, INC. GENEVA, ILLINOIS, U. S. A. NL-5558/FG-32 RECTIFIER TUBE TECHNICAL INFORMATION w Indirectly heated Cathode do Amperes output (maximum) 2.5 2.5 Instantaneous Amperes output (maximum) 15 15 Maximum time of averaging anode current

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: DOWN
Socket code: -
Base pins: 4
Nominal heater voltage: 5 V
Nominal heater current: 4.5 A
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

DOWN - 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

Rectifier peak inverse voltage: 5000 V
Rectifier nominal output current: 2.5 A
Rectifier peak forward current: 15 A
Rectifier forward voltage drop: 12 V
Rectifier warm-up time: 300 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

Industrial power rectifier applications up to
1500 volts dc. It is mercury filled for efficiency,
Source technical-information table; wording preserved from datasheet.
do Amperes output (maximum)
2.5 | 2.5 A
Source technical-information table; wording preserved from datasheet.
Instantaneous Amperes output (maximum)
15 | 15 A
Source technical-information table; wording preserved from datasheet.
Maximum time of averaging anode current (seconds)
15 | 15 A
Source technical-information table; wording preserved from datasheet.
Maximum peak inverse volts
2000 | 5000 V
Source technical-information table; wording preserved from datasheet.
Heater volts
5 | 5 V
Source technical-information table; wording preserved from datasheet.
Heater amperes
45 ± | .4 4.5 ± | .4 A
Source technical-information table; wording preserved from datasheet.
Cathode heating time (minutes)
5 | 5 min
Source technical-information table; wording preserved from datasheet.
Maximum ac short circuit current (amperes)
200 | 200 A
Source technical-information table; wording preserved from datasheet.
Condensed mercury temperature lirnits (°C)
+ 35 to + 80 + 35 to + 60 C
Source technical-information table; wording preserved from datasheet.
Approximate temperature rise, cond. mercury above ambient (°C) . . . . 28
28 C
Source technical-information table; wording preserved from datasheet.
Net weight (ounces)
4 | 4 oz
Source technical-information table; wording preserved from datasheet.
Approx. shipping weight (Ibs.)
3 | 3 lb
Source technical-information table; wording preserved from datasheet.
CAP CI
5
Source technical-information table; wording preserved from datasheet.
7 'MAX
r | BA5E A4-IO
Source technical-information table; wording preserved from datasheet.

Characteristic

Typical arc drop at 10 amperes peak (volts)
12 | 12 V
Source technical-information table; wording preserved from datasheet.
Typical Anode starting voltage (volts)
50 | 50 V
Source technical-information table; wording preserved from datasheet.

Data set 02

1957 National Electronics

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

Maximum AC short-circuit current
200 A