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Specialized - Thyratron ·Thyratron

NL714

Quick-heating industrial gas-and-mercury thyratron designed especially for timing control and regulated-rectifier applications across wide temperature limits.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
DOWN
Socket code
UX4
Base pins
4
Nominal heater
2.5 V / 5.5 A

Description

NATIONAL POWER TUBE NL-714 is a quick heating industrial thyratron designed especially for tim- ing control and regulated rectifier applications. It is gas and mercury filled for quick starting and cons- tancy of characteristics within wide temperature limits. NL-715-5557 has the same general characteristics, within its narrower temperature limits, but is filled with mercury only to permit use of the tube at higher voltages such as are found in the amateur radio transmitter application. NAT

Socket description

Medium-shell UX 4-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
DOWN
Socket code
UX4
Base pins
4
Nominal heater voltage
2.5 V
Nominal heater current
5.5 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

Thyratron

X-ray radiationInterelectrode capacitances
Max plate voltage
1250 V
Max cathode current
1 A
Rectifier peak inverse voltage
1250 V
Rectifier nominal output current
1 A
Rectifier peak forward current
3 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

  • 1 Ampere do

    3 Amperes Peak A

    Source technical-information table; wording preserved from datasheet.

  • NL-714

    -- NL-715/5557 —~

    Source technical-information table; wording preserved from datasheet.

  • do Amperes output (maximum)

    I .0 | .25 | .5 | I .0 A

    Source technical-information table; wording preserved from datasheet.

  • Instantaneous Amperes output (maximum)

    3 | I | 2 | 3 A

    Source technical-information table; wording preserved from datasheet.

  • Maximum time of averaging anode current (seconds)

    5 | 5 | 5 | 5 A

    Source technical-information table; wording preserved from datasheet.

  • Maximum peak inverse volts

    1250 | 10,000 | 5,000 | 1250 V

    Source technical-information table; wording preserved from datasheet.

  • Maximum peak forward volts

    1250 | 5,000 | 2,500 | 1250 V

    Source technical-information table; wording preserved from datasheet.

  • Condensed mercury temperature

    limits ( | C) | -40--+80 | +40--+60 | +40--+80 | +40--+90 C

    Source technical-information table; wording preserved from datasheet.

  • Filament volts

    2.5 | 2.5 V

    Source technical-information table; wording preserved from datasheet.

  • Filament amperes

    5 ± .5 | 5 ± .5 A

    Source technical-information table; wording preserved from datasheet.

  • Heating time (seconds)

    5 | 5 s

    Source technical-information table; wording preserved from datasheet.

  • Maximum negative grid voltage before conduction (volts) . . . 500

    500 V

    Source technical-information table; wording preserved from datasheet.

  • Maximum negative grid voltage during conduction (volts)

    I0 | 10 V

    Source technical-information table; wording preserved from datasheet.

  • Maximum critical grid current (microamps)

    5 | 5 A

    Source technical-information table; wording preserved from datasheet.

  • Maximum ac short circuit current (amperes)

    50 | 50 A

    Source technical-information table; wording preserved from datasheet.

  • Approx. temp. rise, cond. mercury above ambient (nC)

    15 | 15

    Source technical-information table; wording preserved from datasheet.

  • Net weight (ounces)

    3 | 3 oz

    Source technical-information table; wording preserved from datasheet.

  • Approx. shipping weight (Ibs.)

    3 | 3 lb

    Source technical-information table; wording preserved from datasheet.

  • 14 -12 -IO

    -8 6 -4 -2

    Source technical-information table; wording preserved from datasheet.

Characteristic

  • Typical arc drop at 3 amperes peak (volts)

    15 | 15 V

    Source technical-information table; wording preserved from datasheet.

  • Ionization time (approx., microseconds)

    10 | 10 us

    Source technical-information table; wording preserved from datasheet.

  • Deionization time (approx., microseconds)

    1000 | 1000 us

    Source technical-information table; wording preserved from datasheet.

  • Anode to grid capacitance (uuf)

    2 | 2 pF

    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

Thyratron

Other

  • Maximum peak forward voltage

    1250 V

  • Maximum peak output current

    3 A

  • Maximum dc output current

    1 A