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Specialized - Thyratron ·Triode

NL732

Metal-envelope gas-and-mercury thyratron for resistance welding and AC control. Its massive filament supports very heavy industrial switching.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
2.5 V / 55 A

Description

NATIONAL POWER TUBE NL-732 is a metal en- velope thyratron designed especially for resistance welding and AC control applications. It is gas and mercury filled for quick starting and long life with- out circuit cushioning. TECHNICAL INFORMATION do Amperes output (Maximum) 30 25 Instantaneous amperes output (Maximum) 160 225 Maximum time of averaging anode current (seconds) 30 Maximum peak inverse volts 1500 Maximum peak forward volts 1500 *Condensed mercury temperature limits

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
55 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

Triode

X-ray radiationInterelectrode capacitances
Max plate voltage
1500 V
Max cathode current
30 A
Rectifier peak inverse voltage
1500 V
Rectifier nominal output current
30 A
Rectifier peak forward current
225 A
Rectifier warm-up time
180 s

Published ratings and characteristics promoted where canonical fields apply.

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

Triode

Other

  • 30 Amperes do

    225 Ampere peak A

    Source technical-information table; wording preserved from datasheet.

  • do Amperes output (Maximum)

    30 | 25 A

    Source technical-information table; wording preserved from datasheet.

  • Instantaneous amperes output (Maximum)

    160 | 225 A

    Source technical-information table; wording preserved from datasheet.

  • Maximum time of averaging anode current (seconds)

    30 A

    Source technical-information table; wording preserved from datasheet.

  • Maximum peak inverse volts

    1500 V

    Source technical-information table; wording preserved from datasheet.

  • Maximum peak forward volts

    1500 V

    Source technical-information table; wording preserved from datasheet.

  • *Condensed mercury temperature limits (°C)

    —40 to +80 C

    Source technical-information table; wording preserved from datasheet.

  • Filament volts

    2.5 V

    Source technical-information table; wording preserved from datasheet.

  • Filament amperes

    55 ± 5 A

    Source technical-information table; wording preserved from datasheet.

  • Filament heating time (seconds)

    180 s

    Source technical-information table; wording preserved from datasheet.

  • Maximum negative grid voltage before conduction (volts)

    500 V

    Source technical-information table; wording preserved from datasheet.

  • Maximum negative grid voltage during conduction (volts)

    10 V

    Source technical-information table; wording preserved from datasheet.

  • Maximum critical grid current (microamps)

    10 A

    Source technical-information table; wording preserved from datasheet.

  • Max. do grid current (amperes)

    1 A

    Source technical-information table; wording preserved from datasheet.

  • Maximum ac short circuit current (amperes)

    2500 A

    Source technical-information table; wording preserved from datasheet.

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

    30

    Source technical-information table; wording preserved from datasheet.

  • Net weight (pounds)

    7 lb

    Source technical-information table; wording preserved from datasheet.

  • Approx. shipping weight (lbs.)

    15 lb

    Source technical-information table; wording preserved from datasheet.

  • *The tube may be started and satisfactory operation will result between —40 and

    +80°C. For maximum life the condensed

    Source technical-information table; wording preserved from datasheet.

  • mercury temperature after warm-up should run between

    +40 and +80°C which corresponds to approximately + IOand ±50°C C

    Source technical-information table; wording preserved from datasheet.

  • cs

    r00

    Source technical-information table; wording preserved from datasheet.

  • 19 8 11 MAX

    S00

    Source technical-information table; wording preserved from datasheet.

  • 20 -MI

    -12 -r -♦ O VS

    Source technical-information table; wording preserved from datasheet.

  • DC

    4010 VOLTAY[ AT 7TYTT OF DINCMADY[- VOLT

    Source technical-information table; wording preserved from datasheet.

  • FIN AT

    C)IARRLT(R17710 CAM

    Source technical-information table; wording preserved from datasheet.

  • FILAMENT

    FMABM/ Al 40000

    Source technical-information table; wording preserved from datasheet.

  • FILAMENT TERMINAL

    300

    Source technical-information table; wording preserved from datasheet.

  • NL-732 OUTLINE

    40 | 50 60 | 80 | 100

    Source technical-information table; wording preserved from datasheet.

  • PECENT DUTY

    2 TUBES CONNECTED IN INVERSE

    Source technical-information table; wording preserved from datasheet.

Characteristic

  • Typical arc drop at 100 amperes peak (volts)

    12 V

    Source technical-information table; wording preserved from datasheet.

  • Ionization time (approx., microseconds)

    10 us

    Source technical-information table; wording preserved from datasheet.

  • Deionization time (approx. microseconds)

    1000 us

    Source technical-information table; wording preserved from datasheet.

  • Anode to grid capacitance (uuf) (approx.)

    4 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

Triode

Other

  • Maximum peak forward voltage

    1500 V

  • Maximum peak output current

    225 A

  • Maximum dc output current

    30 A