Data set 01
1960 Mazda
Published operating points and test conditions from this source.
SECTION 1
Triode
Construction
Filling
Mercury vapour
Other
Maximum surge cathode current
250 A
0.1 s
Maximum supply frequency
150 Hz
Specialized - Thyratron ·Triode
21N12
Mercury-vapor thyratron for power supplies and welding equipment. Grid-controlled mercury discharge provides low-drop switching of substantial industrial current.
Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
- Sections
- 1
- Base
- -
- Socket code
- -
- Base pins
- -
- Nominal heater
- 5 V / 5 A
Description
Mercury-vapour thyratron for power supplies and welding equipment.
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
- 5 V
- Nominal heater current
- 5 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 cathode current
- 3 A
- Rectifier peak inverse voltage
- 10000 V
- Rectifier forward voltage drop
- 18 V
REDO promoted-field audit
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 02
1961 AEI Industrial Valves
Published operating points and test conditions from this source.
SECTION 1
Triode
Characteristics
Maximum peak forward anode voltage
10 kV
Maximum peak inverse anode voltage
10 kV
Maximum surge peak inverse voltage
20 kV
Maximum peak cathode current
25 A
Maximum surge cathode current
250 A
Maximum anode voltage drop
18 V
Maximum supply frequency
150 Hz
Minimum preheat time
3 min
Ionisation time
10 us
Deionisation time
1000 us
Data set 03
1961 Associated Electrical Industries
Published operating points and test conditions from this source.
SECTION 1
Triode
Characteristics
Maximum peak forward anode voltage
10 kV
Maximum peak inverse anode voltage
10 kV
Maximum surge peak inverse voltage
20 kV
Maximum peak cathode current
25 A