Data set 01
1960 RCA Industrial and Communications Types
Published operating points and test conditions from this source.
SECTION 1
Thyratron
CrossReference
Prototype / equivalent family
2D21
Other
Military specification
MIL-E-1/756B
Specialized - Thyratron ·Thyratron
2D21W
Ruggedized xenon-filled four-electrode thyratron for switching, pulse modulation, relay, and grid-controlled rectifier service under shock and vibration.
Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
- Sections
- 1
- Base
- -
- Socket code
- IO
- Base pins
- 7
- Nominal heater
- 6.3 V / 600 mA
Description
The 2D21W is a ruggedized xenon-filled four-electrode thyratron with negative-control characteristics, designed for switching, pulse-modulator, relay and grid-controlled rectifier service and strengthened for shock and vibration.
Socket description
International Octal
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- IO
- Base pins
- 7
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 600 mA
- 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
Thyratron
X-ray radiationInterelectrode capacitances
- Max cathode current
- 100 mA
- Rectifier peak inverse voltage
- 1300 V
- Rectifier nominal output current
- 200 A
- Rectifier peak forward current
- 500 A
- Rectifier forward voltage drop
- 8 V
- Rectifier max heater-cathode voltage
- 100 V
- Rectifier warm-up time
- 10 s
Four-electrode thyratron; specialized firing and pulse ratings are preserved in parameters.
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 Tung Sol
Published operating points and test conditions from this source.
SECTION 1
Thyratron
Capacitance
AnodeToCathodeShieldCapacitance
2.4 pF
ControlGridToCathodeCapacitance
1.6 pF
Characteristic
AnodeControlDelay
35 us
PulseService
Anode Voltage Drop
8 V
Data set 03
1966 Tung Sol Electronic Tubes 3 of 4
Published operating points and test conditions from this source.
SECTION 1
Thyratron
Characteristic
Anode-to-control-grid capacitance
0.026 pF
WholeTube
Control-grid-to-cathode capacitance
2.4 pF
WholeTube
Anode-to-cathode capacitance
1.6 pF
WholeTube
Other
Minimum cathode heating time
10 s
Characteristic
De-ionization time
35 µs
GridVoltageMinus100V Anode125V AnodeCurrent0.1A
Ionization time
0.5 µs
Characteristic
Anode voltage drop
8 V
Characteristic
Peak inverse anode voltage
1300 V
RelayGridControlledRectifier
Peak forward anode voltage
650 V
RelayGridControlledRectifier
Peak cathode current
500 mA
RelayGridControlledRectifier
Average cathode current
200 mA
RelayGridControlledRectifier
Surge cathode current
10 A
RelayGridControlledRectifier
Maximum pulse time
5 µs
PulseModulator
Maximum frequency
500 pps
PulseModulator