Data set 01
1960 Mazda
Published operating points and test conditions from this source.
SECTION 1
Tetrode
Construction
Filling
Gas
Other
Maximum altitude
55000 ft
Specialized - Thyratron ·Tetrode
21A1
Gas-filled tetrode half-wave grid-controlled rectifier designed for high-altitude service. Grid triggering provides controlled gas conduction under reduced atmospheric pressure.
Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
- Sections
- 1
- Base
- -
- Socket code
- IO
- Base pins
- -
- Nominal heater
- 6.3 V / 950 mA
Description
Gas-filled tetrode half-wave grid-controlled rectifier for high-altitude service.
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
- -
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 950 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
Tetrode
X-ray radiationInterelectrode capacitances
- Max cathode current
- 250 mA
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
Tetrode
Characteristics
Maximum peak forward anode voltage
600 V
Maximum peak inverse anode voltage
1300 V
Maximum peak cathode current
1250 mA
Maximum shield-grid voltage
-100 V
Maximum control-grid voltage
-100 V
Maximum heater-cathode voltage
25 V
Data set 03
1961 Associated Electrical Industries
Published operating points and test conditions from this source.
SECTION 1
Tetrode
Characteristics
Maximum peak forward anode voltage
600 V
Maximum peak inverse anode voltage
1300 V
Maximum peak cathode current
1250 mA