Data set 01
1942 Electrons Inc
Published operating points and test conditions from this source.
SECTION 1
Rectifier
Characteristics
Heating time
15 s
Published datasheet value
Other
Continuously recurring peak current
3 A
Oscillograph peak
Rectifier - Half Wave ·Rectifier
3B21
Directly heated gas-filled rectifier for industrial and high-current power supplies. Its gas-discharge construction and multiampere peak capability distinguish it from ordinary vacuum rectifiers.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- UX4
- Base pins
- -
- Nominal heater
- -
Description
The 3B21 is a gas-filled rectifier documented in the approved datasheet, with published filament and rectifier operating ratings.
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
- -
- Socket code
- UX4
- Base pins
- -
- Nominal heater voltage
- -
- Nominal heater current
- -
- 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
Rectifier
X-ray radiationInterelectrode capacitances
- Rectifier peak forward current
- 3 A
Published rectifier/control ratings promoted where applicable.
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.