Data set 01
193X Cunningham
Published operating points and test conditions from this source.
SECTION 1
Rectifier
Characteristics
Heater/filament voltage
7.5 V
Published nominal
Heater/filament current
1.25 A
Published nominal
Rectifier - Half Wave ·Rectifier
381
Early half-wave rectifier for receiving-equipment power supplies. Available manufacturer material confirms the rectifier role and conventional heater operation without supporting a narrower specialized function.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- UX4
- Base pins
- 4
- Nominal heater
- 7.5 V / 1.25 A
Description
The 381 is a rectifier described in the Cunningham Radio Tube Manual for detector, amplifier, oscillator, rectifier, or power-output service as applicable to the type.
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
- 4
- Nominal heater voltage
- 7.5 V
- Nominal heater current
- 1.25 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
Rectifier
X-ray radiationInterelectrode capacitances
No fixed ratings are recorded for this section.
Core published characteristics promoted conservatively from the approved manual sheet.
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.