Data set 01
2026 Western Electric 400s
Published operating points and test conditions from this source.
SECTION 1
Voltage Regulator
Characteristic
Regulation maximum
0.75 V
5to40mA
Starter breakdown voltage
125 V
Voltage Regulator ·VoltageRegulator
427A
Three-electrode inert-gas cold-cathode voltage regulator with starter electrode, maintaining approximately 100 V over a broad operating-current range.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- UX4
- Base pins
- 4
- Nominal heater
- -
Description
Western Electric 427A is a Three-electrode inert-gas-filled cold-cathode voltage regulator; third electrode is a starting element.
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
- -
- 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
Voltage Regulator
X-ray radiationInterelectrode capacitances
- Max cathode current
- 40 mA
- Regulator voltage
- 100 V
- Regulator minimum current
- 5 mA
- Regulator maximum current
- 40 mA
- Regulator starting voltage
- 165 V
- Regulator maintaining voltage
- 100 V
Regulator values promoted from published cathode-current and anode breakdown/voltage-drop data.
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.