Data set 01
2026 Western Electric 400s
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Typical maximum signal power output
0.88 W
PlateVoltage=350V;GridVoltage=-22.5V
Power - Triode ·Triode
442A
Directly heated transmitting power triode intended for RF amplifier, oscillator, or modulator service. Manufacturer operating data emphasize radio-frequency power generation, substantial plate loading, and professional transmitter applications.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- UX4
- Base pins
- 4
- Nominal heater
- 4.5 V / 1.6 A
Description
Western Electric 442A is a filamentary triode designed for use as an audio-frequency power amplifier or modulator.
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
- 4.5 V
- Nominal heater current
- 1.6 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
Triode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 3700 Ω
- Transconductance
- 0.00195 S
- Amplification factor
- 7.2
- Max plate voltage
- 400 V
- Max plate dissipation
- 14 W
- Max cathode current
- 55 mA
Promoted from absolute maximum ratings and representative published typical characteristics.
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.