Data set 01
2026 Western Electric 400s
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Typical power output
0.205 W
PlateVoltage=190V;GridVoltage=-14V
Voltage - Triode (single) ·Triode
440A
Western Electric filamentary triode for voice- and carrier-frequency low-power amplification, also suitable for oscillator, modulator, and demodulator service.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- UX4
- Base pins
- 4
- Nominal heater
- 4.5 V / 500 mA
Description
Western Electric 440A is a filamentary triode for voice- and carrier-frequency low-power amplification and also oscillator, modulator, or demodulator service.
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
- 500 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
Triode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 4900 Ω
- Transconductance
- 0.00133 S
- Amplification factor
- 6.5
- Max plate voltage
- 190 V
- Max cathode current
- 10.9 mA
Maximum plate-voltage digit in OCR is weak; 190 V is supported by highest published typical operating column and retained conservatively.
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.