Data set 01
1931 Cunningham Radio Tubes
Published operating points and test conditions from this source.
SECTION 1
Triode
Characteristics
Filament/heater voltage
5 V
Filament/heater current
250 mA
Voltage - Triode (single) ·Triode
CX371A
Power triode for audio-output, amplifier, or oscillator service with manufacturer operating data supporting substantial power delivery.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- UX4
- Base pins
- 4
- Nominal heater
- 5 V / 250 mA
Description
CX371A: Cunningham power amplifier triode. The complete bulletin was read for construction, ratings, circuit recommendations, and operating characteristics.
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
- 5 V
- Nominal heater current
- 250 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
- 1960 Ω
- Transconductance
- 0.00152 S
- Amplification factor
- 3
- Max plate voltage
- 180 V
Cunningham CX-371A directly heated audio-output triode intended for final AF amplifier service, maximum plate voltage 180 V. Typical characteristics at 135 V and -27 V grid bias: amplification factor 3, transconductance 1520 µmhos, plate resistance 1960 ohms, plate current 17.5 mA. Undistorted power output depends on operating point and load.
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.