Data set 01
1951 Mullard Valve and Service Manual
Published operating points and test conditions from this source.
SECTION 1
Triode
Characteristic
Heater Voltage
6.3 V
Heater Current
650 mA
Other
Plate Supply Voltage
250 V
RCAmplifier
Voltage - Triode (single) ·Triode
EC31
Low-impedance triode for voltage amplification or low-power output service; available source data do not establish the project’s 5-watt threshold.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- -
- Base pins
- -
- Nominal heater
- 6.3 V / 650 mA
Description
Low-impedance triode for voltage-amplifier or low-power output service.
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- -
- Base pins
- -
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 650 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
- 3300 Ω
- Transconductance
- 0.0032 S
- Amplification factor
- 10.5
- Max plate voltage
- 250 V
- Max plate dissipation
- 5 W
- Max cathode current
- 30 mA
Published Mullard ratings and characteristics promoted from the supplied source. Mullard EC31 low-impedance triode, used for voltage amplification or low-power Class A output. Maximum anode voltage 250 V, dissipation 5 W, cathode current 30 mA. Typical Class A output at Va 250 V and Vg -16 V: Ia 20 mA, gm 3.2 mA/V, amplification factor 10.5, plate resistance 3.3 kΩ.
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.