Data set 01
1958 Mullard Receiving Tubes
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristics
Plate voltage
100 V
Screen-grid voltage
100 V
Plate current
7 mA
Screen-grid current
2.4 mA
Voltage Pentode ·Pentode
EF74
Subminiature voltage-amplifying pentode specifically designed for low-microphony applications in sensitive professional equipment.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- B8D/F
- Socket code
- WIRE8
- Base pins
- 8
- Nominal heater
- 6.3 V / 200 mA
Description
Subminiature voltage-amplifying pentode designed for low-microphony applications. Published heater, characteristics, ratings and application information were read from the supplied Mullard sheet.
Socket description
Subminiature all-glass 8-wire lead family
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- B8D/F
- Socket code
- WIRE8
- Base pins
- 8
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 200 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
B8D/F - 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
Pentode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 200000 Ω
- Transconductance
- 0.0031 S
- Amplification factor
- 28
- Max plate voltage
- 175 V
- Max screen voltage
- 175 V
- Max plate dissipation
- 0.9 W
- Max screen dissipation
- 0.35 W
- Max cathode current
- 10 mA
Published characteristics and limiting values.
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.
Data set 02
1963 Mullard
Published operating points and test conditions from this source.
SECTION 1
Pentode
Capacitance
Input capacitance
3.6 pF
External shield
Output capacitance
4.2 pF
External shield
Characteristic
Anode current
7 mA
Va=100V; Vg2=100V