Data set 01
1951 Mullard Valve and Service Manual
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristics
Cutoff characteristic
Sharp cutoff
Application
Application
VHF amplification
Voltage Pentode - Sharp Cutoff (single) ·Pentode
EF54
Mullard short-wave sharp-cutoff RF pentode with high mutual conductance. Its substantial transconductance and fixed-control characteristic provide strong gain in short-wave high-frequency signal stages.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- B9G
- Base pins
- 9
- Nominal heater
- 6.3 V / 300 mA
Description
The Mullard EF54 is a short-wave sharp-cutoff RF pentode with high mutual conductance.
Socket description
Loctal 9-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- B9G
- Base pins
- 9
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 300 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
Pentode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 500000 Ω
- Transconductance
- 0.0077 S
- Max plate voltage
- 300 V
- Max screen voltage
- 300 V
- Max plate dissipation
- 3 W
- Max screen dissipation
- 1.7 W
Published source values promoted where applicable; additional published values retained as parameters.
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
Characteristics
Heater Voltage
6.3 V
Heater Current
300 mA
Plate Voltage
250 V
Screen Voltage
250 V
Plate Current
10 mA
Screen Current
1.45 mA
Transconductance
7700 uS
Plate Resistance
500000 ohm
Input Capacitance
6.2 pF
Output Capacitance
4.9 pF
Plate-Grid Capacitance
0.02 pF
Grid1-Grid2 Capacitance
2.2 pF
Equivalent Noise Resistance
700 ohm
Input Resistance
10000 ohm
50MHz
Other
Maximum Plate Voltage
300 V
Maximum Screen Voltage
300 V
Maximum Plate Dissipation
3 W
Maximum Screen Dissipation
1.7 W
Maximum Operating Frequency
250 MHz