Data set 01
1951 Mullard Valve and Service Manual
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristics
Cutoff characteristic
Variable-mu
Voltage Pentode - Remote Cutoff (single) ·Pentode
EF22
Variable-mu RF pentode for RF or IF voltage amplification in AC or AC/DC mains equipment. Its extended-control characteristic supports automatic gain regulation in transformerless receiver circuits.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- B8G
- Base pins
- 8
- Nominal heater
- 6.3 V / 200 mA
Description
Variable-mu RF pentode for RF or IF voltage amplification in AC or AC/DC mains equipment.
Socket description
Loctal 8-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- B8G
- Base pins
- 8
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 200 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
- 1200000 Ω
- Transconductance
- 0.0022 S
- Amplification factor
- 17
- Max plate voltage
- 300 V
- Max screen voltage
- 125 V
- Max plate dissipation
- 2 W
- Max screen dissipation
- 0.3 W
- Max cathode current
- 10 mA
Published maximum ratings/characteristics promoted from source.
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
195X Tesla
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
200 mA
Nominal
Maximum Plate Voltage
250 V
Maximum Screen Voltage
100 V
Maximum Plate Dissipation
3 W
Characteristic
Transconductance
2200 µS
Typical
Data set 03
1967 Mullard Receiving Tubes for Maintenance
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Plate voltage
250 V
RFOrIFAmplifier
Screen-grid voltage
100 V
RFOrIFAmplifier
Control-grid voltage
-2.5 V
RFOrIFAmplifier
Plate current
6 mA
RFOrIFAmplifier
Screen-grid current
1.7 mA
RFOrIFAmplifier
Transconductance
2.2 mA/V
RFOrIFAmplifier
Plate resistance
1.2 MOhm
RFOrIFAmplifier
Maximum plate voltage
300 V
Maximum plate dissipation
2 W
Maximum screen-grid voltage
125 V
Ia=6mA
Maximum screen-grid dissipation
0.3 W
Maximum cathode current
10 mA
Capacitance
Input capacitance
5.5 pF
Output capacitance
6.4 pF
Data set 04
1999 Philips E-Z
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristics
Heater voltage
6.3 V
Heater current
200 mA
Typical plate voltage
250 V
Uncontrolled
Typical screen voltage
100 V
Uncontrolled
Typical plate current
6 mA
Uncontrolled
Transconductance
2200 uS
Uncontrolled
Plate resistance
1.2 Mohm
Uncontrolled
Screen-grid amplification factor
17
Equivalent noise resistance
6200 ohm
Other
Maximum no-current plate voltage
550 V
Maximum plate voltage
300 V
Capacitance
Plate capacitance
6.1 pF
Grid input capacitance
5.5 pF
Plate-grid capacitance maximum
0.002 pF
Grid-heater capacitance maximum
0.004 pF