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
Voltage Pentode - High Frequency (single) ·Pentode
EF42
High-transconductance pentode for wideband and high-frequency voltage amplification, providing strong broadband gain and useful signal current.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- RIMLOCK
- Socket code
- B8A
- Base pins
- 8
- Nominal heater
- 6.3 V / 200 mA
Description
High-transconductance pentode for wideband and high-frequency voltage amplification.
Socket description
Rimlock 8-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- RIMLOCK
- Socket code
- B8A
- Base pins
- 8
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 200 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
RIMLOCK - 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
- 600000 Ω
- Transconductance
- 0.0095 S
- Max plate voltage
- 300 V
- Max screen voltage
- 300 V
- Max plate dissipation
- 2.5 W
- Max screen dissipation
- 0.8 W
- Max cathode current
- 30 mA
Published ratings/characteristics promoted from the approved 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
1953 La Radiotechnique
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
300 V
Maximum Screen Voltage
300 V
Maximum Plate Dissipation
2.5 W
Characteristic
Transconductance
9500 µS
Typical
Amplification Factor
5700
Typical
Plate Resistance
600000 ohm
Typical
Data set 03
1963 Philips Electron Tubes Handbook V1a
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristic
Heater voltage
6.3 V
Published heater rating
Heater current
330 mA
Published heater rating
Transconductance
9000 µS
RForIFAmplifier
Bandwidth
0.8 MHz
At 100 MHz
Other
Plate voltage
250 V
RForIFAmplifier
Screen voltage
250 V
RForIFAmplifier
Grid bias
-2 V
RForIFAmplifier
Plate current
10 mA
RForIFAmplifier
Screen current
2.4 mA
RForIFAmplifier
Data set 04
1968 Mazda Belvu
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
330 mA
Nominal
Maximum Plate Voltage
300 V
Maximum Screen Voltage
300 V
Maximum Plate Dissipation
2.5 W
Maximum Screen Dissipation
0.8 W
Maximum Cathode Current
30 mA
Characteristic
Transconductance
9500 µS
Typical
Amplification Factor
5700
Typical
Plate Resistance
600000 ohm
Typical
Data set 05
1999 Philips E-Z
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristics
Heater voltage
6.3 V
Heater current
330 mA
Typical plate voltage
250 V
Typical plate current
10 mA
Typical screen current
2.4 mA
Transconductance
9000 uS
Screen-grid amplification factor
83
Capacitance
Plate capacitance
4.3 pF
Grid input capacitance
8.5 pF
Plate-grid capacitance maximum
0.006 pF
Grid-heater capacitance maximum
0.2 pF