Data set 01
1951 Mullard Valve and Service Manual
Published operating points and test conditions from this source.
SECTION 1
Pentode
Application
Primary application
Audio-frequency voltage amplification
Construction
Low-microphony construction
Yes
Voltage Pentode ·Pentode
EF37
High-gain low-microphony pentode for RF, IF, and sensitive audio preamplifier stages, with very high plate resistance.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- IO
- Base pins
- 8
- Nominal heater
- 6.3 V / 200 mA
Description
The Mullard EF37 is a high-gain low-microphony pentode for RF, IF, and AF preamplifier stages.
Socket description
International Octal
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- IO
- 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
- 2500000 Ω
- Transconductance
- 0.0018 S
- Max plate voltage
- 300 V
- Max screen voltage
- 150 V
- Max plate dissipation
- 1 W
- Max screen dissipation
- 0.3 W
- Max cathode current
- 6 mA
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
Other
Plate Voltage
250 V
RForIFAmplifier
Screen Voltage
100 V
RForIFAmplifier
Plate Current
3 mA
RForIFAmplifier
Screen Current
0.8 mA
RForIFAmplifier
Grid Voltage
-2 V
Maximum Plate Voltage
300 V
Maximum Screen Voltage
125 V
Maximum Plate Dissipation
1 W
Maximum Screen Dissipation
0.3 W
Triode-Connected Plate Voltage
150 V
TriodeConnection
Characteristics
Transconductance
1800 uS
Plate Resistance
2500000 ohm
Plate-Grid Capacitance Maximum
0.02 pF
Input Capacitance
5.5 pF
Output Capacitance
8.5 pF
Triode-Connected Transconductance
2800 uS
TriodeConnection
Triode-Connected Plate Resistance
10000 ohm
TriodeConnection
Triode-Connected Amplification Factor
28 ratio
TriodeConnection