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
Voltage Pentode ·Pentode
EF36
High-impedance audio pentode for general voltage amplification and phase-inverter service, providing substantial gain for vintage audio amplifier circuitry.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- IO
- Base pins
- 8
- Nominal heater
- 6.3 V / 200 mA
Description
High-impedance AF pentode for general-purpose voltage amplification and phase-inverter service; supplied sheet refers ratings and characteristics to EF37A Issue 3.
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 ratings and characteristics promoted from the supplied Brimar 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
1958 Mullard Receiving Tubes
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristic
Heater Voltage
6.3 V
Heater Current
200 mA
Data set 03
1963 Mullard
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristics
Plate Voltage
250 V
Screen Voltage
100 V
Plate Current
3 mA
Screen Current
0.8 mA
Grid Voltage
-2 V
Transconductance
1800 uS
Plate Resistance
2500000 ohm
Plate-Grid Capacitance Maximum
0.02 pF
Input Capacitance
5.5 pF
Output Capacitance
8.5 pF
Other
Maximum Plate Supply Voltage
550 V
Maximum Plate Voltage
300 V
Maximum Plate Dissipation
1 W
Maximum Screen Voltage
200 V
Maximum Screen Dissipation
0.3 W
Data set 04
1967 Mullard Receiving Tubes for Maintenance
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Cross-reference type
EF37A
Ratings characteristics and operating conditions
Application
Intended service
AF voltage amplifier
Intended service
Phase inverter