Data set 01
1951 Mullard Valve and Service Manual
Published operating points and test conditions from this source.
SECTION 1
Triode
Characteristic
Heater Voltage
6.3 V
Heater Current
300 mA
Other
Plate Voltage
250 V
GroundedGrid
Voltage - Triode (single high frequency) ·Triode
EC91
Miniature screened grounded-grid triode for VHF/UHF amplifier service.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- B7G
- Base pins
- -
- Nominal heater
- 6.3 V / 300 mA
Description
Miniature screened grounded-grid triode for VHF/UHF amplifier service.
Socket description
Miniature 7-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- B7G
- Base pins
- -
- 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
Triode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 12000 Ω
- Transconductance
- 0.0085 S
- Amplification factor
- 100
- Max plate voltage
- 250 V
- Max plate dissipation
- 2.5 W
- Max cathode current
- 15 mA
Grounded-grid triode for ultra-short-wave service to about 250 MHz.
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
Triode
Characteristic
Heater Voltage
6.3 V
Heater Current
300 mA
Application
Grounded-grid UHF amplifier
Data set 03
1963 Mullard
Published operating points and test conditions from this source.
SECTION 1
Triode
Application
Application
UHF/VHF oscillator or amplifier
Other
Plate voltage
250 V
Plate current
10 mA
Transconductance
8.5 mA/V
Amplification factor
100
Plate resistance
12000 ohm
Equivalent noise resistance
400 ohm
Maximum operating frequency
250 MHz
Data set 04
1963 Philips Electron Tubes Handbook V1a
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Plate voltage
250 V
Grid voltage
-1.5 V
Plate current
10 mA
Maximum plate voltage
250 V
Maximum plate dissipation
2.5 W
Maximum useful frequency
250 MHz
Characteristic
Transconductance
8500 uS
Amplification factor
100
Capacitance
Grid capacitance
8.5 pF
Plate capacitance
- to 0.2 pF
Grid-plate capacitance
2.5 pF
Data set 05
1999 Philips E-Z
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Typical anode voltage
250 V
Characteristic
Anode-grid capacitance
0.2 pF
Maximum