Data set 01
1961 Ferranti Technical Handbook
Published operating points and test conditions from this source.
SECTION 1
Triode
Characteristic
Heater Voltage
6.3 V
Heater Current
700 mA
SECTION 2
Pentode
Characteristic
Application
Audio output
Power - Pentode (NOT beam) ·Pentode-Triode
ECL83
Combination valve incorporating a power-output pentode with diode or triode sections for audio-frequency amplification, detection, or driver service.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- -
- Socket code
- B9A
- Base pins
- 9
- Nominal heater
- 6.3 V / 700 mA
Description
Combined triode and output pentode with separate cathodes for audio-frequency voltage amplification and power output.
Socket description
Small-button Noval 9-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- B9A
- Base pins
- 9
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 700 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
2 physical sections, each with unique specifications.
Section 1
Triode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 34000 Ω
- Transconductance
- 0.0025 S
- Amplification factor
- 85
- Max plate voltage
- 250 V
- Max plate dissipation
- 3.5 W
- Max cathode current
- 15 mA
Published Ferranti ratings and characteristics promoted from the supplied source.
Section 2
Pentode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 65000 Ω
- Transconductance
- 0.005 S
- Max plate voltage
- 250 V
- Max screen voltage
- 250 V
- Max plate dissipation
- 5.4 W
- Max screen dissipation
- 1.5 W
- Max cathode current
- 45 mA
Published Ferranti ratings and characteristics promoted from the supplied 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
1963 Mullard
Published operating points and test conditions from this source.
SECTION 1
Triode
Characteristics
Plate Voltage
200 V
Plate Current
2.4 mA
Grid Voltage
-1.5 V
Transconductance
2500 uS
Plate Resistance
34000 ohm
Amplification Factor
85 ratio
Plate-Grid Capacitance
1.6 pF
TriodeSection
Other
Voltage Gain
47 ratio
AFAmplifier; Vb=200V; Ra=100k
Maximum Output Voltage
17.7 Vrms
AFAmplifier; 5PercentDistortion
SECTION 2
Pentode
Characteristics
Plate Voltage
200 V
Screen Voltage
200 V
Plate Current
27 mA
Screen Current
4.4 mA
Grid Voltage
-13 V
Transconductance
5000 uS
Plate Resistance
65000 ohm
Input Capacitance
5.7 pF
PentodeSection
Output Capacitance
4.7 pF
PentodeSection
Other
Power Output
2.5 W
ClassA; OneTube; AudioAmplifier; Va=200V
Load Resistance
7500 ohm
ClassA; OneTube; Va=200V
Power Output
7.2 W
ClassAB; PushPull; TwoTubes; AudioAmplifier; Va=200V
Load Resistance Plate-to-Plate
7500 ohm
ClassAB; PushPull; TwoTubes; Va=200V
Data set 03
1967 Mullard Receiving Tubes for Maintenance
Published operating points and test conditions from this source.
SECTION 1
Triode
Characteristic
Plate voltage
200 V
Plate current
2.4 mA
Grid voltage
-1.5 V
Transconductance
2.5 mA/V
Plate resistance
34 kOhm
Amplification factor
85
Other
Maximum plate voltage
250 V
Maximum plate dissipation
3.5 W
Maximum cathode current
15 mA
Capacitance
Input capacitance
2.3 pF
Output capacitance
0.32 pF
Anode-grid capacitance
1.6 pF
SECTION 2
Pentode
Characteristic
Plate voltage
200 V
Screen-grid voltage
200 V
Plate current
27 mA
Screen-grid current
4.4 mA
Grid voltage
-13 V
Transconductance
5 mA/V
Plate resistance
65 kOhm
Other
Plate voltage
200 V
ClassA
Load resistance
7.5 kOhm
ClassA
Power output
2.5 W
ClassA
Power output
7.2 W
ClassAB PushPull TwoTubes
Maximum plate voltage
250 V
Maximum plate dissipation
5.4 W
Maximum screen-grid voltage
250 V
Maximum screen-grid dissipation
1.2 W
Maximum cathode current
45 mA
Capacitance
Input capacitance
5.7 pF
Output capacitance
4.7 pF