Data set 01
1951 Mullard Valve and Service Manual
Published operating points and test conditions from this source.
SECTION 2
Diode
Characteristic
Heater Voltage
6.3 V
Heater Current
300 mA
Voltage Radio Detector Converter ·Diode-Diode-Pentode
EBF80
Double-diode variable-mu pentode for RF/IF amplification, detection, and automatic-volume-control service. The pentode provides controlled gain while paired diodes handle detector and AVC rectification.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 3
- Base
- NOVAL
- Socket code
- B9A
- Base pins
- 9
- Nominal heater
- 6.3 V / 300 mA
Description
Dual-diode pentode for detection and RF or IF amplification; source also designates 6N8.
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
- NOVAL
- Socket code
- B9A
- Base pins
- 9
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 300 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
NOVAL - Terminal pinout
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
Section ratings
3 physical sections, each with unique specifications.
Section 1
Pentode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 1400000 Ω
- Transconductance
- 0.0022 S
- Amplification factor
- 18
- Max plate voltage
- 300 V
- Max screen voltage
- 250 V
- Max plate dissipation
- 2 W
- Max screen dissipation
- 0.3 W
- Max cathode current
- 10 mA
Published ratings/characteristics promoted where clearly stated; repeated identical sections compressed where applicable.
Section 2
Diode
X-ray radiationInterelectrode capacitances
- Max cathode current
- 0.8 mA
- Rectifier peak inverse voltage
- 350 V
- Rectifier nominal output current
- 0.8 mA
- Rectifier peak forward current
- 5 mA
- Rectifier max heater-cathode voltage
- 100 V
Source-published values promoted where directly stated; additional values retained in parameter table.
Section 3
Diode
X-ray radiationInterelectrode capacitances
- Max cathode current
- 0.8 mA
- Rectifier peak inverse voltage
- 350 V
- Rectifier nominal output current
- 0.8 mA
- Rectifier peak forward current
- 5 mA
- Rectifier max heater-cathode voltage
- 100 V
Source-published values promoted where directly stated; additional values retained in parameter table.
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 RFT Rundfunk Technik
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
300 mA
Nominal
Maximum Plate Voltage
300 V
Maximum Screen Voltage
300 V
Maximum Plate Dissipation
1.5 W
Maximum Screen Dissipation
0.3 W
SECTION 2
Diode
Characteristics
Heater voltage
6.3 V
Published nominal value
Heater current
300 mA
Published nominal value
Transconductance
2200 µS
Published operating characteristic
Other
Maximum plate dissipation
1.7 W
Published maximum rating
Data set 03
1958 Brimar Radio Valve No 7
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristic
Application
VariableMuPentode
SECTION 2
Diode
Characteristic
Heater Voltage
6.3 V
Heater Current
300 mA
Data set 04
1961 Ferranti Technical Handbook
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristics
Cutoff characteristic
Variable-mu
Application
Application
RF / IF / AF amplifier
SECTION 2
Diode
Application
Application
Detector / AVC
Data set 05
1963 Philips Electron Tubes Handbook V1a
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Plate voltage
250 V
RFIFAmplifier
Screen voltage
85 V
RFIFAmplifier
Control-grid voltage
-2 V
RFIFAmplifier
Plate current
5 mA
RFIFAmplifier
Screen current
1.75 mA
RFIFAmplifier
Characteristic
Transconductance
2200 µS
Section1
Plate resistance
1400000 Ω
Section1
Capacitance
Plate capacitance
5.2 pF
Section1
Grid capacitance
4.2 pF
Section1
Grid-to-plate capacitance maximum
0.0025 pF
Section1
SECTION 2
Diode
Capacitance
Diode capacitance
2.2 pF
Diode1
SECTION 3
Diode
Capacitance
Diode capacitance
2.35 pF
Diode2
Data set 06
1967 Mullard Receiving Tubes for Maintenance
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Vg2 max. (la =
5 mA
Published in approved EBF80.pdf target datasheet; Section1
Ik max
10 mA
Published in approved EBF80.pdf target datasheet; Section1
I' d max
0.8 mA
Published in approved EBF80.pdf target datasheet; Section1
iadlPk) max
5 mA
Published in approved EBF80.pdf target datasheet; Section1
input vo ltage , '.lIn, is not less t han
25 mV
Published in approved EBF80.pdf target datasheet; Section1
input vo ltage , '.lIn, is not less t han 25 mV for an ou tput o f
50 mW
Published in approved EBF80.pdf target datasheet; Section1
SECTION 2
Diode
Other
Vg2 max. (la =
5 mA
Published in approved EBF80.pdf target datasheet; Section2
Ik max
10 mA
Published in approved EBF80.pdf target datasheet; Section2
I' d max
0.8 mA
Published in approved EBF80.pdf target datasheet; Section2
iadlPk) max
5 mA
Published in approved EBF80.pdf target datasheet; Section2
input vo ltage , '.lIn, is not less t han
25 mV
Published in approved EBF80.pdf target datasheet; Section2
input vo ltage , '.lIn, is not less t han 25 mV for an ou tput o f
50 mW
Published in approved EBF80.pdf target datasheet; Section2
Data set 07
1968 Mazda Belvu
Published operating points and test conditions from this source.
SECTION 1
Pentode
Application
Application
RF_IF_Amplifier text
SECTION 2
Diode
Application
Application
Detector text
Data set 08
1972 Philips Receiving Tubes
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Anode current Ia
5 mA
Transconductance S
2.2 mA/V
Heater voltage Ve
6.3 V
Heater current If
300 mA
Anode voltage Vao max
- to 550 V
Maximum
Va max
- to 300 V
Maximum
Anode dissipation W, max
- to 1.5 W
Maximum
Grid No.2 voltage Vg20 max
- to 550 V
Maximum
at anode current I3 = max
- to 2.5 mA
Maximum
at anode current Ia =
- to 5 mA
Maximum
Grid No.2 dissipation Wgz max
- to 0.3 W
Maximum
Cathode current Ix max
- to 10 mA
Maximum
Grid resistor, automatic bias Rgl max
- to 3 MQ
Maximum
Grid resistor, grid current bias Rgl max
- to 22 MQ
Maximum
Cathode to heater voltage Vs max
- to 100 V
Maximum
input voltage is min. 25 mV for an output of
50 to - mW
Minimum
Capacitance
Anode to all except grid No.1 Ca(gl)
4.9 pF
Grid No.1 to all except anode Cgl(a)
4.2 pF
Anode to grid No.l Cagl max
- to 0.0025 pF
Maximum
Grid No.1 to heater Cglf max
- to 0.07 pF
Maximum
Diode No.1 to grid No.1 Cd1g1 max
- to 0.0008 pF
Maximum
Diode No.2 to grid No.1 Cdzdl max
- to 0.001 pF
Maximum
Diode No.l to anode Cd;a max
- to 0.2 pF
Maximum
Diode No.2 to anode Cdza max
- to 0.05 pF
Maximum
Characteristic
Supply voltage Vb
250 A
Grid No.3 voltage Vg3
0 v
Grid No.2 resistor Rg2
95 k2
Grid No.l voltage Vg -2
-41.5 V
Internal resistance Ry 1.4 min
10 to - MQ
Minimum
Supply voltage Vb 250 250 250
250 V
Grid No.2 resistor Rg2 0.82 0.39 1.0
0.47 MQ
Grid No.l resistor Rgl 1 1 10
10 MQ
Grid No.1 resistor next stage Rg' 0.68 0.33 0.68
0.33 MQ
Anode current Ia 0.75 1.5 0.75
1.5 mA
Grid No.2 current Ig2 0.30 0.53 0.25
0.5 mA
at output voltage Vo =
3 VRMS
at output voltage Vo =
5 VRMs
Supply voltage Vb 250 250 250
250 V
Anode resistor R, 0.1 0.047 0.1
0.047 MQ
Grid No.1 resistor Rgl 1 1 10
10 MQ
Grid No.l resistor next stage Rg! 0.33 0.15 0.33
0.15 MQ
Anode current I, 2.08 4.10 2.16
4.5 mA
at output voltage V, =
3 VRMS
at output voltage Vo =
5 VRMS
at output voltage V, =
8 VRMS
SECTION 2
Diode
Capacitance
Diode No.!l to all Cdl
2.2 pF
Diode No.2 to all Cd2
2.35 pF
Diode No.1 to diode No.2 CdldZ max
- to 0.35 pF
Maximum
Diode No.l to heater Cdlf max
- to 0.02 pF
Maximum
Diode No.?2 to heater Cd2f max
- to 0.005 pF
Maximum
Other
Diode No.l voltage, negative peak -Vdp max
- to 350 V
Maximum
Diode No.2 voltage, negative peak —Vdp max
- to 350 V
Maximum
Diode No.l current Id1 max
- to 0.8 mA
Maximum
Diode No.2 current Id2 max
- to 0.8 mA
Maximum
Diode No.l current, peak Idlp max
- to 5 mA
Maximum
Diode No.2 current, peak IdZp max
- to 5 mA
Maximum
Cathode to heater voltage Vkf max
- to 100 V
Maximum
Data set 09
1973 Mazda Valves Binder 2
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
300 mA
Nominal
Maximum Plate Voltage
300 V
Maximum Screen Voltage
300 V
Maximum Plate Dissipation
1.5 W
Maximum Screen Dissipation
0.3 W
Maximum Cathode Current
10 mA
Characteristic
Transconductance
2200 µS
Typical
Amplification Factor
18
Typical
Plate Resistance
1500000 ohm
Typical
SECTION 2
Diode
Other
HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
300 mA
Nominal
Maximum Cathode Current
0.8 mA
SECTION 3
Diode
Other
HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
300 mA
Nominal
Maximum Cathode Current
0.8 mA
Data set 10
1999 Philips E-Z
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristics
Heater voltage
6.3 V
Heater current
300 mA
Typical plate voltage
250 V
Transconductance
2200 uS
Plate resistance
1.4 Mohm
Other
Maximum plate voltage
300 V
Maximum plate dissipation
1.5 W
Capacitance
Plate output capacitance
4.9 pF
Grid input capacitance
4.2 pF
Plate-grid capacitance maximum
0.0025 pF
SECTION 2
Diode
Other
Maximum diode current
0.8 mA
Maximum diode peak current
5 mA