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EL84

Power pentode designed for audio-frequency output amplification. Widely used in compact high-fidelity and receiver output stages, it provides substantial Class-A or push-pull audio power from miniature construction.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: B9A
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 760 mA

Description

Power pentode for AF output amplification. Indirectly heated Mazda/Belvu receiving tube; descriptive text translated to English from the French source.

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: B9A
Socket code: B9A
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 760 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

B9A - 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: 40000 Ω
Transconductance: 0.0113 S
Amplification factor: 19
Max plate voltage: 300 V
Max screen voltage: 300 V
Max plate dissipation: 12 W
Max screen dissipation: 2 W
Max cathode current: 65 mA

Output pentode with Class A1 amplifier operating data; printed 6BQ5 co-designation not expanded without explicit exact-equivalence statement.

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 01

1953 La Radiotechnique

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Heater voltage
6.3 V
Published nominal value
Heater current
760 mA
Published nominal value
Transconductance
11300 µS
Published typical/nominal value

Data set 02

1956 Amperex Hi Fi Brochure

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Plate Voltage
250 V
Screen Voltage
250 V
Plate Current
48 mA
Screen Current
5.5 mA
Control Grid Voltage
-7.3 V
Amplification Factor Grid1-to-Grid2
19 ratio

Other

Plate Load Resistance
5200 ohm
ClassA; OneTube

Data set 03

1958 Amperex Industrial

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
300 V
PushPull
Screen voltage
300 V
PushPull
Grid voltage
-14.5 V
PushPull
Plate current
46 mA
OneTube PushPull
Screen current
11 mA
OneTube PushPull

Characteristic

Transconductance
11300 µS

Data set 04

1958 Brimar Radio Valve No 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Heater Voltage
6.3 V
Heater Current
760 mA

Other

Plate Voltage
250 V
ClassA
Power Output
5.7 W
ClassA

Data set 05

195X Tesla

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Heater voltage
6.3 V
Published nominal value
Heater current
760 mA
Published nominal value

Data set 06

1961 Ferranti Technical Handbook

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Plate voltage
250 V
PentodeConnection
Screen-grid voltage
250 V
PentodeConnection
Control-grid voltage
-7.3 V
PentodeConnection
Plate current
48 mA
PentodeConnection
Screen-grid current
5.5 mA
PentodeConnection
Transconductance
11300 uS
PentodeConnection

Data set 07

1963 Amperex Condensed

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
250 V
AudioOutput
Screen voltage
250 V
AudioOutput
Control-grid voltage
-7.3 V
AudioOutput
Plate current
48 mA
AudioOutput
Screen current
5.5 mA
AudioOutput

Characteristic

Transconductance
11300 µS
Section1

Data set 08

1963 Mullard

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

Input capacitance
10.8 pF
Output capacitance
6.5 pF

Characteristic

Anode current
48 mA
Pentode; Va=250V
Screen current
5.5 mA
Pentode; Va=250V
Triode transconductance
10000 uS
TriodeConnection

Other

Output power
5.7 W
SingleValve; Pentode; 10% distortion

Data set 09

1963 Philips Electron Tubes Handbook V1a

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Heater voltage
6.3 V
Published heater rating
Heater current
760 mA
Published heater rating

Other

Plate voltage
250 V
ClassA
Screen voltage
250 V
ClassA
Grid bias
-7.3 V
ClassA
Plate current
48 mA
ClassA
Screen current
5.5 mA
ClassA

Data set 10

1967 Mullard Receiving Tubes for Maintenance

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Output pelltode rated for
12
Characteristic
Va
250 V
CHARACTERISTICS
Vg
34 V
CHARACTERISTICS
la
-9 V
CHARACTERISTICS
IR2
10 V
CHARACTERISTICS

Capacitance

Cout
6.5 pF
CAPACITANCES

Data set 11

1968 Mazda Belvu

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Tension filament ……s Vf
6.3 V
Couraiit filament … … If
760 mA
Capacité grille n° 1/ anode mruavese Cg,/ à
0.5 pF
Caâpacité grille n° 1/ ﬁlament......…...…................. Cg,/f
0.25 pF

Characteristic

Capacité d'entrée …….….....…..…..…ieriiecrermeesenssus Ce
10.8 pF
Capacité de sort1e - Cs
6.5 pF

Data set 12

1972 Philips Receiving Tubes

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Heater voltage
6.3 V
Published nominal value
Heater current
760 mA
Published nominal value
Transconductance
11300 µS
Published or referenced operating characteristic

Other

Maximum plate dissipation
12 W
Published or referenced maximum rating
Audio output power
6 W
Published quick-reference value

Data set 13

1973 Mazda Valves Binder 2

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Heater Voltage Vh
6.3 V
Heater Current Ih
760 mA
Maximum Anode Voltage Va(max)
300 V
Maximum Screen Voltage Vg2(max)
300 V
Maximum Anode Dissipation Pa(max)
12 W

Characteristic

Current Ik(av)max
65 mA

Data set 14

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Plate Voltage
330
Published value from supplied target entry
Grid-No
330 volts
Published value from supplied target entry
Grid-No
300
Published value from supplied target entry
Grid-No.l (Control-Grid) Voltage, Positive-bias value
0 volts
Published value from supplied target entry
Plate Dissipation
3.1 watts
Published value from supplied target entry
Grid-No
0.6 watt
Published value from supplied target entry

Data set 15

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Typical plate voltage
250 V
ClassA
Typical plate current
48 mA
ClassA
Typical screen current
5.5 mA
ClassA
Typical output power
5.7 W
ClassA

Data set 16

199X JJ

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Typical Plate Voltage
250 V
Typical Screen Voltage
250 V
TypicalControlGridVoltage
-7.3 V
Typical Plate Current
48 mA
Typical Screen Current
5.5 mA
Cathode Bias Resistance
135 ohm
ClassA1;OneTube
Load Resistance
5200 ohm
ClassA1;OneTube

Data set 17

2026 Genalex Rebrand

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Plate Current
40 to 54 mA
Plate 250 V; screen 250 V; grid -6.6 V

Other

Power Output
3 W
Plate 250 V; screen 250 V; load 5.2 kohm; ClassA;OneTube

Data set 18

2026 JJ Electronic

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Uf
6.3 V
Published value
If
760 mA
Published value
Ug2
300 V
Published value

Characteristics

Ua
250 V
Published value
Ug2
250 V
Published value
Ug1
-7.3 V
Published value
Ia
48 mA
Published value

Data set 19

2026 Mullard Rebrand

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Heater current
700 to 840 mA
Published min/max range

Data set 20

2026 Sovtek

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Plate Current
40 to 56 mA
Plate 250 V; Screen 250 V

Other

Power Output
4.2 W
Load 5.2 kohm; ClassA;OneTube

Data set 21

2026 Tungsol Rebrand

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Power Output
4.2 W
ClassA;OneTube;Plate 250 V;Screen 250 V;Load 5.2 kohm