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Power - Pentode (NOT beam) ·Pentode

EL34

Classic high-power EL34 output pentode for substantial single-ended and push-pull audio amplification.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
Octal
Socket code
IO
Base pins
8
Nominal heater
6.3 V / 1.5 A

Description

Glass octal types used in the output stage of audio- frequency amplifiers. Maximum dimensions: over-all length, 4%c inches; seated height, 3% inches; diameter, 1% inches. Tube requires octal socket. 8ET

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
Octal
Socket code
IO
Base pins
8
Nominal heater voltage
6.3 V
Nominal heater current
1.5 A
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

Octal - 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
15000 Ω
Transconductance
0.011 S
Amplification factor
11
Max plate voltage
800 V
Max screen voltage
500 V
Max plate dissipation
25 W
Max screen dissipation
8 W
Max cathode current
150 mA

Promoted ratings and characteristics are taken from the printed target-tube entry in the approved PDF.

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

Other

  • HeaterVoltageNominal

    6.3 V

    Nominal

  • HeaterCurrentNominal

    1.5 A

    Nominal

  • Maximum Plate Voltage

    800 V

  • Maximum Screen Voltage

    500 V

  • Maximum Plate Dissipation

    25 W

Characteristic

  • Transconductance

    11000 µS

    Typical

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

    100 mA

  • Screen Current

    14.9 mA

  • Control Grid Voltage

    -13.5 V

  • Amplification Factor Grid1-to-Grid2

    11 ratio

Data set 03

1958 Amperex Industrial

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate voltage

    800 V

    PushPull

  • Screen voltage

    400 V

    PushPull

  • Grid voltage

    -39 V

    PushPull

  • Plate current

    91 mA

    OneTube PushPull

  • Screen current

    19 mA

    OneTube PushPull

Characteristic

  • Transconductance

    11300 µS

Data set 04

1959 Telefunken

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Plate voltage

    250 V

  • Screen-grid voltage

    265 V

  • Plate current

    100 mA

  • Screen-grid current

    14.9 mA

Other

  • Plate voltage

    250 V

    ClassA;SingleEnded

  • Screen-grid voltage

    265 V

    ClassA;SingleEnded

Data set 05

195X Tesla

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • HeaterVoltageNominal

    6.3 V

    Nominal

  • HeaterCurrentNominal

    1.5 A

    Nominal

  • Maximum Plate Voltage

    800 V

  • Maximum Screen Voltage

    500 V

  • Maximum Plate Dissipation

    25 W

Characteristic

  • Transconductance

    11000 µS

    Typical

Data set 06

1963 Amperex Condensed

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate voltage

    800 V

    AudioOutput;PushPull;TwoTubes

  • Screen voltage

    400 V

    AudioOutput;PushPull;TwoTubes

  • Control-grid voltage

    -39 V

    AudioOutput;PushPull;TwoTubes

  • Plate current per pair

    182 mA

    AudioOutput;PushPull;TwoTubes

  • Screen current per pair

    38 mA

    AudioOutput;PushPull;TwoTubes

Characteristic

  • Transconductance

    11300 µS

    Section1

Data set 07

1963 Mullard

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • Anode current

    100 mA

    Pentode; Va=250V

  • Screen current

    15 mA

    Pentode; Va=250V

  • Triode transconductance

    11500 uS

    TriodeConnection

  • Triode plate resistance

    910 ohm

    TriodeConnection

  • Triode amplification factor

    10.5

    TriodeConnection

Data set 08

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

    1.5 A

    Published heater rating

Other

  • Plate voltage

    250 V

    ClassA

  • Screen voltage

    250 V

    ClassA

  • Grid bias

    -14.5 V

    ClassA

  • Plate current

    70 mA

    ClassA

Data set 09

1967 Mullard Receiving Tubes for Maintenance

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • Plate voltage

    250 V

    PentodeConnection

  • Screen-grid voltage

    250 V

    PentodeConnection

  • Plate current

    100 mA

    PentodeConnection

  • Screen-grid current

    15 mA

    PentodeConnection

  • Control-grid voltage

    -12.2 V

    PentodeConnection

  • Transconductance

    11 mA/V

    PentodeConnection

Data set 10

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

    1.5 A

    Published nominal value

  • Transconductance

    12500 µS

    Published or referenced operating characteristic

  • Transconductance

    12.5 mA/V

    Published quick-reference value

Other

  • Maximum plate dissipation

    25 W

    Published or referenced maximum rating

  • Audio output power

    100 W

    ClassB, published quick-reference value

Data set 11

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • Zero-Signal Grid-No

    4 mA

    Published value from supplied target entry

  • Plate Resistance (Approx.)

    15000 ohms

    Published value from supplied target entry

  • Transconductance

    9200

    Published value from supplied target entry

  • Load Resistance

    4500 ohms

    Published value from supplied target entry

  • Total Harmonic Distortion

    6 per cent

    Published value from supplied target entry

Other

  • Maximum-Signal Grid-No

    11 mA

    Published value from supplied target entry

Data set 12

1981 Russian Tubes Katsnelson and Larionov

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • Heater voltage

    6.3 V

    Published nominal/basic-parameter heater condition.

  • Heater current

    1500 mA

    Published heater current.

  • Plate current

    100 mA

    Published basic-parameter operating point.

  • Screen current

    14.9 mA

    Published basic-parameter operating point.

  • Transconductance

    11000 µS

    Published basic-parameter value; normalized to µS.

Other

  • Maximum plate voltage

    800 V

    Published limiting operating value.

  • Maximum screen voltage

    425 V

    Published limiting operating value.

Data set 13

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • Anode current I,

    100 mA

  • Transconductance S

    12.5 mA

Other

  • Output power, class B

    100 W

    ClassB

  • Heater voltage Vs

    6.3 V

    ClassB

Capacitance

  • Anode to all except grid No.1

    8.4 pF

  • Grid No.l to all except anode

    15.2 pF

Data set 14

199X JJ

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Typical Plate Voltage

    250 V

  • Typical Screen Voltage

    265 V

  • TypicalControlGridVoltage

    -10 V

  • Typical Plate Current

    100 mA

  • Typical Screen Current

    14.9 mA

Characteristic

  • GridCapacitance

    15.5 pF

  • Plate Capacitance

    10 pF

Data set 15

199X Svetlana

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • Voltage (AC or DC) 5.7 6.3

    6.9 V

    SourcePage1-2

  • Current

    1.6 A

    SourcePage1-2

  • Cathode-to-heater potential, max.

    100 V

    SourcePage1-2

  • base sleeve and heater <

    16 pF

    SourcePage1-2

  • base sleeve and heater <

    0.6 pF

    SourcePage1-2

  • Grid no.1 to plate <

    1.1 pF

    SourcePage1-2

Other

  • DC plate voltage

    800 V

    SourcePage1-2

Data set 16

2026 JJ Electronic

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Uf

    6.3 V

    Published value

  • If

    1.5 A

    Published value

Characteristics

  • Ua

    250 V

    Published value

  • Ug3

    0 V

    Published value

  • Ug2

    265 V

    Published value

Capacitance

  • Ia

    100 mA

    Published value

  • Ig2

    14.9 mA

    Published value

Data set 17

2026 Mullard Rebrand

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Heater current

    1.35 A to 1.65 A

    Published min/max range