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Power - TV Horizontal Output (sweep) ·Pentode

EL81

Output pentode designed for television line time-base service and also usable as a series-regulator valve in stabilized power supplies.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
B9A
Socket code
B9A
Base pins
9
Nominal heater
6.3 V / 1.05 A

Description

OUTPUT PENTODE Output pentode suitoble for use in the line time base of tele- vision receivers or as a series regulator valve in stabilised EL81 power supply units. HE ATER Vh 6.3 V Ih 1.05 A

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
1.05 A
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
15000 Ω
Transconductance
0.011 S
Max plate voltage
300 V
Max screen voltage
250 V
Max plate dissipation
8 W
Max screen dissipation
4.5 W
Max cathode current
180 mA

Published maximum ratings/characteristics promoted from 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 01

1953 La Radiotechnique

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • HeaterVoltageNominal

    6.3 V

    Nominal

  • HeaterCurrentNominal

    1.05 A

    Nominal

  • Maximum Plate Voltage

    300 V

  • Maximum Screen Voltage

    300 V

  • Maximum Plate Dissipation

    8 W

Characteristic

  • Transconductance

    6200 µS

    Typical

  • Amplification Factor

    69

    Typical

  • Plate Resistance

    15000 ohm

    Typical

Data set 02

195X Tesla

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • HeaterVoltageNominal

    6.3 V

    Nominal

  • HeaterCurrentNominal

    900 mA

    Nominal

  • Maximum Plate Voltage

    700 V

  • Maximum Screen Voltage

    250 V

  • Maximum Plate Dissipation

    8 W

Characteristic

  • Transconductance

    11000 µS

    Typical

Data set 03

1961 Ferranti Technical Handbook

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • Heater Voltage

    6.3 V

  • Heater Current

    1.05 A

  • Application

    Television line time-base output

Data set 04

1963 Mullard

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • Anode current

    32 mA

    Pentode

  • Screen current

    2.4 mA

    Pentode

  • Triode transconductance

    5500 uS

    TriodeConnection

  • Triode plate resistance

    1000 ohm

    TriodeConnection

  • Triode amplification factor

    5.5

    TriodeConnection

Other

  • Peak anode voltage

    7 kV

    Pulse limited

Data set 05

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

    800 mA

    Published heater rating

  • Transconductance

    4600 µS

    CharacteristicPoint

  • Plate resistance

    15000 ohm

    CharacteristicPoint

Other

  • Plate voltage

    250 V

    CharacteristicPoint

  • Screen voltage

    250 V

    CharacteristicPoint

  • Grid bias

    -38.5 V

    CharacteristicPoint

  • Plate current

    32 mA

    CharacteristicPoint

  • Screen current

    2.4 mA

    CharacteristicPoint

  • Maximum plate voltage

    300 V

    Published limit

  • Maximum plate dissipation

    8 W

    Published limit

  • Maximum screen voltage

    300 V

    Published limit

  • Maximum screen dissipation

    4.5 W

    Published limit

Data set 06

1967 Mullard Receiving Tubes for Maintenance

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

  • Cout

    11.4 pF

    CAPACITANCES (measur ed wit hout exte rnal shie ld)

Characteristic

  • Vg3

    0 V

    CHARACTERISTICS

  • Vg I

    5 V

    CHARACTERISTICS

  • gm

    4.6 mA

    CHARACTERISTICS

  • Vg1

    38 V

    CHARACTERISTICS

  • gm

    5.5 mA

    CHARACTERISTICS

Other

  • Va(b) max

    550 V

    LIMITING VALUES

  • Va max

    300 V

    LIMITING VALUES

  • *valPk) max

    7 kV

    LIMITING VALUES

  • Vg2(b) max

    550 V

    LIMITING VALUES

  • Vg2 max

    300 V

    LIMITING VALUES

  • Vg1 max. (Ig[ = +

    1.3 V

    LIMITING VALUES

Data set 07

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

    1.05 A

    Published nominal value

  • Transconductance

    14000 µS

    Published or referenced operating characteristic

Other

  • Maximum peak anode voltage

    7 kV

    Pulse duration <=22% cycle, max 18 us

  • Audio output power

    20 W

    ClassB, two tubes

Data set 08

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Typical plate voltage

    170 V

  • Typical screen voltage

    170 V