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Power - Pentode (NOT beam) ·Pentode

EL84L

Power pentode designed for low-frequency amplifier output stages. Its miniature construction provides conventional audio power amplification for receivers and other AF equipment.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
B9A
Base pins
9
Nominal heater
6.3 V / 760 mA

Description

Power pentode for low-frequency amplification in output stages.

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
760 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

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
450 V
Max screen voltage
450 V
Max plate dissipation
18.5 W
Max screen dissipation
2.2 W
Max grid dissipation
0.5 W
Max cathode current
100 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

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

    760 mA

    Published heater current.

  • Plate current

    48 mA

    Published basic-parameter operating point.

  • Screen current

    5.5 mA

    Published basic-parameter operating point.

  • Transconductance

    11300 µS

    Published basic-parameter value; normalized to µS.

  • Plate resistance

    40000 Ω

    Published internal/plate resistance.

  • Amplification factor

    19

    Published amplification factor.

  • Input capacitance

    10 pF

    Published in the filename-designated tube entry.

  • Output capacitance

    6 pF

    Published in the filename-designated tube entry.

  • Grid-to-plate capacitance

    0.5 pF

    Published in the filename-designated tube entry.

Other

  • Maximum plate voltage

    450 V

    Published limiting operating value.

  • Maximum screen voltage

    450 V

    Published limiting operating value.

  • Maximum cathode current

    100 mA

    Published limiting cathode-current value.

  • Maximum plate dissipation

    18.5 W

    Published limiting plate-dissipation value.

  • Maximum screen dissipation

    2.2 W

    Published limiting screen-dissipation value.