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Power - Pentode Single (NOT beam) (under 10W) ·Pentode

EL844

EL844 audio-frequency output pentode. Manufacturer documentation identifies it as a dedicated low-frequency power tube for amplifier output stages.

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

Description

The source identifies this device as EL844 A. F. output pentode.

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
100000 Ω
Transconductance
0.0065 S
Max plate voltage
300 V
Max screen voltage
300 V
Max plate dissipation
9 W
Max screen dissipation
2 W
Max cathode current
60 mA

Image-only JJ Electronic sheet read visually; R.F. output pentode with 9 W plate dissipation limit.

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

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

    -7.2 V

  • Typical Plate Current

    10 mA

  • Typical Screen Current

    1.5 mA

Characteristic

  • Plate Capacitance

    6.6 pF

  • GridCapacitance

    10.8 pF

  • GridPlateCapacitance

    0.1 pF

  • GridFilamentCapacitance

    0.15 pF

Data set 02

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

  • Ua

    300 V

    Published value

  • Ug2

    300 V

    Published value

  • Ug1

    -100 V

    Published value

  • Wa

    9 W

    Published value

  • Wg2

    2 W

    Published value

  • Ik

    60 mA

    Published value

  • Uk/f

    100 V

    Published value

  • Rg1

    1 MΩ

    Published value

  • Rg1

    0.5 MΩ

    Published value

Characteristics

  • Ua

    250 V

    Published value

  • Ug2

    250 V

    Published value

  • Ug1

    -7.3 V

    Published value

  • Ia

    10 mA

    Published value

  • Ig2

    1.5 mA

    Published value

  • S

    6500 µS

    Published value