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Voltage Pentode ·Pentode

EF806S

Long-life low-noise pentode for high-quality microphone, recording, and precision audio preamplifier stages.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
B9A
Base pins
9
Nominal heater
6.3 V / 200 mA

Description

Long-life low-noise AF 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
200 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
2000000 Ω
Transconductance
0.002 S
Max plate voltage
300 V
Max screen voltage
200 V
Max plate dissipation
1 W
Max screen dissipation
0.2 W
Max cathode current
6 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 AEG

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Typical Plate Voltage

    250 V

  • Typical Screen Voltage

    140 V

  • Typical Plate Current

    3.2 mA

  • Typical Screen Current

    0.6 mA

Capacitance

  • Input Capacitance

    4 pF

  • Output Capacitance

    5.5 pF

Data set 02

1959 Telefunken

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Low-noise design

    Yes

Application

  • Triode-connected operation

    Published

    TriodeConnection

Data set 03

195X Tesla

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • HeaterVoltageNominal

    6.3 V

    Nominal

  • HeaterCurrentNominal

    200 mA

    Nominal

  • Maximum Plate Voltage

    300 V

  • Maximum Screen Voltage

    300 V

  • Maximum Plate Dissipation

    1 W

Characteristic

  • Transconductance

    2200 µS

    Typical

Data set 04

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

    200 mA

    Published heater current.

  • Plate current

    3.2 mA

    Published basic-parameter operating point.

  • Screen current

    0.6 mA

    Published basic-parameter operating point.

  • Transconductance

    2000 µS

    Published basic-parameter value; normalized to µS.

  • Plate resistance

    2500000 Ω

    Published internal/plate resistance.

  • Amplification factor

    38

    Published amplification factor.

  • Input capacitance

    4 pF

    Published in the filename-designated tube entry.

  • Output capacitance

    5.5 pF

    Published in the filename-designated tube entry.

  • Grid-to-plate capacitance

    0.05 pF

    Published in the filename-designated tube entry.

Other

  • Maximum plate voltage

    300 V

    Published limiting operating value.

  • Maximum screen voltage

    200 V

    Published limiting operating value.

  • Maximum cathode current

    6 mA

    Published limiting cathode-current value.

  • Maximum plate dissipation

    1 W

    Published limiting plate-dissipation value.

  • Maximum screen dissipation

    0.2 W

    Published limiting screen-dissipation value.

Data set 05

2026 JJ Electronic

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

  • Uf

    6.3 V

    Published value

  • If

    200 mA

    Published value

Characteristics

  • Ua

    250 V

    Published value

  • Ug3

    0 V

    Published value

  • Ug2

    140 V

    Published value

  • Ia

    3 mA

    Published value

  • Ig2

    0.6 mA

    Published value

  • Ri

    2.5 MΩ

    Published value

  • µg2/g1

    38

    Published value

Other

  • Ua0

    550 V

    Published value

  • Ua

    300 V

    Published value

  • Wa

    1 W

    Published value

  • Ug20

    550 V

    Published value

  • Ug2

    200 V

    Published value

  • Wg2

    0.2 W

    Published value

  • Rg1

    10 MΩ

    Published value