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Voltage Pentode - High Frequency (single) ·Pentode

EF800

Long-life professional RF/IF pentode for dependable continuous high-frequency amplifier service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
B9A
Base pins
9
Nominal heater
6.3 V / 295 mA

Description

Long-life RF/IF 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
295 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
400000 Ω
Transconductance
0.0075 S
Amplification factor
60
Max plate voltage
250 V
Max screen voltage
250 V
Max plate dissipation
2.5 W
Max screen dissipation
0.7 W
Max cathode current
12.5 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

    170 V

  • Typical Screen Voltage

    170 V

  • Typical Plate Current

    10 mA

  • Typical Screen Current

    2.5 mA

Capacitance

  • Input Capacitance

    8.1 pF

  • Output Capacitance

    3.4 pF

Data set 02

1953 RFT Rundfunk Technik

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Heater voltage

    6.3 V

    Published nominal value

  • Heater current

    300 mA

    Published nominal value

  • Transconductance

    7100 µS

    Published operating characteristic

Data set 03

195X Tesla

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • HeaterVoltageNominal

    6.3 V

    Nominal

  • HeaterCurrentNominal

    300 mA

    Nominal

  • Maximum Plate Voltage

    300 V

  • Maximum Screen Voltage

    300 V

  • Maximum Plate Dissipation

    2.5 W

Characteristic

  • Transconductance

    7000 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

    295 mA

    Published heater current.

  • Plate current

    15 mA

    Published basic-parameter operating point.

  • Screen current

    8.5 mA

    Published basic-parameter operating point.

  • Transconductance

    7500 µS

    Published basic-parameter value; normalized to µS.

  • Plate resistance

    400000 Ω

    Published internal/plate resistance.

  • Amplification factor

    60

    Published amplification factor.

  • Input capacitance

    8.1 pF

    Published in the filename-designated tube entry.

  • Output capacitance

    3.4 pF

    Published in the filename-designated tube entry.

  • Grid-to-plate capacitance

    0.008 pF

    Published in the filename-designated tube entry.

Other

  • Maximum plate voltage

    250 V

    Published limiting operating value.

  • Maximum screen voltage

    250 V

    Published limiting operating value.

  • Maximum cathode current

    12.5 mA

    Published limiting cathode-current value.

  • Maximum plate dissipation

    1.7 W

    Published limiting plate-dissipation value.

  • Maximum screen dissipation

    0.45 W

    Published limiting screen-dissipation value.