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Voltage Pentode - Remote Cutoff (single) ·Pentode

EF805S

Long-life remote-cutoff pentode for stable professional RF and IF amplification with automatic gain control.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
B9A
Base pins
9
Nominal heater
6.3 V / 300 mA

Description

Long-life remote-cutoff 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
300 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
350000 Ω
Transconductance
0.0065 S
Max plate voltage
250 V
Max screen voltage
250 V
Max plate dissipation
2 W
Max screen dissipation
0.5 W
Max cathode current
12.5 mA

Published Telefunken values promoted where applicable; additional values retained as parameters.

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

    200 V

  • Typical Screen Voltage

    200 V

  • Typical Plate Current

    10 mA

  • Typical Screen Current

    2.5 mA

Capacitance

  • Input Capacitance

    7.7 pF

  • Output Capacitance

    3.7 pF

Data set 02

1959 Telefunken

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Cutoff characteristic

    Remote cutoff