Skip to main content

Voltage Pentode ·Pentode

EF12

Pentode designed for RF, IF, and AF amplification, with documented triode-connected operation as well. Its broad signal-amplifier capability spans several receiver and audio-frequency stages rather than a single specialized function.

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

Description

RF/IF/AF pentode with triode-connected operation.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
-
Base pins
-
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
800000 Ω
Transconductance
0.0021 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
20 mA

Published ratings and characteristics promoted from the approved German source.

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 RFT Rundfunk Technik

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

    250 V

  • Maximum Screen Voltage

    250 V

  • Maximum Plate Dissipation

    2 W

  • Maximum Screen Dissipation

    0.5 W

  • Maximum Cathode Current

    20 mA

Characteristic

  • Transconductance

    2200 µS

    Typical

  • Plate Resistance

    800000 ohm

    Typical

Data set 02

1959 Telefunken

Published operating points and test conditions from this source.

SECTION 1

Pentode

Application

  • Triode-connected operation

    Published

    TriodeConnection

Data set 03

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Heater voltage

    6.3 V

  • Heater current

    200 mA

  • Typical plate voltage

    250 V

  • Typical screen voltage

    100 V

  • Typical grid voltage

    -2 V

  • Typical plate current

    3 mA

  • Typical screen current

    1 mA

  • Transconductance

    2100 uS

  • Plate resistance

    2 Mohm

  • Screen-grid amplification factor

    25

Capacitance

  • Plate capacitance

    6.5 pF

  • Grid input capacitance

    6.5 pF

  • Plate-grid capacitance maximum

    0.002 pF

  • Grid-heater capacitance maximum

    0.03 pF

Other

  • Triode-connected maximum plate voltage

    200 V

    TriodeConnection