EF11

Remote-cutoff pentode designed for RF, IF, and AF amplification. Its extended-control characteristic permits gain regulation across several signal-frequency stages, making it a versatile controlled-gain amplifier.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 200 mA

Description

Remote-cutoff RF/IF/AF pentode.

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: 400000 Ω
Transconductance: 0.0022 S
Amplification factor: 19
Max plate voltage: 300 V
Max screen voltage: 125 V
Max plate dissipation: 2 W
Max screen dissipation: 0.3 W
Max cathode current: 10 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
1.5 W
Maximum Screen Dissipation
0.4 W
Maximum Cathode Current
15 mA

Characteristic

Transconductance
1800 µS
Typical
Plate Resistance
1000000 ohm
Typical

Data set 02

1959 Telefunken

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Cutoff characteristic
Remote cutoff

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
Uncontrolled
Typical screen voltage
100 V
Uncontrolled
Typical plate current
6 mA
Uncontrolled
Transconductance
2200 uS
Uncontrolled
Plate resistance
2 Mohm
Uncontrolled
Screen-grid amplification factor
19

Other

Maximum no-current plate voltage
550 V
Maximum plate voltage
300 V