EF13

Low-noise remote-cutoff RF pentode designed for sensitive controlled-gain high-frequency amplification. It combines reduced noise with a gradual cutoff characteristic for receiver stages requiring both sensitivity and automatic gain regulation.

Directly heatedCold cathodeCommon cathodeDissimilar

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

Description

Low-noise remote-cutoff RF 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: 600000 Ω
Transconductance: 0.0023 S
Max plate voltage: 300 V
Max screen voltage: 300 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
1200000 ohm
Typical

Data set 02

1959 Telefunken

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Cutoff characteristic
Remote cutoff
Low-noise design
Yes

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
4.5 mA
Typical screen current
0.6 mA
Transconductance
2300 uS
Plate resistance
0.5 Mohm
Equivalent noise resistance
2500 ohm

Capacitance

Plate capacitance
7.8 pF
Grid input capacitance
6.3 pF
Plate-grid capacitance maximum
0.005 pF