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EF5000

Special-quality secondary-emission pentode for fast wideband and pulse-amplifier circuits, providing exceptionally high transconductance and signal-current capability.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B8G
Base pins: 8
Nominal heater: 6.3 V / 370 mA

Description

Special-quality secondary-emission pentode for wideband and pulse amplifier circuits.

Socket description

Loctal 8-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B8G
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 370 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: 70000 Ω
Transconductance: 0.03 S
Max plate voltage: 300 V
Max screen voltage: 250 V
Max plate dissipation: 5 W

Published ratings/characteristics promoted from the approved 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 La Radiotechnique

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
370 mA
Nominal
Maximum Plate Voltage
300 V
Maximum Screen Voltage
250 V
Maximum Plate Dissipation
5 W

Characteristic

Transconductance
30000 µS
Typical
Amplification Factor
110
Typical
Plate Resistance
70000 ohm
Typical