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EF51

High-transconductance pentode developed for ultra-short-wave RF amplification in demanding VHF receiver and broadband stages.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B8G
Base pins: 8
Nominal heater: 6.3 V / 350 mA

Description

RF pentode for ultra-short-wave amplification. The supplied Philips source was read for heater data, ratings, characteristics, operating conditions, and capacitances; special secondary-emission quantities are retained as parameters where standard section fields do not apply.

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: 350 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: 500000 Ω
Transconductance: 0.0095 S
Max plate voltage: 300 V
Max screen voltage: 300 V
Max plate dissipation: 4.5 W
Max screen dissipation: 1 W
Max cathode current: 20 mA

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

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Heater voltage
6.3 V
Heater current
350 mA
Typical plate voltage
250 V
Typical grid voltage
-2 V
Typical plate current
14 mA
Typical screen current
2.6 mA
Transconductance
9500 uS
Plate resistance
0.5 Mohm
Screen-grid amplification factor
65
Equivalent noise resistance
100 ohm

Capacitance

Plate-grid capacitance maximum
0.007 pF
Plate capacitance
4 pF
Grid input capacitance
10 pF
Grid-heater capacitance maximum
0.02 pF