EF5

Philips variable-mu pentode for gain-controlled high-frequency RF and IF amplification in radio receivers.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: P8A
Base pins: 8
Nominal heater: 6.3 V / 200 mA

Description

EF5 is listed in the supplied valve table as a variable-mu pentode. Published operating and characteristic values were transcribed from its target row.

Socket description

European 8-pin side-contact base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: P8A
Base pins: 8
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: 300000 Ω
Transconductance: 0.00185 S
Max plate voltage: 250 V
Max screen voltage: 250 V
Max plate dissipation: 1.5 W
Max screen dissipation: 0.3 W
Max cathode current: 10 mA

Published target-row operating and characteristic values reviewed.

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

1938 Philips Miniwatt Vacuum Tube Catalog

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
250 V
Published European table row
Screen voltage
100 V
Published European table row

Characteristic

Plate resistance
300000 ohm
Published European table row
Heater/filament voltage
6.3 V
Published European table row
Heater/filament current
200 mA
Published European table row

Data set 02

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
-3 V
Typical plate current
8 mA
Transconductance
1700 uS
Controlled-range grid voltage
-46.5 V
Alternative screen voltage
85 V
HigherSlopeOperatingPoint
Alternative transconductance
1850 uS
ScreenVoltage=85V