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EF43

Philips fixed-gain RF and IF amplifier pentode with substantial transconductance and plate-dissipation capability.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: RIMLOCK
Socket code: B8A
Base pins: 8
Nominal heater: 6.3 V / 200 mA

Description

EF43 is described in the supplied Philips datasheet as a RF/IF amplifier pentode. Published electrical ratings, characteristics and operating conditions were extracted from the supplied source.

Socket description

Rimlock 8-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: RIMLOCK
Socket code: B8A
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 200 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

RIMLOCK - 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: 0.0064 S
Max plate voltage: 300 V
Max screen voltage: 250 V
Max plate dissipation: 3.75 W
Max screen dissipation: 0.7 W
Max cathode current: 20 mA

Published ratings, characteristics and operating conditions 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

1963 Philips Electron Tubes Handbook V1a

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Heater voltage
6.3 V
Published heater rating
Heater current
200 mA
Published heater rating

Other

Plate voltage
250 V
RForIFAmplifier
Maximum plate voltage
300 V
Published limit
Maximum plate dissipation
3.75 W
Published limit
Maximum screen voltage
250 V
Published limit
Maximum screen dissipation
0.7 W
Published limit
Maximum cathode current
20 mA
Published limit

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
330 mA
Typical plate voltage
250 V
Typical plate current
15 mA
Typical screen current
3.5 mA
Transconductance
6400 uS
Screen-grid amplification factor
17
Plate resistance
0.5 Mohm

Capacitance

Plate capacitance
4.5 pF
Grid input capacitance
9.5 pF
Plate-grid capacitance maximum
0.006 pF
Grid-heater capacitance maximum
0.2 pF