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Voltage Pentode - Remote Cutoff (single) ·Pentode

UF43

Variable-mu or remote-cutoff pentode designed for RF, IF, broadband, or AVC-controlled receiver amplification.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
B8A
Base pins
8
Nominal heater
21 V / 100 mA

Description

Variable-mu high-slope series-heater RF pentode for wide-band amplifier service.

Socket description

Rimlock 8-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B8A
Base pins
8
Nominal heater voltage
21 V
Nominal heater current
100 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
0.0064 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

Variable-mu wide-band RF/IF pentode.

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

1957 Philips Receiving and Amplifying Tubes

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate Voltage

    170 V

  • Plate Current

    15 mA

  • Screen Voltage

    135 V

  • Screen Current

    4 mA

Characteristic

  • Transconductance

    5800 µS

  • Plate Resistance

    400000 ohm

Data set 02

1963 Philips Electron Tubes Handbook V1

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate voltage

    200 V

    RF/IF amplifier

  • Screen voltage

    135 V

    RF/IF amplifier

  • Plate current

    15 mA

    RF/IF amplifier

  • Screen current

    3.5 mA

    RF/IF amplifier

  • Maximum plate voltage

    300 V

  • Maximum screen voltage

    250 V

  • Maximum plate dissipation

    3.75 W

Characteristic

  • Transconductance

    6400 uS

  • Plate resistance

    0.3 Mohm

Data set 03

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Capacitances Ca

    4.5 a

    Capacitances Ca = 4,5 pF

  • Capacités Cgt

    9.5 a

    Capacités Cgt = 9,5 pF