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Voltage Pentode - Sharp Cutoff (single) ·Pentode

4CF6

Sharp-cutoff pentode designed for television IF, picture-IF, video, or VHF tuner amplifier service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
B7G
Base pins
7
Nominal heater
4.2 V / 450 mA

Description

The Westinghouse 4CF6 is a sharp-cutoff pentode for television IF amplification.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B7G
Base pins
7
Nominal heater voltage
4.2 V
Nominal heater current
450 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
0.0078 S
Max plate voltage
300 V
Max screen voltage
330 V
Max plate dissipation
2 W
Max screen dissipation
0.55 W

Representative electrical section.

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

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate voltage

    125 V

  • Screen-grid voltage

    125 V

  • Cathode bias resistor

    56 Ohm

  • Plate current

    12.5 mA

  • Screen-grid current

    3.7 mA

Characteristics

  • Plate resistance

    300000 Ohm

  • Transconductance

    7800 uS

  • Control-grid cutoff voltage

    -6 V

Capacitance

  • Grid-to-plate capacitance

    0.025 pF

    Unshielded

  • Input capacitance

    6.5 pF

    Unshielded

  • Output capacitance

    2 pF

    Unshielded

Data set 02

1965 Westinghouse Data Book

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Heater Voltage

    4.2 V

  • Heater Current

    450 mA

  • Transconductance

    7800 uS

    RepresentativePublishedPoint

  • Plate Resistance

    300000 ohm

    RepresentativePublishedPoint

Other

  • Maximum Plate Voltage

    300 V

  • Maximum Plate Dissipation

    2 W