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Voltage Radio Detector Converter ·Pentode

5GX6

Dual-control sharp-cutoff pentode developed primarily for FM sound-detector service and specialized television circuits. Separate control grids independently influence plate current, enabling detector, gating, mixing, and control functions beyond conventional pentode amplification.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
B7G
Base pins
7
Nominal heater
4.7 V / 600 mA

Description

5GX6 is a Pentode device. Sharp-cutoff dual-control-grid pentode intended primarily for FM sound-detector service.

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
4.7 V
Nominal heater current
600 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
140000 Ω
Transconductance
0.0037 S
Max plate voltage
330 V
Max screen voltage
330 V
Max plate dissipation
3 W
Max screen dissipation
0.65 W

Sharp-cutoff pentode with two independent control grids; electrical counterpart retained.

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

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Heater voltage

    4.7 V

  • Heater current

    600 mA

Data set 02

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • Heater warm-up time

    11 s

  • Grid 1-to-plate transconductance

    3700 uS

  • Grid 3-to-plate transconductance

    750 uS

  • Plate resistance

    0.14 MOhm

Capacitance

  • Grid 1 to plate capacitance

    0.26 pF

  • Grid 1 to grid 3 capacitance

    0.72 pF

  • Grid 3 to plate capacitance

    1.6 pF

Other

  • Maximum grid 2 supply voltage

    300 V

  • Plate supply voltage

    150 V

    FM sound detector

  • Grid 3 supply voltage

    0 V

    FM sound detector

  • Grid 2 supply voltage

    100 V

    FM sound detector

  • Grid 1 supply voltage

    0 V

    FM sound detector

  • Cathode resistor

    180 ohm

    FM sound detector

  • Plate current

    3.7 mA

    FM sound detector

  • Grid 2 current

    3 mA

    FM sound detector

Data set 03

1971 RCA HB3 Binder 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate voltage

    125 V

    DualControlAmplifier

  • Screen voltage

    125 V

    DualControlAmplifier

  • Plate current

    10 mA

    DualControlAmplifier

  • Screen current

    3.5 mA

    DualControlAmplifier

  • Maximum plate voltage

    330 V

  • Maximum screen voltage

    330 V

  • Maximum plate dissipation

    3 W

  • Maximum screen dissipation

    0.65 W

  • Heater/filament voltage

    4.7 V

    DerivativeSheet

  • Heater/filament current

    600 mA

    DerivativeSheet

  • Heater warm-up time

    11 s

    ControlledWarmup

Characteristic

  • Grid No.1 transconductance

    9500 uS

    DualControlAmplifier

  • Grid No.3 transconductance

    7125 uS

    DualControlAmplifier

  • Plate resistance

    180000 ohm

    DualControlAmplifier

Capacitance

  • Grid No.1-to-plate capacitance

    0.02 pF

  • Grid No.3-to-plate capacitance

    0.8 pF