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Voltage - Dual Triode (similar) ·Triode-Triode

6F8G

Medium-mu twin triode with separate triode systems, intended for general Class-A voltage amplification and phase-inverter service in receiving equipment.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
8G
Socket code
IO
Base pins
8
Nominal heater
6.3 V / 600 mA

Description

Twin triode containing two triode sections in one envelope.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
8G
Socket code
IO
Base pins
8
Nominal heater voltage
6.3 V
Nominal heater current
600 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

8G - Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
7700 Ω
Transconductance
0.0026 S
Amplification factor
20
Max plate voltage
300 V
Max plate dissipation
2.5 W

Representative section for electrically identical repeated sections.

Section 2

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
7700 Ω
Transconductance
0.0026 S
Amplification factor
20
Max plate voltage
300 V
Max plate dissipation
2.5 W

Second physical triode restored.

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

1937 Ken Rad

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

  • Plate Voltage

    50 V

    Plate Voltage £50 Volts Max.

  • Grid Voltage

    -8 V

    Grid Voltage -8 Volts

  • Plate Current

    9 mA

    Plate Current 9.0 Milliamperes

  • Amplification Factor

    20 ratio

    Amplification Factor 20

  • Mutual Conductance

    2600 µS

    Mutual Conductance 2600 Micromhos Approx.

Data set 02

1937 Raytheon Radio Receiving Tubes

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • llaximum Plate Voltage

    250 V

    Published table

Capacitance

  • Grid to Plate

    4.5

    Published table; Column1

  • Grid to Plate

    4.16

    Published table; Column2

  • Input

    3.3 pF

    Published table; Column1

  • Input

    3 pF

    Published table; Column2

  • output

    1.5

    Published table; Column1

  • output

    2

    Published table; Column2

  • Plate Voltage

    250 V

    Published table

  • Grid Bias

    -8 V

    Published table

  • Amplification Factor

    20

    Published table

  • Plate Resistance {approximate)

    7700 ohm

    Published table

  • Transconductance (approximate)

    2600 uS

    Published table

Data set 03

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • “Tension chauffage CA ou CC .. .. .. .. .. 6,3 volts

    6.3 V

    “Tension chauffage CA ou CC .. .. .. .. .. 6,3 volts

  • Courant chauffage ... ... 0,6 ampéres

    600 mA

    Courant chauffage ... ... 0,6 ampéres

  • Tension chauffage CA ou CC... .. .. .. . 6,3 volts

    6.3 V

    Tension chauffage CA ou CC... .. .. .. . 6,3 volts

  • Courant chauffage ... ... ... . o0 . . 0,6 ampére

    600 mA

    Courant chauffage ... ... ... . o0 . . 0,6 ampére

  • Tension grille 0 volt min,

    0 V

    Tension grille 0 volt min,

  • Tension plaque 9,0 250 volts

    250 V

    Tension plaque 9,0 250 volts

  • Courant plaque ... .. v wer e e . 10,0 9 ma.

    9 mA

    Courant plaque ... .. v wer e e . 10,0 9 ma.

  • Résistance interne ... ... «. .. .. .. 6,700 7,700 ohms

    7.7 ohms

    Résistance interne ... ... «. .. .. .. 6,700 7,700 ohms

  • Tension d’alimentation de plaque ... ... 100 250 volts

    250 V

    Tension d’alimentation de plaque ... ... 100 250 volts

  • Tension grilfe ... ... . .. .. .. ~—2,25 --55 volts

    -55 V

    Tension grilfe ... ... . .. .. .. ~—2,25 --55 volts

  • Courant plaque par section ... ... ... 1,5 2,4 ma.

    2.4 mA

    Courant plaque par section ... ... ... 1,5 2,4 ma.

  • Résistance de charge par plaque ... ... 30,000 50,000 ohms

    50 ohms

    Résistance de charge par plaque ... ... 30,000 50,000 ohms

  • Résistance de polarisation automatique 750 1,150 ohms

    1.15 ohms

    Résistance de polarisation automatique 750 1,150 ohms

  • Pour le fonctionnement en inversion de phase, 1a tension de plaque

    1 A

    Pour le fonctionnement en inversion de phase, 1a tension de plaque

Other

  • Tension PlAQUE ... vco e e ene e e e 300 volts max.

    300 V

    Tension PlAQUE ... vco e e ene e e e 300 volts max.

  • Dissipation plaque (par p)aque) 2,5 watts max,

    2.5 W

    Dissipation plaque (par p)aque) 2,5 watts max,

  • Tension efficace utile maximum ... .. 20 65 volts ap.

    65 V

    Tension efficace utile maximum ... .. 20 65 volts ap.

Data set 04

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Plate voltage

    250 V

    ClassA; RepresentativeIdenticalSection

  • Control-grid bias magnitude

    8 V

    ClassA; RepresentativeIdenticalSection

  • Plate current

    9 mA

    ClassA; RepresentativeIdenticalSection

  • Plate resistance

    7700 ohm

    ClassA; RepresentativeIdenticalSection

  • Transconductance

    2600 uS

    ClassA; RepresentativeIdenticalSection

  • Amplification factor

    20

    ClassA; RepresentativeIdenticalSection