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Power - Triode ·Triode-Triode

6Y7G

Twin power triode designed primarily for Class B push-pull audio amplification. Both sections operate together as an output stage, with published conditions providing roughly 8 W from a 250 V supply.

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

Description

Class-B double triode amplifier; French source states characteristics and applications otherwise match Type 79. The French-language source has been translated to English.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
8B
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

8B - 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
Max plate voltage
250 V
Max plate dissipation
11.5 W
Max cathode current
90 mA

Two electrically identical power-triode sections represented once under identical-section compression.

Section 2

Triode

X-ray radiationInterelectrode capacitances
Max plate voltage
250 V
Max plate dissipation
11.5 W
Max cathode current
90 mA

Second identical physical triode section; added to align rows with SectionCount.

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 Raytheon Radio Receiving Tubes

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Peak plate current maximum

    90 mA

    EachSection

  • Plate voltage

    180 V

    ClassB;PushPull;TwoTubes

  • Control-grid voltage

    0 V

    ClassB;PushPull;TwoTubes

  • No-signal plate current per plate

    3.8 mA

    ClassB;PushPull;TwoTubes

  • Load resistance plate-to-plate

    7000 Ω

    ClassB;PushPull;TwoTubes

  • Power output

    5.5 W

    ClassB;PushPull;TwoTubes

  • Plate voltage

    250 V

    ClassB;PushPull;TwoTubes

  • Control-grid voltage

    0 V

    ClassB;PushPull;TwoTubes

  • No-signal plate current per plate

    5.3 mA

    ClassB;PushPull;TwoTubes

  • Load resistance plate-to-plate

    14000 Ω

    ClassB;PushPull;TwoTubes

  • Power output

    8 W

    ClassB;PushPull;TwoTubes

Data set 02

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Heater Voltage

    6.3 V

  • Heater Current

    600 mA

Data set 03

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Plate voltage

    250 V

    ClassB;PushPull;TwoTubes

  • Grid voltage

    0 V

    ClassB;PushPull;TwoTubes

  • Plate current

    5.3 mA

    ClassB;PushPull;TwoTubes

  • Plate-to-plate load resistance

    14000 ohm

    ClassB;PushPull;TwoTubes

  • Power output

    8 W

    ClassB;PushPull;TwoTubes

Data set 04

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Heater voltage

    6.3 V

    Nominal

  • Heater current

    600 mA

    Nominal

  • Plate voltage

    180 V

    ClassB; OperatingPoint1

  • Effective load resistance plate-to-plate

    7000 ohm

    ClassB; OperatingPoint1

  • Average grid-to-grid power input

    380 mW

    ClassB; OperatingPoint1

  • Power output

    5.5 W

    ClassB; OperatingPoint1

  • Plate voltage

    250 V

    ClassB; OperatingPoint2

  • Effective load resistance plate-to-plate

    14000 ohm

    ClassB; OperatingPoint2

  • Average grid-to-grid power input

    380 mW

    ClassB; OperatingPoint2

  • Power output

    8 W

    ClassB; OperatingPoint2

Characteristic

  • Zero-signal plate current per plate

    3.8 mA

    ClassB; OperatingPoint1

  • Zero-signal plate current per plate

    5.3 mA

    ClassB; OperatingPoint2

Capacitance

  • Grid to cathode

    3.6 pF

    Per identical triode

  • Plate to cathode

    4.6 pF

    Per identical triode

  • Grid to plate

    2.6 pF

    Per identical triode

  • Grid 1 to grid 2

    0.3 pF

    Cross-section capacitance

  • Plate 1 to plate 2

    1.7 pF

    Cross-section capacitance

  • Grid 1 to plate 2

    0.12 pF

    Cross-section capacitance

  • Grid 2 to plate 1

    0.12 pF

    Cross-section capacitance