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Power - Triode ·Triode-Triode

6Z7G

Dual power triode developed for Class B push-pull audio amplification at relatively low supply voltage. Its two sections operate together at zero grid bias to provide economical receiver and small-amplifier output power.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
8B
Socket code
IO
Base pins
8
Nominal heater
6.3 V / 300 mA

Description

Class-B power amplifier consisting of two triodes in one envelope. 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
300 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
180 V
Max plate dissipation
8 W
Max cathode current
60 mA

Published handbook ratings and representative operating characteristics reviewed.

Section 2

Triode

X-ray radiationInterelectrode capacitances
Max plate voltage
180 V
Max plate dissipation
8 W
Max cathode current
60 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

    60 mA

    EachSection

  • Plate voltage

    135 V

    ClassB;PushPull;TwoTubes

  • Control-grid voltage

    0 V

    ClassB;PushPull;TwoTubes

  • No-signal plate current per plate

    3 mA

    ClassB;PushPull;TwoTubes

  • Load resistance plate-to-plate

    15000 Ω

    ClassB;PushPull;TwoTubes

  • Power output

    1.5 W

    ClassB;PushPull;TwoTubes

  • Plate voltage

    180 V

    ClassB;PushPull;TwoTubes

  • Control-grid voltage

    0 V

    ClassB;PushPull;TwoTubes

  • No-signal plate current per plate

    4.2 mA

    ClassB;PushPull;TwoTubes

  • Load resistance plate-to-plate

    20000 Ω

    ClassB;PushPull;TwoTubes

  • Power output

    2.2 W

    ClassB;PushPull;TwoTubes

  • Alternate load resistance

    12000 Ω

    ClassB;PushPull;TwoTubes;HigherDrive

  • Alternate power output

    4.2 W

    ClassB;PushPull;TwoTubes;HigherDrive

Data set 02

1938 Raytheon

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Heater Current

    3 A

    Heater Current 03 amp

  • Mazimum Plate Voltage

    180 V

    Mazimum Plate Voltage 180 volts

  • Max, Average Plate Dissipation

    8 W

    Max, Average Plate Dissipation 8 watts

  • Plate Voltage 138

    180 V

    Plate Voltage 138 180 volts

  • Grid Bias 0

    0 V

    Grid Bias 0 0 volts

  • No Signal Plate Current (per plate) 3

    4.2 mA

    No Signal Plate Current (per plate) 3 4,2 ma

  • Power Output 1.5

    2.2 W

    Power Output 1.5 2.2 watts

  • Load Resistance 9000

    12000 Ω

    Load Resistance 9000 12000 ohms

  • Power Output 2.5

    4.2 W

    Power Output 2.5 4,2 watts

Data set 03

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Heater Voltage

    6.3 V

  • Heater Current

    300 mA

Other

  • Power Output

    4.2 W

    ClassB;PlateVoltage=180V

Data set 04

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Maximum plate voltage

    180 V

    Published handbook rating

  • Plate voltage

    180 V

    ClassB PushPull TwoTubes

  • Control-grid bias

    0 V

    ClassA

  • Plate current

    4.2 mA

    ClassA

  • Load resistance

    12000 ohm

    ClassB PushPull TwoTubes

  • Power output

    4.2 W

    ClassB PushPull TwoTubes

Characteristic

  • Heater voltage

    6.3 V

    Published heater rating

  • Heater current

    300 mA

    Published heater rating

Data set 05

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Heater voltage

    6.3 V

    Nominal

  • Heater current

    300 mA

    Nominal

  • Plate voltage

    135 V

    ClassB; OperatingPoint1

  • Effective load resistance plate-to-plate

    15000 ohm

    ClassB; OperatingPoint1

  • Average grid-to-grid power input

    80 mW

    ClassB; OperatingPoint1

  • Power output

    1.5 W

    ClassB; OperatingPoint1

  • Plate voltage

    135 V

    ClassB; OperatingPoint2

  • Effective load resistance plate-to-plate

    9000 ohm

    ClassB; OperatingPoint2

  • Average grid-to-grid power input

    320 mW

    ClassB; OperatingPoint2

  • Power output

    2.5 W

    ClassB; OperatingPoint2

  • Plate voltage

    180 V

    ClassB; OperatingPoint3

  • Effective load resistance plate-to-plate

    20000 ohm

    ClassB; OperatingPoint3

  • Average grid-to-grid power input

    80 mW

    ClassB; OperatingPoint3

  • Power output

    2.2 W

    ClassB; OperatingPoint3

  • Plate voltage

    180 V

    ClassB; OperatingPoint4

  • Effective load resistance plate-to-plate

    12000 ohm

    ClassB; OperatingPoint4

  • Average grid-to-grid power input

    320 mW

    ClassB; OperatingPoint4

  • Power output

    4.2 W

    ClassB; OperatingPoint4

Capacitance

  • Grid to cathode

    4 pF

    Per identical triode

  • Plate to cathode

    5 pF

    Per identical triode

  • Grid to plate

    5 pF

    Per identical triode

  • Grid to grid

    0.22 pF

    Cross-section capacitance

  • Plate to plate

    0.8 pF

    Cross-section capacitance

  • Grid 2 to plate 1

    0.1 pF

    Cross-section capacitance