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6N7G

Dual power triode intended primarily for Class B audio power-amplifier service. Published push-pull operation produces about 10 W, while the sections may also be paralleled for lower-power Class A use.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 8B
Socket code: IO
Base pins: 8
Nominal heater: 6.3 V / 800 mA

Description

Dual power triode intended for Class B power-amplifier service.

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: 800 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

Plate resistance: 11000 Ω
Transconductance: 0.0032 S
Amplification factor: 35
Max plate voltage: 300 V
Max plate dissipation: 10 W
Max cathode current: 125 mA

Promoted from printed maximum-rating/characteristic columns; additional published operating points and capacitances retained as parameters.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 11000 Ω
Transconductance: 0.0032 S
Amplification factor: 35
Max plate voltage: 300 V
Max plate dissipation: 10 W
Max cathode current: 125 mA

Second identical physical triode section; added to align physical 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

Plate voltage
300 V
ClassB;PushPull;TwoTubes
No-signal plate current per plate
17.5 mA
ClassB;PushPull;TwoTubes
Load resistance plate-to-plate
10000 Ω
ClassB;PushPull;TwoTubes
Power output
10 W
ClassB;PushPull;TwoTubes
Plate voltage
294 V
ClassA;ParallelSections
Grid bias
-6 V
ClassA;ParallelSections
Plate current
7 mA
ClassA;ParallelSections
Power output
400 mW
ClassA;ParallelSections

Characteristic

Transconductance
3200 µS
ClassA;ParallelSections
Amplification factor
35
ClassA;ParallelSections

Data set 02

1948 Brimar Radio Valve Manual

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Heater Voltage
6.3 V
Heater Current
800 mA

Data set 03

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Triode

Application

Service
Class B power amplifier
ClassB

Data set 04

1958 Brimar Radio Valve No 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Power output Class B both sections
10 W
ClassB

Data set 05

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
300 V
ClassB PushPull TwoTubes
Control-grid voltage
0 V
ClassB PushPull TwoTubes
Plate current
35 mA
ClassB PushPull TwoTubes
Load resistance
8000 Ω
ClassB PushPull TwoTubes
Power output
10 W
ClassB PushPull TwoTubes
Plate voltage
294 V
ClassA Parallel
Control-grid voltage
-6 V
ClassA Parallel
Plate current
7 mA
ClassA Parallel

Characteristic

Plate resistance
11000 Ω
ClassA Parallel
Transconductance
3200 µS
ClassA Parallel
Amplification factor
35
ClassA Parallel