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6N7

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

Description

The 6N7 is a DualTriode intended for push-pull Class B audio service. Published ratings, characteristics and typical operating data from the supplied datasheet were captured.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: RMA 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

RMA 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: 330 V
Max plate dissipation: 6.05 W
Max cathode current: 125 mA

Representative row for the identical twin triode units. Absolute maximum plate voltage and average plate dissipation from Class B ratings.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 11000 Ω
Transconductance: 0.0032 S
Amplification factor: 35
Max plate voltage: 330 V
Max plate dissipation: 6.05 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

1940 RCA

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Heater voltage
6.3 V
Published nominal value
Heater current
800 mA
Published nominal value
Transconductance
3200 µS
Published operating characteristic
Amplification factor
35
Published operating characteristic

Other

Maximum plate dissipation
5 W
Published maximum or stated design maximum
Audio power output
10 W
ClassB; 300 V
Audio power output
20 W
TwoTubes; ClassB; 300 V

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

1953 RFT Rundfunk Technik

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
800 mA
Nominal
Maximum Plate Voltage
300 V
Maximum Plate Dissipation
7 W
Maximum Cathode Current
125 mA

Characteristic

Transconductance
3100 µS
Typical
Amplification Factor
35
Typical
Plate Resistance
11000 ohm
Typical

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

Data set 06

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Heater voltage
6.3 V
Heater current
800 mA
Plate voltage
250294 V
Typical operating conditions
Plate current
67 mA
Typical operating conditions

Data set 07

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
250 V
ClassA
Power_output
10 W
PushPull,TwoTubes,ClassB

Characteristic

Transconductance
3200 uS
ClassA
Plate resistance
11000 ohm
ClassA
Amplification factor
35
ClassA

Capacitance

Input capacitance
3 pF
Section1
Output capacitance
3 pF
Section1

Data set 08

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Peak Plate Current
140 mA
ClassB
Plate Voltage
294 V
ClassA
Grid Voltage
-6 V
ClassA
Effective Plate-to-Plate Load Resistance
8000 ohm
ClassB,TwoTubes
Maximum-Signal Power Output
10 W
ClassB,TwoTubes
Total Harmonic Distortion
8 %
ClassB,TwoTubes