Alternatives & variations Download PDF datasheet

6F6G

Indirectly heated output power pentode designed for AC and automobile-radio audio service. Its glass construction provides conventional low-frequency power amplification for receiver output stages.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 7S
Socket code: IO
Base pins: 8
Nominal heater: 6.3 V / 700 mA

Description

Indirectly heated output power pentode for AC and car-radio audio service.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 7S
Socket code: IO
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 700 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

7S - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1IS	A	IS — Internal Screen EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7S
PIN2H	—	H — Heater EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7S
PIN3P	A	P — Plate (Anode) EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7S
PIN4G2	A	G2 — Screen Grid EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7S
PIN5G1	A	G1 — Control Grid EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7S
PIN7H	—	H — Heater EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7S
PIN8G3	A	G3 — Suppressor GridGroup 7S8 EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7S
PIN8K	A	K — CathodeGroup 7S8 EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7S

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 80000 Ω
Transconductance: 0.0025 S
Max plate voltage: 375 V
Max screen voltage: 285 V
Max plate dissipation: 11 W
Max screen dissipation: 3.75 W

Glass-envelope power-amplifier pentode with Class-A output ratings.

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

Pentode

Other

Maximum Plate Voltage
315 V
Published table
Plate Voltage
250 V
ClassA; Column1
Plate Voltage
316 V
ClassA; Column2
Plate Voltage
250 V
ClassA; Column3
§ Screen Voltage
250 V
ClassA; Column1
§ Screen Voltage
315 V
ClassA; Column2
Plate Voltage
375 V
ClassA; Column1
Plate Voltage
375 V
ClassA; Column2
Plate Voltage
350 V
ClassA; Column3
Plate Voltage
350 V
ClassA; Column4
Screen Voltage
250 V
ClassA; Column1
Screen Voltage
250 V
ClassA; Column2
No=Signal Plate Current
34 mA
ClassA; Column1
No=Signal Plate Current
54 mA
ClassA; Column2
No=Signal Plate Current
45 mA
ClassA; Column3
No=Signal Plate Current
50 mA
ClassA; Column4
No-Signal Screen Current
5 mA
ClassA; Column1
No-Signal Screen Current
8 mA
ClassA; Column2
Load Resistance(P to P)
10000 ohm
ClassA; Column1
Load Resistance(P to P)
10000 ohm
ClassA; Column2
Load Resistance(P to P)
6000 ohm
ClassA; Column3
Load Resistance(P to P)
10 ohm
ClassA; Column4
Power Output (approx,)
19 W
ClassA; Column1
Power Output (approx,)
194 W
ClassA; Column2
Power Output (approx,)
18 W
ClassA; Column3
Power Output (approx,)
149 W
ClassA; Column4
With one
6 V
ClassA; Column1
With one
6 V
ClassA; Column2
Input transformer ratio, primary to
1
ClassA; Column1
Input transformer ratio, primary to
2
ClassA; Column2
Input transformer ratio, primary to
3.32
ClassA; Column3
AInput transformer ratio, primery to
1
ClassA; Column1
AInput transformer ratio, primery to
2
ClassA; Column2
AInput transformer ratio, primery to
2.5
ClassA; Column3
Input transformer ratio, primary to
1.67
ClassA; Column3
TInput transformer ratio, primary to
1
ClassA; Column1
TInput transformer ratio, primary to
2
ClassA; Column2
TInput transformer ratio, primary to
1.29
ClassA; Column3

Data set 02

1948 Brimar Radio Valve Manual

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Power output maximum published
10.5 W

Data set 03

1958 Brimar Radio Valve No 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Application

Application
Audio output

Data set 04

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
285 V
ClassA; SingleTube
Screen voltage
285 V
ClassA; SingleTube
Control-grid bias magnitude
20 V
ClassA; SingleTube
Plate current
38 mA
ClassA; SingleTube
Screen current
7 mA
ClassA; SingleTube
Plate resistance
78000 ohm
ClassA; SingleTube
Transconductance
2550 uS
ClassA; SingleTube
Load resistance
7000 ohm
ClassA; SingleTube
Power output
4.8 W
ClassA; SingleTube
Plate voltage
250 V
ClassA; SingleTube
Screen voltage
250 V
ClassA; SingleTube
Control-grid bias magnitude
16.5 V
ClassA; SingleTube
Plate current
34 mA
ClassA; SingleTube
Screen current
6.5 mA
ClassA; SingleTube
Plate resistance
80000 ohm
ClassA; SingleTube
Transconductance
2500 uS
ClassA; SingleTube
Load resistance
7000 ohm
ClassA; SingleTube
Power output
3.2 W
ClassA; SingleTube

Data set 05

1961 Ferranti Technical Handbook

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
250 V
ClassA;SingleEnded
Screen-grid voltage
250 V
ClassA;SingleEnded
Control-grid voltage
-16.5 V
ClassA;SingleEnded
Plate current
34 mA
ClassA;SingleEnded
Screen-grid current
6.5 mA
ClassA;SingleEnded
Load resistance
7000 Ohm
ClassA;SingleEnded
Output power
3.2 W
ClassA;SingleEnded
Plate voltage
315 V
ClassAB;PushPull;TwoTubes
Screen-grid voltage
285 V
ClassAB;PushPull;TwoTubes
Plate-to-plate load resistance
10000 Ohm
ClassAB;PushPull;TwoTubes
Output power
11 W
ClassAB;PushPull;TwoTubes;FixedBias
Output power
10.5 W
ClassAB;PushPull;TwoTubes;CathodeBias

Characteristics

Plate resistance
80000 Ohm
ClassA;SingleEnded
Transconductance
2500 uS
ClassA;SingleEnded

Capacitance

Output capacitance
6.5 pF
Grid-to-plate capacitance
0.5 pF