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6GK6

Power pentode designed for Class-A and push-pull Class-AB/B audio-frequency output service, also applicable to video power amplification.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 9GK
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 760 mA

Description

Power pentode for Class A and push-pull Class AB/B audio-frequency output service.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 9GK
Socket code: B9A
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 760 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

9GK - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1Base Pin	—	K — Cathode Literal label K; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9GK
PIN2Base Pin	—	G1 — Control Grid Literal label G1; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9GK
PIN3Base Pin	—	G3 — Suppressor GridGroup 9GK3 Literal label G3; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9GK
PIN3Base Pin	—	IS — Internal ScreenGroup 9GK3 Literal label IS; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9GK
PIN4Base Pin	—	H — Heater Literal label H; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9GK
PIN5Base Pin	—	H — Heater Literal label H; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9GK
PIN6Base Pin	—	P — Plate (Anode) Literal label P; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9GK
PIN7Base Pin	—	G2 — Screen Grid Literal label G2; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9GK
PIN8Base Pin	—	G3 — Suppressor GridGroup 9GK8 Literal label G3; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9GK

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 38000 Ω
Transconductance: 0.0113 S
Amplification factor: 19
Max plate voltage: 330 V
Max screen voltage: 330 V
Max plate dissipation: 13.2 W
Max screen dissipation: 2 W
Max cathode current: 65 mA

Average screen-dissipation rating promoted; 4 W peak screen dissipation preserved as parameter.

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

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Heater voltage
6.3 V
Heater current
760 mA
Plate voltage
3304 V
Typical operating conditions
Screen voltage
330 V
Typical operating conditions

Data set 02

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Maximum plate voltage
330 V
Maximum screen-grid voltage
330 V
Maximum plate dissipation
13.2 W
Maximum screen-grid dissipation
2 W
Maximum cathode current
65 mA
Heater voltage
6.3 V
Heater current
760 mA

Data set 03

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

Grid-to-plate capacitance
0.14 pF
Input capacitance
10 pF
Output capacitance
7 pF

Other

Plate supply voltage maximum
605 V
Screen supply voltage maximum
605 V
Peak screen dissipation
4 W
Plate voltage
250 V
ClassA
Screen voltage
250 V
ClassA
Control-grid voltage
-7.3 V
ClassA
Cathode bias resistor
135 ohm
ClassA
Zero-signal plate current
48 mA
ClassA
Zero-signal screen current
5.5 mA
ClassA
Load resistance
5200 ohm
ClassA
Power output
5.7 W
ClassA
Total harmonic distortion
10 %
ClassA
Plate-to-plate load resistance
8000 ohm
PushPull;TwoTubes;ClassAB
Power output
17 W
PushPull;TwoTubes;ClassAB;300V

Data set 04

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

PeakScreenDissipation
4 W
Typical Plate Voltage
250 V
ClassA
Typical Screen Voltage
250 V
ClassA
Maximum Signal Power Output
5.7 W
ClassA
Total Harmonic Distortion
10 %
ClassA

Characteristic

Grid2ToGrid1AmplificationFactor
19

Data set 05

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Heater voltage
6.3 V
Heater current
760 mA
Plate voltage
250 V
ClassA
Screen voltage
250 V
ClassA
Plate current
48 mA
ClassA
Power output
5.7 W
ClassA
Maximum plate voltage
330 V
Maximum screen voltage
330 V
Maximum cathode current
65 mA
Plate dissipation
13.2 W

Characteristic

Plate resistance
38000 ohm
ClassA
Transconductance
11300 uS
ClassA

Capacitance

Grid-to-plate capacitance
0.14 pF

Data set 06

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

Grid No.1-to-plate capacitance
0.14 pF
Maximum

Other

Plate supply voltage
250 V
ClassA
Screen-grid supply voltage
250 V
ClassA
Cathode-bias resistor
135 ohm
ClassA
Zero-signal plate current
48 mA
ClassA
Maximum-signal plate current
50.6 mA
ClassA
Maximum-signal screen-grid current
10 mA
ClassA
Effective load resistance
5200 ohm
ClassA
Maximum-signal power output
5.7 W
ClassA
Power output
17 W
ClassAB PushPull TwoTubes