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6GN8

High-mu triode and sharp-cutoff pentode for television sync, sound-IF, phase-inverter, and video-amplifier service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 9DX
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 750 mA

Description

High-mu triode and sharp-cutoff pentode for television sync, sound-IF, phase-inverter, and video-amplifier service. Explicit heater variant/co-designation of 8EB8 in the approved source.

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: 9DX
Socket code: B9A
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 750 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

9DX - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN12K	B	K — Cathode EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DX
PIN22G1	B	G1 — Control Grid EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DX
PIN32P	B	P — Plate (Anode) EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DX
PIN4H	—	H — Heater EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DX
PIN5H	—	H — Heater EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DX
PIN61G3	A	G3 — Suppressor GridGroup 9DX6 EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DX
PIN6IS	A	IS — Internal ScreenGroup 9DX6 EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DX
PIN61K	A	K — CathodeGroup 9DX6 EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DX
PIN71G1	A	G1 — Control Grid EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DX
PIN81G2	A	G2 — Screen Grid EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DX
PIN91P	A	P — Plate (Anode) EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DX

Section ratings

2 physical sections, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 60000 Ω
Transconductance: 0.0115 S
Max plate voltage: 330 V
Max screen voltage: 330 V
Max plate dissipation: 5 W
Max screen dissipation: 1.1 W
Max cathode current: 50 mA

Video-amplifier pentode section.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 37000 Ω
Transconductance: 0.0027 S
Amplification factor: 100
Max plate voltage: 330 V
Max plate dissipation: 1 W
Max cathode current: 20 mA

High-mu triode section.

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
780 mA
Plate voltage
330330 V
Typical operating conditions
Screen voltage
150 V
Typical operating conditions
Plate current
225 mA
Typical operating conditions

SECTION 2

Triode

Other

Heater voltage
6.3 V
Heater current
780 mA
Plate voltage
330330 V
Typical operating conditions
Screen voltage
150 V
Typical operating conditions
Plate current
225 mA
Typical operating conditions

Data set 02

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Plate resistance
60000 ohm
Transconductance
11500 uS

Other

Maximum plate voltage
330 V
Maximum plate dissipation
5 W
Maximum screen-grid dissipation
1.1 W
Heater voltage
6.3 V
Heater current
750 mA
Typical plate voltage
200 V
Typical screen-grid voltage
150 V
Typical plate current
25 mA
Typical screen-grid current
5.5 mA

SECTION 2

Triode

Characteristic

Plate resistance
37000 ohm
Transconductance
2700 uS
Amplification factor
100

Other

Maximum plate voltage
330 V
Maximum plate dissipation
1 W
Heater voltage
6.3 V
Heater current
750 mA
Typical plate voltage
250 V
Typical plate current
2 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 1 to plate capacitance
0.1 pF
Input capacitance
11 pF
Output capacitance
4.2 pF

Other

Plate voltage
200 V
ClassA1
Plate current
25 mA
ClassA1
Screen voltage
150 V
ClassA1
Screen current
5.5 mA
ClassA1

Characteristics

Instantaneous plate current
55 mA
Plate60V;Screen150V;Grid1=0V

SECTION 2

Triode

Capacitance

Grid-to-plate capacitance
4.4 pF
Input capacitance
2.4 pF
Output capacitance
0.36 pF

Other

Plate voltage
250 V
ClassA1
Plate current
2 mA
ClassA1

Data set 04

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Typical Plate Voltage
200 V
PentodeSection
Typical Screen Voltage
150 V
PentodeSection

Characteristic

Typical Plate Current
25 mA
PentodeSection

SECTION 2

Triode

Other

Typical Plate Voltage
250 V
TriodeSection

Characteristic

Typical Plate Current
2 mA
TriodeSection

Data set 05

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
200 V
Pentode
Plate current
25 mA
Pentode

Characteristic

Transconductance
11500 uS
Pentode
Plate resistance
60000 ohm
Pentode

Capacitance

Grid-to-plate capacitance
0.1 pF
Pentode

SECTION 2

Triode

Other

Heater voltage
6.3 V
Heater current
750 mA
Plate voltage
250 V
Triode
Plate current
2 mA
Triode

Characteristic

Transconductance
2700 uS
Triode
Amplification factor
100
Triode

Capacitance

Grid-to-plate capacitance
4.4 pF
Triode

Data set 06

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Maximum Plate Voltage
330 V
Section2
Maximum Screen Voltage
330 V
Section2
Maximum Plate Dissipation
5 W
Section2
Maximum Screen Dissipation
1.1 W
Section2

Characteristic

Plate Resistance
60000 ohm
Section2
Transconductance
11500 uS
Section2

SECTION 2

Triode

Characteristic

Heater Warm-up Time (Average) —
11 s
Characteristic;PublishedValue1
Heater Warm-up Time (Average) —
11 s
Characteristic;PublishedValue2
Peak value
200 V
Characteristic;PublishedValue1
Peak value
200 V
Characteristic;PublishedValue2
Peak value
200 V
Characteristic;PublishedValue3
Average value
100 V
Characteristic;PublishedValue1
Average value
100 V
Characteristic;PublishedValue2
Average value
100 V
Characteristic;PublishedValue3
Plate Supply Voltage
250 V
Characteristic;PublishedValue1
Plate Supply Voltage
60 V
Characteristic;PublishedValue2
Plate Supply Voltage
200 V
Characteristic;PublishedValue3
Grid-No.l Voltage —
2 V
Characteristic;PublishedValue1
Grid-No.l Voltage —
0 V
Characteristic;PublishedValue2
Plate Resistance (Approx.)
37000 ohm
Characteristic;PublishedValue1
Plate Resistance (Approx.)
60000 ohm
Characteristic;PublishedValue2
Grid-No
2 mA
Characteristic;PublishedValue1
Grid-No
18 mA
Characteristic;PublishedValue2
Grid-No
5.5 mA
Characteristic;PublishedValue3
Grid Voltage (Approx.) for plate current of
20 V
Characteristic;PublishedValue1
Grid Voltage (Approx.) for plate current of
-5 V
Characteristic;PublishedValue2
Grid-No.l Voltage (Approx.) for plate current
100 uA
Characteristic;PublishedValue1
Grid-No.l Voltage (Approx.) for plate current
-10 uA
Characteristic;PublishedValue2
Plate Resistance
37000 ohm
Section1
Transconductance
2700 uS
Section1
Amplification Factor
100
Section1

Other

Plate Voltage
330 V
MaximumRating;PublishedValue1
Plate Voltage
330 V
MaximumRating;PublishedValue2
Grid-No
2 V
MaximumRating;PublishedValue1
Grid-No
330 V
MaximumRating;PublishedValue2
Grid-No.l (Control-Grid) Voltage, Positive-bias value
0 V
MaximumRating;PublishedValue1
Grid-No.l (Control-Grid) Voltage, Positive-bias value
0 V
MaximumRating;PublishedValue2
Plate Dissipation
1 W
MaximumRating;PublishedValue1
Plate Dissipation
5 W
MaximumRating;PublishedValue2
For grid-No
2 V
MaximumRating;PublishedValue1
For grid-No
165 V
MaximumRating;PublishedValue2
Published value
1.1 W
MaximumRating
For grid-No
2 V
MaximumRating;PublishedValue1
For grid-No
165 V
MaximumRating;PublishedValue2
For grid-No
330 V
MaximumRating;PublishedValue3
For grid-No
300 V
MaximumRating;PublishedValue4
For fixed-bias operation
0.5 megohm
MaximumCircuitValue;PublishedValue1
For fixed-bias operation
0.25 megohm
MaximumCircuitValue;PublishedValue2
For cathode-bias operation
1 megohm
MaximumCircuitValue;PublishedValue1
For cathode-bias operation
1 megohm
MaximumCircuitValue;PublishedValue2
Maximum Plate Voltage
330 V
Section1
Maximum Plate Dissipation
1 W
Section1