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Voltage Pentode - Sharp Cutoff (single) ·Pentode-Triode

6AX8

Triode-pentode designed for television video-amplifier and sync-separator service, combining video gain and synchronization functions in one envelope.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 9AE
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 450 mA

Description

Triode-pentode for television video-amplifier and sync-separator 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: 9AE
Socket code: B9A
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 450 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

9AE - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN12P	B	P — Plate (Anode) Chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AE
PIN21G1	A	G1 — Control Grid Chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AE
PIN31G2	A	G2 — Screen Grid Chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AE
PIN4H	—	H — Heater Chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AE
PIN5H	—	H — Heater Chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AE
PIN61P	A	P — Plate (Anode) Chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AE
PIN71G3	A	G3 — Suppressor GridGroup 9AE7 Source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AE
PIN7IS	A	IS — Internal ScreenGroup 9AE7 Source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AE
PIN71K	A	K — CathodeGroup 9AE7 Source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AE
PIN82K	B	K — Cathode Source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AE
PIN92G1	B	G1 — Control Grid Source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AE

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 5000 Ω
Transconductance: 0.0085 S
Amplification factor: 40
Max plate voltage: 300 V
Max plate dissipation: 2.7 W

Medium-mu triode unit; Class A1 values at 150 V plate supply.

Section 2

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 400000 Ω
Transconductance: 0.0048 S
Max plate voltage: 300 V
Max screen voltage: 300 V
Max plate dissipation: 2.8 W
Max screen dissipation: 0.5 W

Sharp-cutoff pentode unit; Class A1 values at 250 V plate and 110 V screen supply.

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

Triode

Other

Heater voltage
6.3 V
Heater current
450 mA
Plate current
18 mA
Typical operating conditions

SECTION 2

Pentode

Other

Heater voltage
6.3 V
Heater current
450 mA
Plate current
18 mA
Typical operating conditions

Data set 02

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
150 V
TriodeSection
Plate current
10 mA
TriodeSection

Characteristic

Plate resistance
6000 Ω
TriodeSection
Transconductance
6500 µS
TriodeSection
Amplification factor
40
TriodeSection

SECTION 2

Pentode

Other

Plate voltage
125 V
PentodeSection
Screen voltage
125 V
PentodeSection
Plate current
12 mA
PentodeSection
Screen current
3.5 mA
PentodeSection

Characteristic

Plate resistance
250000 Ω
PentodeSection
Transconductance
9000 µS
PentodeSection
Cutoff characteristic
Sharp
PentodeSection

Data set 03

1971 RCA HB3 Binder 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Heater voltage nominal
6.3 V
Heater current
450 mA
Maximum plate voltage
300 V
ClassA1

Characteristics

Plate supply voltage
150 V
ClassA1
Cathode resistor
56 ohm
ClassA1
Amplification factor
40
ClassA1
Plate resistance
5000 ohm
ClassA1
Transconductance
8500 µS
ClassA1
Plate current
18 mA
ClassA1
Grid voltage for plate current 10 µA
-12 V
ClassA1

Capacitance

Grid-to-plate capacitance
1.8 pF
Input capacitance
2.5 pF
Output capacitance
1 pF

SECTION 2

Pentode

Other

Heater voltage nominal
6.3 V
Heater current
450 mA
Maximum plate voltage
300 V
ClassA1
Maximum screen supply voltage
300 V
ClassA1

Characteristics

Plate supply voltage
250 V
ClassA1
Screen supply voltage
110 V
ClassA1
Cathode resistor
120 ohm
ClassA1
Plate resistance
400000 ohm
ClassA1
Transconductance
4800 µS
ClassA1
Plate current
10 mA
ClassA1
Screen current
3.5 mA
ClassA1
Grid voltage for plate current 10 µA
-12 V
ClassA1

Capacitance

Grid No.1-to-plate capacitance
0.006 pF
Input capacitance
5 pF
Output capacitance
3.5 pF