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

6DX8

High-mu triode plus sharp-cutoff pentode designed for television sync/noise circuitry and video-output service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
9HX
Socket code
B9A
Base pins
9
Nominal heater
6.3 V / 720 mA

Description

High-mu triode plus sharp-cutoff pentode used in television sync/noise circuits and video-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
9HX
Socket code
B9A
Base pins
9
Nominal heater voltage
6.3 V
Nominal heater current
720 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

9HX - Terminal pinout

Electrical assignments shared by every tube using this base designation.

TerminalSectionConnectionEvidence
PIN1Base PinBG1 — Control Grid

Original chart label 2G1; manufacturer verification pending

Unverified

EIA Base Connections printed p133, 9HX

PIN2Base PinBP — Plate (Anode)

Original chart label 2P; manufacturer verification pending

Unverified

EIA Base Connections printed p133, 9HX

PIN3Base PinBK — Cathode

Original chart label 2K; manufacturer verification pending

Unverified

EIA Base Connections printed p133, 9HX

PIN4Base Pin—H — Heater

Original chart label H; manufacturer verification pending

Unverified

EIA Base Connections printed p133, 9HX

PIN5Base Pin—H — Heater

Original chart label H; manufacturer verification pending

Unverified

EIA Base Connections printed p133, 9HX

PIN6Base PinAP — Plate (Anode)

Original chart label 1P; manufacturer verification pending

Unverified

EIA Base Connections printed p133, 9HX

PIN7Base PinAG3 — Suppressor GridGroup 9HX7

Original chart label 1G3; manufacturer verification pending

Unverified

EIA Base Connections printed p133, 9HX

PIN7Base PinAK — CathodeGroup 9HX7

Original chart label 1K; manufacturer verification pending

Unverified

EIA Base Connections printed p133, 9HX

PIN7Base Pin—IS — Internal ScreenGroup 9HX7

Original chart label IS; manufacturer verification pending

Unverified

EIA Base Connections printed p133, 9HX

PIN8Base PinAG1 — Control Grid

Original chart label 1G1; manufacturer verification pending

Unverified

EIA Base Connections printed p133, 9HX

PIN9Base PinAG2 — Screen Grid

Original chart label 1G2; manufacturer verification pending

Unverified

EIA Base Connections printed p133, 9HX

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
16250 Ω
Transconductance
0.004 S
Amplification factor
65
Max plate voltage
300 V
Max plate dissipation
1 W
Max cathode current
12 mA

High-mu triode section.

Section 2

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
130000 Ω
Transconductance
0.0104 S
Amplification factor
65
Max plate voltage
300 V
Max screen voltage
300 V
Max plate dissipation
4 W
Max screen dissipation
1.7 W
Max cathode current
40 mA

Sharp-cutoff video-output pentode 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

1963 Amperex Condensed

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Triode plate voltage

    200 V

    TriodeSection KeyedAGC

  • Triode control-grid bias

    -1.7 V

    TriodeSection KeyedAGC

  • Triode plate current

    3 mA

    TriodeSection KeyedAGC

Characteristic

  • Triode amplification factor

    65

    TriodeSection KeyedAGC

SECTION 2

Pentode

Characteristic

  • Heater voltage

    6.3 V

    Published heater rating

  • Heater current

    720 mA

    Published heater rating

  • Pentode plate resistance

    3000 ohm

    PentodeSection VideoOutput

  • Pentode transconductance

    9700 µS

    PentodeSection VideoOutput

Other

  • Pentode screen voltage

    220 V

    PentodeSection VideoOutput

  • Pentode plate current

    18 mA

    PentodeSection VideoOutput

  • Pentode screen current

    3.1 mA

    PentodeSection VideoOutput

Data set 02

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Plate voltage

    200 V

    TriodeSection

  • Plate current

    3 mA

    TriodeSection

  • Peak pulse plate voltage

    600 V

    TriodeSection

SECTION 2

Pentode

Other

  • Plate voltage

    170 V

    PentodeSection

  • Grid 2 voltage

    170 V

    PentodeSection

  • Grid 1 bias

    -2.1 V

    PentodeSection

  • Plate current

    18 mA

    PentodeSection

  • Grid 2 current

    3 mA

    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

    6.3 V

  • Heater current

    720 mA

  • Plate voltage

    200 V

    Triode;ClassA

  • Grid voltage

    -1.7 V

    Triode;ClassA

  • Plate current

    3 mA

    Triode;ClassA

  • Maximum plate voltage

    300 V

    Triode

  • Plate dissipation

    1 W

    Triode

Characteristic

  • Amplification factor

    65

    Triode

  • Transconductance

    4000 uS

    Triode

Capacitance

  • Grid-to-plate capacitance

    2.7 pF

    Triode

SECTION 2

Pentode

Other

  • Plate voltage

    200 V

    Pentode;ClassA

  • Screen voltage

    200 V

    Pentode;ClassA

  • Grid voltage

    -2.9 V

    Pentode;ClassA

  • Plate current

    18 mA

    Pentode;ClassA

  • Screen current

    3 mA

    Pentode;ClassA

  • Plate dissipation

    4 W

    Pentode

Characteristic

  • Plate resistance

    130000 ohm

    Pentode

  • Transconductance

    10400 uS

    Pentode

Capacitance

  • Grid-to-plate capacitance

    0.1 pF

    Pentode

  • Input capacitance

    9 pF

    Pentode

  • Output capacitance

    4.5 pF

    Pentode

Data set 04

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Heater Voltage (ac/dc) 6.3

    10.2 V

    Published in approved ECL84 target datasheet entry; Section1

  • Heater Current 0.72

    450 mA

    Published in approved ECL84 target datasheet entry; Section1

  • Plate Supply Voltage 550

    550 V

    Published in approved ECL84 target datasheet entry; Section1

  • Plate Voltage 300

    300 V

    Published in approved ECL84 target datasheet entry; Section1

  • Grid-No.2 Voltage

    300 V

    Published in approved ECL84 target datasheet entry; Section1

  • Cathode Current 12

    40 mA

    Published in approved ECL84 target datasheet entry; Section1

  • Plate Dissipation 1

    4 W

    Published in approved ECL84 target datasheet entry; Section1

  • Grid-No.2 Input

    1.7 W

    Published in approved ECL84 target datasheet entry; Section1

  • Plate Voltage 200 170 200

    220 V

    Published in approved ECL84 target datasheet entry; Section1

  • For fixed-bias operation 1

    1 MΩ

    Published in approved ECL84 target datasheet entry; Section1

  • For cathode-bias operation 3

    2 MΩ

    Published in approved ECL84 target datasheet entry; Section1

  • • With maximum duty factor of 0.18 and maximum pulse duration of

    18 microseconds

    Published in approved ECL84 target datasheet entry; Section1

  • the frequency range from 470 to

    890 MHz

    Published in approved ECL84 target datasheet entry; Section1

Characteristic

  • Grid No.l Voltage —1.7 —2.1

    -3.4 V

    Published in approved ECL84 target datasheet entry; Section1

  • Plate Resistance (Approx.) — 0.1 0.13

    0.15 MΩ

    Published in approved ECL84 target datasheet entry; Section1

  • Transconductance 4000 11000 10400

    10000 µS

    Published in approved ECL84 target datasheet entry; Section1

  • Plate Current 3 18 18

    18 mA

    Published in approved ECL84 target datasheet entry; Section1

  • Grid-No.2 Current — 3 3

    3 mA

    Published in approved ECL84 target datasheet entry; Section1

  • Heater Voltage (ac/dc)

    6.3 V

    Published in approved ECL84 target datasheet entry; Section1

  • Heater Current

    225 mA

    Published in approved ECL84 target datasheet entry; Section1

  • Grid to Plate

    18 pF

    Published in approved ECL84 target datasheet entry; Section1

  • Grid to Cathode and Heater

    2.2 pF

    Published in approved ECL84 target datasheet entry; Section1

  • Plate to Cathode and Heater

    1.3 pF

    Published in approved ECL84 target datasheet entry; Section1

SECTION 2

Pentode

Other

  • Heater Voltage (ac/dc) 6.3

    10.2 V

    Published in approved ECL84 target datasheet entry; Section2

  • Heater Current 0.72

    450 mA

    Published in approved ECL84 target datasheet entry; Section2

  • Plate Supply Voltage 550

    550 V

    Published in approved ECL84 target datasheet entry; Section2

  • Plate Voltage 300

    300 V

    Published in approved ECL84 target datasheet entry; Section2

  • Grid-No.2 Voltage

    300 V

    Published in approved ECL84 target datasheet entry; Section2

  • Cathode Current 12

    40 mA

    Published in approved ECL84 target datasheet entry; Section2

  • Plate Dissipation 1

    4 W

    Published in approved ECL84 target datasheet entry; Section2

  • Grid-No.2 Input

    1.7 W

    Published in approved ECL84 target datasheet entry; Section2

  • Plate Voltage 200 170 200

    220 V

    Published in approved ECL84 target datasheet entry; Section2

  • For fixed-bias operation 1

    1 MΩ

    Published in approved ECL84 target datasheet entry; Section2

  • For cathode-bias operation 3

    2 MΩ

    Published in approved ECL84 target datasheet entry; Section2

  • • With maximum duty factor of 0.18 and maximum pulse duration of

    18 microseconds

    Published in approved ECL84 target datasheet entry; Section2

  • the frequency range from 470 to

    890 MHz

    Published in approved ECL84 target datasheet entry; Section2

Characteristic

  • Grid No.l Voltage —1.7 —2.1

    -3.4 V

    Published in approved ECL84 target datasheet entry; Section2

  • Plate Resistance (Approx.) — 0.1 0.13

    0.15 MΩ

    Published in approved ECL84 target datasheet entry; Section2

  • Transconductance 4000 11000 10400

    10000 µS

    Published in approved ECL84 target datasheet entry; Section2

  • Plate Current 3 18 18

    18 mA

    Published in approved ECL84 target datasheet entry; Section2

  • Grid-No.2 Current — 3 3

    3 mA

    Published in approved ECL84 target datasheet entry; Section2

  • Heater Voltage (ac/dc)

    6.3 V

    Published in approved ECL84 target datasheet entry; Section2

  • Heater Current

    225 mA

    Published in approved ECL84 target datasheet entry; Section2

  • Grid to Plate

    18 pF

    Published in approved ECL84 target datasheet entry; Section2

  • Grid to Cathode and Heater

    2.2 pF

    Published in approved ECL84 target datasheet entry; Section2

  • Plate to Cathode and Heater

    1.3 pF

    Published in approved ECL84 target datasheet entry; Section2

Data set 05

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Triode plate voltage

    250 V

    Section2

  • Triode plate dissipation

    1 W

    Section2

Characteristics

  • Triode amplification factor

    65

    Section2

SECTION 2

Pentode

Other

  • Pentode plate voltage

    250 V

    Section1

  • Pentode screen voltage

    250 V

    Section1

  • Pentode plate dissipation

    4 W

    Section1

  • Pentode screen dissipation

    1.7 W

    Section1

  • Pentode cathode current

    40 mA

    Section1

  • Flate woltage(without curreats)

    550 volts

    PublishedLine: Flate woltage(without curreats) 550 volts

  • Plate woltage

    250 volts

    PublishedLine: Plate woltage 250 volts

  • with cathods bLias

    2 megohms

    PublishedLine: with cathods bLias 2 megohms

  • Flate voltege(without curr nt)

    550 volts

    PublishedLine: Flate voltege(without currént) ;550 volts

  • Feak plate voltage(see note

    633 volts

    PublishedLine: Feak plate voltage(see note 1) 633 volts

  • Flate disaipation

    1 watt

    PublishedLine: Flate disaipation 1 watt

  • with cathede bias

    3 megohms

    PublishedLine: with cathede bias 3 megohms

  • Flate voltags

    200 volts

    PublishedLine: Flate voltags 200 volts

  • Flate sugpl voltaga

    250 volts

    PublishedLine: | Flate sugpl: voltaga 200 250 volts

  • grid No

    250 volts

    PublishedLine: grid No.2 supply voltage 200 250 volts

  • Nax.-signal plate currant

    15 mA

    PublishedLine: Nax.-signal plate currant 18.5 15.0 mA

  • surTant G.

    4.5 mA

    PublishedLine: surTant G.& 4.5 mA

  • Plate losd resistancs

    17500 ohms

    PublishedLine: Plate losd resistancs 1,000 17,500 ohms

  • Pomar output

    1.65 watts

    PublishedLine: Pomar output 1.65 1.65 watts

  • Connon cathode resistor

    117 ohms

    PublishedLine: Connon cathode resistor 117 ohms

Characteristics

  • Pentode transconductance

    10000 uS

    Section1

  • Pentode amplification factor g2-g1

    36

    Section1