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Power - Pentode (NOT beam) ·Pentode-Triode

6EB8

Miniature high-mu triode plus sharp-cutoff pentode for television receivers. The pentode provides video-output amplification while the triode serves sync-separator, sync-clipper, or phase-inverter functions.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
9DX
Socket code
B9A
Base pins
9
Nominal heater
6.3 V / 750 mA

Description

Miniature high-mu triode–sharp-cutoff pentode used in television receivers; the pentode is used as a video-output amplifier and the triode in sync-separator, sync-clipper, and phase-inverter circuits.

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.

TerminalSectionConnectionEvidence
PIN12KBK — Cathode

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9DX

PIN22G1BG1 — Control Grid

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9DX

PIN32PBP — 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

PIN61G3AG3 — Suppressor GridGroup 9DX6

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9DX

PIN6ISAIS — Internal ScreenGroup 9DX6

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9DX

PIN61KAK — CathodeGroup 9DX6

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9DX

PIN71G1AG1 — Control Grid

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9DX

PIN81G2AG2 — Screen Grid

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9DX

PIN91PAP — 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
75000 Ω
Transconductance
0.0125 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
40 mA
Rectifier max heater-cathode voltage
200 V

Pentode video-amplifier section; screen voltage governed by chart.

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
12 mA
Rectifier max heater-cathode voltage
200 V

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

Capacitance

  • PentodeGridToPlateCapacitance

    0.1 pF

    Section2;Maximum

SECTION 2

Triode

Capacitance

  • TriodeGridToPlateCapacitance

    4.4 pF

    Section1

Data set 02

1965 Westinghouse Data Book

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Pentode plate resistance

    75000 ohm

Other

  • Grid2 dissipation maximum

    1.1 W

Application

  • Application

    Sharp-cutoff amplifier

SECTION 2

Triode

Characteristics

  • Triode amplification factor

    100

  • Triode plate resistance

    37000 ohm

Application

  • Application

    Sync separator / phase inverter

Data set 03

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate voltage

    200 V

    PentodeSection;VideoAmplifier

  • Grid 2 voltage

    125 V

    PentodeSection;VideoAmplifier

  • Plate current

    25 mA

    PentodeSection;VideoAmplifier

  • Grid 2 current

    7 mA

    PentodeSection;VideoAmplifier

SECTION 2

Triode

Other

  • Plate voltage

    250 V

    TriodeSection

  • Grid 1 voltage

    -2 V

    TriodeSection

  • Plate current

    2 mA

    TriodeSection

Data set 04

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate Voltage

    200 V

    PentodeSection ClassA

  • Screen Voltage

    125 V

    PentodeSection ClassA

  • Plate Current

    25 mA

    PentodeSection ClassA

SECTION 2

Triode

Other

  • Plate Voltage

    200 V

    TriodeSection ClassA

  • Plate Current

    2 mA

    TriodeSection ClassA

Data set 05

1971 RCA HB3 Binder 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate supply voltage

    200 V

    Pentode;ClassA

  • Screen supply voltage

    125 V

    Pentode;ClassA

  • Cathode resistor

    68 ohm

    Pentode;ClassA

  • Plate current

    25 mA

    Pentode;ClassA

  • Screen current

    7 mA

    Pentode;ClassA

  • Maximum plate voltage

    330 V

    Pentode

  • Maximum screen supply voltage

    330 V

    Pentode

  • Plate dissipation

    5 W

    Pentode

  • Screen input

    1.1 W

    Pentode

Characteristic

  • Plate resistance

    7500 ohm

    Pentode

  • Transconductance

    12500 uS

    Pentode

SECTION 2

Triode

Other

  • Heater voltage

    6.3 V

  • Heater current

    450 mA

  • Plate supply voltage

    250 V

    Triode;ClassA

  • Grid voltage

    -2 V

    Triode;ClassA

  • Plate current

    2 mA

    Triode;ClassA

  • Maximum plate voltage

    330 V

    Triode

  • Plate dissipation

    1 W

    Triode

Characteristic

  • Amplification factor

    100

    Triode

  • Plate resistance

    37000 ohm

    Triode

  • Transconductance

    2700 uS

    Triode

Data set 06

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

  • Grid No.1 to Plate

    0.1 pF

    Section2

  • Grid No.1 to Cathode/Heater/Grid No.2/Grid No.3/Internal Shield

    11 pF

    Section2

  • Plate to Cathode/Heater/Grid No.2/Grid No.3/Internal Shield

    4.2 pF

    Section2

Characteristic

  • Plate Supply Voltage

    200 V

    ClassA

  • Grid-No.2 Supply Voltage

    125 V

    ClassA

  • Cathode-Bias Resistor

    68 ohm

    ClassA

  • Plate Current

    25 mA

    ClassA

  • Grid-No.2 Current

    7 mA

    ClassA

SECTION 2

Triode

Capacitance

  • Grid to Plate

    4.4 pF

    Section1

  • Grid to Cathode and Heater

    2.4 pF

    Section1

  • Plate to Cathode and Heater

    0.36 pF

    Section1

Characteristic

  • Plate Supply Voltage

    250 V

    ClassA

  • Grid Voltage

    -2 V

    ClassA

  • Plate Current

    2 mA

    ClassA