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Voltage Dual Pentode ·Pentode-Pentode

6LE8

Twin pentode designed for color-television chroma processing, combining color demodulation with matrix amplification in one compact receiving tube.

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

Description

Twin pentode used as a combined color demodulator and matrix amplifier in color television receivers.

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
9QZ
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

9QZ - Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

2 physical sections, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
50000 Ω
Transconductance
0.011 S
Max plate voltage
300 V
Max screen voltage
150 V
Max plate dissipation
2 W
Max screen dissipation
2 W

Representative specification for both identical pentode sections.

Section 2

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
50000 Ω
Transconductance
0.011 S
Max plate voltage
300 V
Max screen voltage
150 V
Max plate dissipation
2 W
Max screen dissipation
2 W

Second physical pentode restored under one-row-per-physical-section policy; identical shared-section specification.

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

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Maximum Plate Voltage

    300 V

  • Maximum Screen Voltage

    150 V

  • Maximum Plate Dissipation

    2 W

  • Maximum Screen Dissipation

    2 W

Characteristic

  • Transconductance

    11000 uS

Construction

  • SharedSectionSpecification

    1

    AppliesEquallyToBothPhysicalPentodeSections

Data set 02

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Heater voltage nominal

    6.3 V

  • Heater current

    760 mA

  • COMMON-CATHODE, GRID No. l & GRID No

    2

    Published source row

  • DC Plate Voltage (Each unit) Eb

    300 V

    Published source row

  • DC Grid-No

    2 V

    Published source row

  • DC Grid-No (value 2)

    150 V

    Published source row

  • Heater Voltage, AC or DC E(f

    5.7 V

    Published source row

  • Heater Voltage, AC or DC E(f (value 2)

    6.9 V

    Published source row

  • Grid-No

    2

    Published source row

  • Plate Dissipation Each unit P

    2 W

    Published source row

  • b For this test, EcI =

    -3

    Published source row

  • b For this test, EcI = (value 2)

    2

    Published source row

Characteristics

  • Neater Voltage, AC or DC Ef

    6.3 V

    Published source row

  • Heater Current If

    760 mA

    Published source row

  • Plate Resistance rp

    50000

    Published source row

  • Grid-No.l-to-Plate Transconductance g m(g1p)

    5800

    Published source row

  • Grid-No

    3 µS

    Published source row

  • Grid-No (value 2)

    350 µS

    Published source row

  • DC Plate Current ly

    7.6 mA

    Published source row

  • DC r Grid-No

    2 mA

    Published source row

  • DC r Grid-No (value 2)

    14.5 mA

    Published source row

  • Cutoff DC Grid-N o

    3

    Published source row

  • Heater Voltage Ef

    6.3 V

    Published source row

  • DC Plate Voltage Ey

    100 V

    Published source row

  • DC Grid—No

    3 V

    Published source row

  • DC Grid—No (value 2)

    0 V

    Published source row

  • DC Grid-No

    2 V

    Published source row

  • DC Grid-No (value 2)

    100 V

    Published source row

  • DC Grid-No. l (Control-Grid) Voltage Ecl

    -2.5 V

    Published source row

Data set 03

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Heater Voltage

    6.3 V

    Nominal

  • Heater Current

    760 mA

    Nominal

  • Plate Voltage

    100 V

    ClassA;Grid1Control

  • Screen Voltage

    100 V

    ClassA;Grid1Control

  • Control Grid Voltage

    -2.5 V

    ClassA;Grid1Control

  • Plate Current

    8 mA

    ClassA;Grid1Control

  • Screen Current

    15 mA

    ClassA;Grid1Control

  • Grid No.3 Control Transconductance

    350 uS

    ClassA;Grid1Control

  • Alternate Plate Current

    7.6 mA

    ClassA;Grid3Control

  • Alternate Screen Current

    14.5 mA

    ClassA;Grid3Control

Capacitance

  • Plate-to-All-Other-Electrodes Capacitance

    3.7 pF

    EachUnit

  • Grid No.1-to-All-Other-Electrodes Capacitance

    15.5 pF

    EachUnit

  • Grid No.3-to-All-Other-Electrodes Capacitance

    6 pF

    EachUnit

  • Grid No.3-to-Plate Capacitance

    2.7 pF

    EachUnit

  • Grid No.3 Unit-to-Unit Capacitance

    0.1 pF

    BetweenUnits