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Voltage Dual Pentode ·Pentode-Pentode

6HS8

Twin pentode designed for television AGC, sync separation, sync clipping, and noise-limiting circuits in color and monochrome receivers.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
9FC
Socket code
B9A
Base pins
9
Nominal heater
6.3 V / 300 mA

Description

Miniature type used in age amplifier, sync, and noise- limiting circuits of color and black-and-white television receivers. One pentode unit is used as combined sync separator and sync clipper; second pentode unit is used as age amplifier. Outlines section, 6E; requires miniature 9-contact socket. Types 3HS8 and 4HS8 are identical with type 6HS8 except for heater ratings.

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
9FC
Socket code
B9A
Base pins
9
Nominal heater voltage
6.3 V
Nominal heater current
300 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

9FC - 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
4600 Ω
Transconductance
0.0011 S
Amplification factor
300
Max plate voltage
300 V
Max screen voltage
150 V
Max plate dissipation
1.1 W
Max screen dissipation
0.75 W
Max cathode current
12 mA

Each equal section; shared control/screen/cathode structure.

Section 2

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
4600 Ω
Transconductance
0.0011 S
Amplification factor
300
Max plate voltage
300 V
Max screen voltage
150 V
Max plate dissipation
1.1 W
Max screen dissipation
0.75 W
Max cathode current
12 mA

Second physical pentode section; electrically identical twin 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

  • Plate Voltage

    100 V

    Published operating/characteristic table

  • Screen Voltage

    67.5 V

    Published operating/characteristic table

  • Grid Voltage

    1 V

    Published operating/characteristic table

Data set 02

1965 Westinghouse Data Book

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Heater Voltage

    6.3 V

  • Heater Current

    300 mA

Other

  • Maximum Plate Voltage

    300 V

  • Maximum Plate Dissipation

    1.1 W

  • Maximum Grid3 Positive Voltage

    3 V

  • Maximum Grid3 Negative Voltage

    -50 V

  • Maximum Screen Voltage

    150 V

  • Maximum Screen Dissipation

    0.75 W

  • Plate Voltage

    100 V

  • Screen Voltage

    67.5 V

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 3 to plate capacitance

    2 pF

  • Grid 1 total capacitance

    6 pF

  • Grid 3 total capacitance

    3.6 pF

  • Plate total capacitance

    3 pF

Other

  • Plate voltage

    200 V

    EachSectionSeparately

  • Screen voltage

    67.5 V

    EachSectionSeparately

  • Plate current

    2 mA

    EachSectionSeparately

Characteristics

  • Grid 3 transconductance

    450 µS

    EachSectionSeparately

  • Grid 1 transconductance

    1100 µS

    EachSectionSeparately

Data set 04

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Voltage (AC or DC)

    6.3 V

    Published table value column 1

  • Voltage (AC or DC)

    0.6 V

    Published table value column 2

  • Current at heater volts =

    6.3 V

    Published table value column 1

  • Current at heater volts =

    0.3 V

    Published table value column 2

  • respect to cathode

    200 V

    Published table value

  • Grid No

    3 pF

    Published table value column 1

  • Grid No

    2 pF

    Published table value column 2

  • Grid No.l to all other electrodes

    6 pF

    Published table value

  • Plate Voltage

    100 V

    Published table value column 1

  • Plate Voltage

    100 V

    Published table value column 2

  • Grid-No

    3 V

    Published table value column 1

  • Grid-No

    0 V

    Published table value column 2

  • Grid-No

    0 V

    Published table value column 3

  • Grid-No

    2 V

    Published table value column 1

  • Grid-No

    67 V

    Published table value column 2

  • Grid-No

    5 V

    Published table value column 3

  • Grid-No

    67.5 V

    Published table value column 4

  • Grid-No.l Voltage

    0 V

    Published table value

  • Grid-No

    3 µS

    Published table value column 1

  • Grid-No

    450 µS

    Published table value column 2

  • Plate Current

    2 mA

    Published table value

  • plate µa =

    100 V

    Published table value column 1

  • plate µa =

    -3.5 V

    Published table value column 2

  • plate µa =

    -2.3 V

    Published table value column 2

  • Plate Voltage (Each unit)

    100 V

    Published table value column 1

  • Plate Voltage (Each unit)

    100 V

    Published table value column 2

  • Grid-No

    -10 V

    Published table value column 2

  • Plate Current (Each unit)

    2 mA

    Published table value

  • Grid-No

    2 mA

    Published table value column 1

  • Grid-No

    7 mA

    Published table value column 2

  • Grid-No

    4.4 mA

    Published table value column 3

  • Cathode Current

    7 mA

    Published table value column 1

  • Cathode Current

    1 mA

    Published table value column 2

  • Cathode Current

    8.5 mA

    Published table value column 3

  • PLATE VOLTAGE (Each unit)

    300 V

    Published table value

  • GRID-No

    2 V

    Published table value column 1

  • GRID-No

    150 V

    Published table value column 2

  • CATHODE CURRENT

    12 mA

    Published table value

Characteristics

  • Grid-No.l-to-Plate Transconductance

    1100 µS

    Published table value

Data set 05

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Heater Warm-up Time (Average)

    11 seconds

    Heater Warm-up Time (Average) 11 11 seconds

  • Plate Dissipation (Each Unit)

    1.1 watts

    Plate Dissipation (Each Unit) 1.1 watts

  • Grid-No

    0.75 watt

    Grid-No. 2 Input 0.75 watt

  • • With plate and grid No

    3

    • With plate and grid No.3 of other unit connected to ground.

  • Grid No

    2

    Grid No.2 (Beam Plate) Connected to cathode at socket

Capacitance

  • Grid No

    2 pF

    Grid No.3 to Plate (Each Unit) 2 pF

  • Grid No.l to All Other Electrodes

    6 pF

    Grid No.l to All Other Electrodes 6 pF

  • Grid No

    3.6 pF

    Grid No.3 (Each Unit) to All Other Electrodes 3.6 pF

  • Grid No

    2 pF

    Grid No.3 (Unit No.l) to Grid No.3 (Unit No.2) pF

Characteristic

  • Plate Voltage (Each Unit)

    300 volts

    Plate Voltage (Each Unit) 300 volts

  • Grid-No

    3

    Grid-No.3 (Suppressor-Grid) Voltage (Each Unit) :

  • Grid-No

    150 volts

    Grid-No.2 (Screen-Grid) Voltage 150 volts

  • Grid-No.l (Control-Grid) Voltage, Negative-bias value

    50 volts

    Grid-No.l (Control-Grid) Voltage, Negative-bias value . . . 50 volts

  • Cathode Current

    12 mA

    Cathode Current 12 mA

  • Plate Voltage

    100 volts

    Plate Voltage 100 100 volts

  • Grid-No

    0 volts

    Grid-No.3 Voltage 0 0 volts

  • Grid-No

    67.5 volts

    Grid-No 2 Voltage 67.5 67.5 volts

  • Grid-No.l Voltage

    0 volts

    Grid-No.l Voltage 0 volts

  • Transconductance, Grid No

    450

    Transconductance, Grid No.3 to Plate 450 /i mhos

  • Transconductance, Grid No.l to Plate

    1100

    Transconductance, Grid No.l to Plate 1100 /imhos

  • Plate Current

    2 mA

    Plate Current 2 mA

  • Grid-No

    3

    Grid-No.3 Voltage (Approx.) plate current of

  • Grid-No

    1

    Grid-No 1 Voltage (Approx.) plate current of

  • Grid-No

    3

    Grid-No.3 Voltage (Each Unit)

  • Grid-No

    2

    Grid-No.2 Voltage

  • Plate Current (Each Unit)

    2 mA

    Plate Current (Each Unit) - 2 mA

  • Grid-No

    4.4 mA

    Grid-No.2 Current 7 4.4 mA

  • Cathode Current

    8.5 mA

    Cathode Current 7.1 8.5 mA

  • Grid-No.S-Circuit Resistance (Each Unit)

    0.5 megohm

    Grid-No.S-Circuit Resistance (Each Unit) 0.5 megohm

  • Grid-No.l-Circuit Resistance

    0.5 megohm

    Grid-No.l-Circuit Resistance 0.5 megohm

  • • Adjusted to give grid-No.l current of

    0.1

    • Adjusted to give grid-No.l current of 0.1 milliampere.

  • Pulse Plate Voltage*

    3500 volts

    Pulse Plate Voltage* 3500 volts

  • Grid-Voltage, Negative-bias value

    4.4 volts

    Grid-Voltage, Negative-bias value +200 4.4 volts

  • Peak Plate Current

    300 mA

    Peak Plate Current 300 mA

  • Amplification Factor

    300

    Amplification Factor 300

  • Transconductance

    65000

    Transconductance 65000 /xmhos

  • Plate Resistance (Approx.)

    4600 ohms

    Plate Resistance (Approx.) 4600 ohms

  • Grid Voltage (Approx.) for plate current of

    13 mA

    Grid Voltage (Approx.) for plate current of 1 mA - 13 volts

  • Peak Plate Voltage*

    5500 volts

    Peak Plate Voltage* 5500 volts