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Voltage Triode Pentode ·Pentode-Triode

6KT8

High-mu triode plus sharp-cutoff pentode used in television IF, sync-separator, and voltage-amplifier applications.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
9QP
Socket code
B9A
Base pins
9
Nominal heater
6.3 V / 600 mA

Description

High-mu triode plus sharp-cutoff pentode used in television IF, sync-separator, and voltage-amplifier applications.

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

9QP - 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
150000 Ω
Transconductance
0.01 S
Max plate voltage
330 V
Max screen voltage
330 V
Max plate dissipation
2.5 W
Max screen dissipation
0.55 W

Representative electrical section from supplied RCA data sheet.

Section 2

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
31500 Ω
Transconductance
0.0032 S
Amplification factor
100
Max plate voltage
330 V
Max plate dissipation
1 W

Representative electrical section from supplied RCA data sheet.

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

1965 Westinghouse Data Book

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Maximum Plate Voltage

    330 V

  • Maximum Plate Dissipation

    2.5 W

  • Maximum Screen Supply Voltage

    330 V

Characteristics

  • Grid-Plate Capacitance

    0.03 pF

    ShieldedOrMaximum

  • Input Capacitance

    1.5 pF

  • Output Capacitance

    2.8 pF

SECTION 2

Triode

Characteristics

  • Heater Voltage

    6.3 V

  • Heater Current

    600 mA

  • Amplification Factor

    100 ratio

  • Grid-Plate Capacitance

    3 pF

Other

  • Maximum Plate Voltage

    330 V

  • Maximum Plate Dissipation

    1 W

Data set 02

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Maximum Plate Voltage

    330 V

  • Maximum Screen Supply Voltage

    330 V

  • Maximum Plate Dissipation

    2.5 W

  • Maximum Screen Dissipation

    0.55 W

  • Typical Plate Voltage

    125 V

  • Typical Screen Voltage

    125 V

  • Typical Grid1 Voltage

    -1 V

  • Typical Plate Current

    12 mA

  • Typical Screen Current

    4.5 mA

Characteristic

  • Plate Resistance

    150000 ohm

  • Transconductance

    10000 uS

SECTION 2

Triode

Other

  • Maximum Plate Voltage

    330 V

  • Maximum Plate Dissipation

    1 W

  • Typical Plate Voltage

    250 V

  • TypicalGridVoltage

    -2 V

  • Typical Plate Current

    1.8 mA

Characteristic

  • Amplification Factor

    100

  • Plate Resistance

    31500 ohm

  • Transconductance

    3200 uS

Data set 03

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

    600 mA

  • Plate Voltage

    330 V

    Published source row

  • Plate Voltage (value 2)

    330 V

    Published source row

  • Grid-No

    2 V

    Published source row

  • Grid-No (value 2)

    330 V

    Published source row

  • Grid-No

    2 A

    Published source row

  • Grid-No

    1

    Published source row

  • Grid-No

    2

    Published source row

  • For grid-No

    2

    Published source row

  • For grid-No

    2

    Published source row

  • Plate Dissipation

    1 W

    Published source row

  • Plate Dissipation (value 2)

    2.5 W

    Published source row

  • No

    3

    Published source row

  • No (value 2)

    20

    Published source row

Characteristics

  • Voltage (AC or DC)

    0.6 V

    Published table column

  • Current at heater volts =

    0 V

    Published table column

Capacitance

  • Plate Voltage

    250 V

    Published source row

  • Plate Voltage (value 2)

    125 V

    Published source row

  • Grid-No

    2 V

    Published source row

  • Grid-No (value 2)

    125 V

    Published source row

  • Grid-No

    1 V

    Published source row

  • Grid-No (value 2)

    -2 V

    Published source row

  • Grid-No (value 3)

    -1 V

    Published source row

  • Plate Resistance (Approx )

    31500 ohm

    Published source row

  • Plate Resistance (Approx ) (value 2)

    150000 ohm

    Published source row

  • Transconductance

    3200 µS

    Published source row

  • Transconductance (value 2)

    10000 µS

    Published source row

  • Plate Current

    1.8 mA

    Published source row

  • Plate Current (value 2)

    12 mA

    Published source row

  • Grid-No

    2 mA

    Published source row

  • Grid-No (value 2)

    4.5 mA

    Published source row

  • Grid-No

    1

    Published source row

SECTION 2

Triode

Other

  • Heater voltage nominal

    6.3 V

  • Heater current

    600 mA

  • Maximum plate voltage

    330 V

    Promoted field corroboration

  • Maximum plate dissipation

    1 W

    Promoted field corroboration

Characteristics

  • Voltage (AC or DC)

    6.3 V

    Published table column

  • Current at heater volts =

    6.3 V

    Published table column

  • Plate resistance

    31500 ohm

    Promoted field corroboration

  • Transconductance

    3200 µS

    Promoted field corroboration

Data set 04

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • Plate Supply Voltage 125

    170 V

    Published in approved 6KT8 target datasheet entry; Section2

  • Grid-No.3 Voltage 0

    0 V

    Published in approved 6KT8 target datasheet entry; Section2

  • Grid-No.2 Supply Voltage 125

    170 V

    Published in approved 6KT8 target datasheet entry; Section2

  • Cathode-Bias Resistor 56

    56 Ω

    Published in approved 6KT8 target datasheet entry; Section2

  • Plate Current

    17 mA

    Published in approved 6KT8 target datasheet entry; Section2

  • of 10 jurahos —

    22 V

    Published in approved 6KT8 target datasheet entry; Section2

  • Grid-No. 1 Voltage —2

    -1 V

    Published in approved 6KT8 target datasheet entry; Section2

  • Plate Resistance (Approx.) 31500

    150000 Ω

    Published in approved 6KT8 target datasheet entry; Section2

  • Transconductance 3200

    10000 µS

    Published in approved 6KT8 target datasheet entry; Section2

  • Plate Current 1.8

    12 mA

    Published in approved 6KT8 target datasheet entry; Section2

  • Grid-No.2 Current

    4.5 mA

    Published in approved 6KT8 target datasheet entry; Section2

  • 20 M —3.5

    -7 V

    Published in approved 6KT8 target datasheet entry; Section2

Other

  • Heater Voltage (ac/dc)

    6.3 V

    Published in approved 6KT8 target datasheet entry; Section2

  • Heater Current 0

    -6 A

    Published in approved 6KT8 target datasheet entry; Section2

  • Plate Voltage 330

    330 V

    Published in approved 6KT8 target datasheet entry; Section2

  • Grid-No.2 (Screen-Grid) Supply Voltage

    330 V

    Published in approved 6KT8 target datasheet entry; Section2

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

    0 V

    Published in approved 6KT8 target datasheet entry; Section2

  • Plate Dissipation

    2.5 W

    Published in approved 6KT8 target datasheet entry; Section2

  • For grid-No.2 voltages up to

    165 V

    Published in approved 6KT8 target datasheet entry; Section2

  • For grid-No.2 voltages between 165 and

    330 V

    Published in approved 6KT8 target datasheet entry; Section2

  • Plate Voltage 250

    125 V

    Published in approved 6KT8 target datasheet entry; Section2

  • Grid-No. 2 Voltage

    125 V

    Published in approved 6KT8 target datasheet entry; Section2

  • For fixed-bias operation 0.5

    0.5 MΩ

    Published in approved 6KT8 target datasheet entry; Section2

  • For cathode-bias operation 1

    1 MΩ

    Published in approved 6KT8 target datasheet entry; Section2

Capacitance

  • Grid to Plate 3

    3 pF

    Published in approved 6KT8 target datasheet entry; Section2

  • Pentode Unit, and Internal Shield 3.2

    3.2 pF

    Published in approved 6KT8 target datasheet entry; Section2

  • Peniode Unit, and Internal Shield 1.6

    2.4 pF

    Published in approved 6KT8 target datasheet entry; Section2

  • Grid No.3, and Internal Shield 7.5

    7.5 pF

    Published in approved 6KT8 target datasheet entry; Section2

  • Grid No.3, and Internal Shield 2.2

    2.8 pF

    Published in approved 6KT8 target datasheet entry; Section2

SECTION 2

Triode

Characteristic

  • Plate Supply Voltage 125

    170 V

    Published in approved 6KT8 target datasheet entry; Section1

  • Grid-No.3 Voltage 0

    0 V

    Published in approved 6KT8 target datasheet entry; Section1

  • Grid-No.2 Supply Voltage 125

    170 V

    Published in approved 6KT8 target datasheet entry; Section1

  • Cathode-Bias Resistor 56

    56 Ω

    Published in approved 6KT8 target datasheet entry; Section1

  • Plate Current

    17 mA

    Published in approved 6KT8 target datasheet entry; Section1

  • of 10 jurahos —

    22 V

    Published in approved 6KT8 target datasheet entry; Section1

  • Grid-No. 1 Voltage —2

    -1 V

    Published in approved 6KT8 target datasheet entry; Section1

  • Plate Resistance (Approx.) 31500

    150000 Ω

    Published in approved 6KT8 target datasheet entry; Section1

  • Transconductance 3200

    10000 µS

    Published in approved 6KT8 target datasheet entry; Section1

  • Plate Current 1.8

    12 mA

    Published in approved 6KT8 target datasheet entry; Section1

  • Grid-No.2 Current

    4.5 mA

    Published in approved 6KT8 target datasheet entry; Section1

  • 20 M —3.5

    -7 V

    Published in approved 6KT8 target datasheet entry; Section1

Other

  • Heater Voltage (ac/dc)

    6.3 V

    Published in approved 6KT8 target datasheet entry; Section1

  • Heater Current 0

    -6 A

    Published in approved 6KT8 target datasheet entry; Section1

  • Plate Voltage 330

    330 V

    Published in approved 6KT8 target datasheet entry; Section1

  • Grid-No.2 (Screen-Grid) Supply Voltage

    330 V

    Published in approved 6KT8 target datasheet entry; Section1

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

    0 V

    Published in approved 6KT8 target datasheet entry; Section1

  • Plate Dissipation

    2.5 W

    Published in approved 6KT8 target datasheet entry; Section1

  • For grid-No.2 voltages up to

    165 V

    Published in approved 6KT8 target datasheet entry; Section1

  • For grid-No.2 voltages between 165 and

    330 V

    Published in approved 6KT8 target datasheet entry; Section1

  • Plate Voltage 250

    125 V

    Published in approved 6KT8 target datasheet entry; Section1

  • Grid-No. 2 Voltage

    125 V

    Published in approved 6KT8 target datasheet entry; Section1

  • For fixed-bias operation 0.5

    0.5 MΩ

    Published in approved 6KT8 target datasheet entry; Section1

  • For cathode-bias operation 1

    1 MΩ

    Published in approved 6KT8 target datasheet entry; Section1

Capacitance

  • Grid to Plate 3

    3 pF

    Published in approved 6KT8 target datasheet entry; Section1

  • Pentode Unit, and Internal Shield 3.2

    3.2 pF

    Published in approved 6KT8 target datasheet entry; Section1

  • Peniode Unit, and Internal Shield 1.6

    2.4 pF

    Published in approved 6KT8 target datasheet entry; Section1

  • Grid No.3, and Internal Shield 7.5

    7.5 pF

    Published in approved 6KT8 target datasheet entry; Section1

  • Grid No.3, and Internal Shield 2.2

    2.8 pF

    Published in approved 6KT8 target datasheet entry; Section1