Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Voltage Triode Tetrode ·Tetrode-Triode

6FH8

Medium-mu triode plus sharp-cutoff tetrode with auxiliary plates for complex-wave-generator and television-receiver applications.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
9KP
Socket code
B9A
Base pins
9
Nominal heater
6.3 V / 450 mA

Description

Medium-mu triode plus sharp-cutoff tetrode with auxiliary plates, intended for complex-wave-generator and television-receiver 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
9KP
Socket code
B9A
Base pins
9
Nominal heater voltage
6.3 V
Nominal heater current
450 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

9KP - Terminal pinout

Electrical assignments shared by every tube using this base designation.

TerminalSectionConnectionEvidence
PIN1Base PinAP — Plate (Anode)

Original chart label 1P3; manufacturer confirmation pending

Unverified

EIA Base Connections printed p133, 9KP

PIN2Base PinBG1 — Control Grid

Original chart label 2G1; manufacturer confirmation pending

Unverified

EIA Base Connections printed p133, 9KP

PIN3Base PinBP — Plate (Anode)

Original chart label 2P; manufacturer confirmation pending

Unverified

EIA Base Connections printed p133, 9KP

PIN4Base Pin—H — HeaterGroup 9KP4

Original chart label H; manufacturer confirmation pending

Unverified

EIA Base Connections printed p133, 9KP

PIN4Base Pin—K — CathodeGroup 9KP4

Original chart label K; manufacturer confirmation pending

Unverified

EIA Base Connections printed p133, 9KP

PIN5Base Pin—H — Heater

Original chart label H; manufacturer confirmation pending

Unverified

EIA Base Connections printed p133, 9KP

PIN6Base PinAG1 — Control Grid

Original chart label 1G1; manufacturer confirmation pending

Unverified

EIA Base Connections printed p133, 9KP

PIN7Base PinAG2 — Screen Grid

Original chart label 1G2; manufacturer confirmation pending

Unverified

EIA Base Connections printed p133, 9KP

PIN8Base PinAP — Plate (Anode)

Original chart label 1P2; manufacturer confirmation pending

Unverified

EIA Base Connections printed p133, 9KP

PIN9Base PinAP — Plate (Anode)

Original chart label 1P1; manufacturer confirmation pending

Unverified

EIA Base Connections printed p133, 9KP

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
7400 Ω
Transconductance
0.0054 S
Amplification factor
40
Max plate voltage
250 V
Max plate dissipation
2.5 W

Published maximum ratings and characteristic values promoted where applicable; additional values retained in TUBE_SECTION_PARAMETER.

Section 2

Tetrode

X-ray radiationInterelectrode capacitances
Plate resistance
750000 Ω
Transconductance
0.0044 S
Max plate voltage
250 V
Max screen voltage
150 V
Max plate dissipation
2.5 W
Max screen dissipation
0.5 W

Published maximum ratings and characteristic values promoted where applicable; additional values retained in TUBE_SECTION_PARAMETER.

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

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Plate_voltage

    100 V

    ClassA

  • Grid_voltage

    -1 V

    ClassA

Characteristic

  • Plate_current

    7.9 mA

    ClassA

Capacitance

  • Grid-to-plate capacitance

    1.4 pF

  • Input capacitance

    2.6 pF

  • Output capacitance

    1 pF

SECTION 2

Tetrode

Other

  • Maximum_plate_2_voltage

    200 V

  • Maximum_plate_3_voltage

    200 V

  • Maximum_plate_2_dissipation

    0.3 W

  • Maximum_plate_3_dissipation

    0.3 W

  • Plate_1_voltage

    250 V

    HarmonicGenerator

  • Screen_voltage

    250 V

    HarmonicGenerator

  • Grid_1_voltage

    -2 V

    HarmonicGenerator

Characteristic

  • Plate_1_current

    4.3 mA

    HarmonicGenerator

  • Screen_current

    2.4 mA

    HarmonicGenerator

Capacitance

  • Grid-1-to-plate-1 capacitance maximum

    0.06 pF

  • Plate-1 output capacitance

    1.4 pF

Data set 02

1971 RCA HB3 Binder 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Plate voltage

    100 V

    ClassA

  • Plate current

    7.9 mA

    ClassA

  • Maximum plate voltage

    275 V

  • Grid No.l to plate No.l

    0 mA

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • PLATE VOLTAGE

    275 V

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • PLATE-No.l VOLTAGE

    275 V

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • PLATE-No.2 VOLTAGE

    200 V

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • SUPPLY VOLTAGE

    275 V

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Negative-bias value — published value 1

    40 V

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Negative-bias value — published value 2

    40 V

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Positive-bias value — published value 1

    0 V

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Positive-bias value — published value 2

    0 V

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • PLATE DISSIPATION

    1.7 mA

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • PLATE-No.1 DISSIPATION

    2.3 mA

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • PLATE-No.2 DISSfPATION

    0.3 mA

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • PLATE-No.3 DISSIPATION

    0.3 mA

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

Characteristics

  • Plate resistance

    7400 ohm

    ClassA

  • Transconductance

    5400 uS

    ClassA

  • Amplification factor

    40

    ClassA

  • Voltage (AC or DC) — published value 1

    6.3 V

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Voltage (AC or DC) — published value 2

    10 V

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Current — published value 1

    0 mA

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Current — published value 2

    45 A

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Grid to plate

    1.4

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Grid to cathode & heater

    2.6

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Plate to cathode 6 heater — published value 1

    6

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Plate to cathode 6 heater — published value 2

    1

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • plate No.3, plate No. 2,

    2

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • and grid No.2

    4.5

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • and grid No.2

    1.4

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Plate Voltage

    100 V

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Grid Voltage

    -1 V

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Amplification Factor

    40 A

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Plate Resistance (Approx )

    7400 ohm

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Transconductance

    5400

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • /~ Plate Current

    7.9 mA

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • 4 Grid Voltage (Approx.) for plate

    4 V

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Plate-No.l Voltage

    250 V

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Grid-No.2 Voltage

    250 V

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Grid-No.1 Voltage

    -2 V

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Plate-No.l Resistance (Approx.) — published value 1

    0 Mohm

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Plate-No.l Resistance (Approx.) — published value 2

    75 Mohm

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • to Plate No.1

    4400

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Plate-No.l Current

    7.3 mA

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Grid-No.2 Current

    1.4 mA

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Pin 3 -Triode Plate

    3

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • 275 volts

    275 V

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Plates—No.l, No.2, and No.3 Voltage

    100 V

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Grid—No.2 Voltage

    50 V

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Grid—No.1.Voltage

    1 V

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Plate—No.l Current

    1.6 mA

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Plate—No.2 Current — published value 1

    0 mA

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Plate—No.2 Current — published value 2

    4 mA

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Grid—No.2 Current

    0.3 mA

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Grid No.l to plate No.l

    2500

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Grid No.l to plate No.3

    70

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

SECTION 2

Tetrode

Other

  • Plate voltage

    250 V

    ClassA

  • Maximum plate voltage

    330 V

  • Maximum screen-grid voltage

    330 V

  • Tetrode grid No.l to triode plate

    0.35 mA

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Tetrode plate No.i to triode plate

    0.008 mA

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

Characteristics

  • Pin 2 -Triode Grid — published value 1

    2

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Pin 2 -Triode Grid — published value 2

    1

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Pin 2 -Triode Grid — published value 3

    7

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Pin 4 -Heater,

    4

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Pin 5 -Heater — published value 1

    5

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Pin 5 -Heater — published value 2

    9

    Published datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

Data set 03

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Grid Voltage (Approx.) for plate current of 100 /iA

    -5.5 V

    Published in approved 6FH8 target entry; Section1

  • Grid-Circuit Resistance, for cathode-bias operation

    1 MΩ

    Published in approved 6FH8 target entry; Section1

  • Heater Voltage (ac/dc)

    6.3 V

    Published in approved 6FH8 target entry; Section1

  • Heater Current

    450 mA

    Published in approved 6FH8 target entry; Section1

  • Plate-No.2 Voltage

    250 V

    Published in approved 6FH8 target entry; Section1

  • Grid-No.2 Voltage

    250 V

    Published in approved 6FH8 target entry; Section1

  • Grid-No.l Voltage

    2 V

    Published in approved 6FH8 target entry; Section1

  • Plate-No.2 Resistance (Approx.)

    0.75 MΩ

    Published in approved 6FH8 target entry; Section1

  • Transconductance, Grid No.l to Plate No.2

    4400 µS

    Published in approved 6FH8 target entry; Section1

  • Plate-No.2 Current

    7.3 mA

    Published in approved 6FH8 target entry; Section1

  • Grid-No.2 Current

    1.4 mA

    Published in approved 6FH8 target entry; Section1

  • Plate-No.lA Voltage

    200 V

    Published in approved 6FH8 target entry; Section1

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

    275 V

    Published in approved 6FH8 target entry; Section1

  • Negative-bias value — 40

    -40 V

    Published in approved 6FH8 target entry; Section1

  • Plate Dissipation 1.7

    0 W

    Published in approved 6FH8 target entry; Section1

  • Plate-No.lA Dissipation

    0.3 W

    Published in approved 6FH8 target entry; Section1

  • Plate-No.lB Dissipation

    0.3 W

    Published in approved 6FH8 target entry; Section1

  • Plate-No.2 Dissipation

    2.3 W

    Published in approved 6FH8 target entry; Section1

  • For grid-No.2 voltages up to

    137.6 V

    Published in approved 6FH8 target entry; Section1

  • For grid-No.2 voltages up to 137.6 volts

    0.45 W

    Published in approved 6FH8 target entry; Section1

  • For grid-No.2 voltages between 137.5 and

    275 V

    Published in approved 6FH8 target entry; Section1

  • Plates-No.lA, No.lB, and No.2 Voltage

    100 V

    Published in approved 6FH8 target entry; Section1

  • Grid-No.2 Voltage

    50 V

    Published in approved 6FH8 target entry; Section1

  • Grid-No. 1 Voltage

    -1 V

    Published in approved 6FH8 target entry; Section1

  • Plate-No.lA Current

    0.04 mA

    Published in approved 6FH8 target entry; Section1

  • Plate-No.lB Current

    0.04 mA

    Published in approved 6FH8 target entry; Section1

  • Plate-No.2 Current

    1.6 mA

    Published in approved 6FH8 target entry; Section1

  • Grid-No.2 Current

    0.3 mA

    Published in approved 6FH8 target entry; Section1

  • Grid No.l to Plate No.lA

    70 µS

    Published in approved 6FH8 target entry; Section1

  • Grid No.l to Plate No.lB

    70 µS

    Published in approved 6FH8 target entry; Section1

  • Grid No.l to Plate No.2

    2500 µS

    Published in approved 6FH8 target entry; Section1

  • Grid-No.l-Circuit Resistance, for fixed-bias operation 0.5

    0.5 MΩ

    Published in approved 6FH8 target entry; Section1

Capacitance

  • Grid to Plate

    1.4 pF

    Published in approved 6FH8 target entry; Section1

  • Plate No.lB

    4.6 pF

    Published in approved 6FH8 target entry; Section1

Characteristic

  • Plate Voltage

    100 V

    Published in approved 6FH8 target entry; Section1

  • Grid Voltage

    1 V

    Published in approved 6FH8 target entry; Section1

  • Plate Resistance (Approx.)

    7400 Ω

    Published in approved 6FH8 target entry; Section1

  • Plate Current

    7.9 mA

    Published in approved 6FH8 target entry; Section1

SECTION 2

Tetrode

Other

  • Grid Voltage (Approx.) for plate current of 100 /iA

    -5.5 V

    Published in approved 6FH8 target entry; Section2

  • Grid-Circuit Resistance, for cathode-bias operation

    1 MΩ

    Published in approved 6FH8 target entry; Section2

  • Heater Voltage (ac/dc)

    6.3 V

    Published in approved 6FH8 target entry; Section2

  • Heater Current

    450 mA

    Published in approved 6FH8 target entry; Section2

  • Plate-No.2 Voltage

    250 V

    Published in approved 6FH8 target entry; Section2

  • Grid-No.2 Voltage

    250 V

    Published in approved 6FH8 target entry; Section2

  • Grid-No.l Voltage

    2 V

    Published in approved 6FH8 target entry; Section2

  • Plate-No.2 Resistance (Approx.)

    0.75 MΩ

    Published in approved 6FH8 target entry; Section2

  • Transconductance, Grid No.l to Plate No.2

    4400 µS

    Published in approved 6FH8 target entry; Section2

  • Plate-No.2 Current

    7.3 mA

    Published in approved 6FH8 target entry; Section2

  • Grid-No.2 Current

    1.4 mA

    Published in approved 6FH8 target entry; Section2

  • Plate-No.lA Voltage

    200 V

    Published in approved 6FH8 target entry; Section2

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

    275 V

    Published in approved 6FH8 target entry; Section2

  • Negative-bias value — 40

    -40 V

    Published in approved 6FH8 target entry; Section2

  • Plate Dissipation 1.7

    0 W

    Published in approved 6FH8 target entry; Section2

  • Plate-No.lA Dissipation

    0.3 W

    Published in approved 6FH8 target entry; Section2

  • Plate-No.lB Dissipation

    0.3 W

    Published in approved 6FH8 target entry; Section2

  • Plate-No.2 Dissipation

    2.3 W

    Published in approved 6FH8 target entry; Section2

  • For grid-No.2 voltages up to

    137.6 V

    Published in approved 6FH8 target entry; Section2

  • For grid-No.2 voltages up to 137.6 volts

    0.45 W

    Published in approved 6FH8 target entry; Section2

  • For grid-No.2 voltages between 137.5 and

    275 V

    Published in approved 6FH8 target entry; Section2

  • Plates-No.lA, No.lB, and No.2 Voltage

    100 V

    Published in approved 6FH8 target entry; Section2

  • Grid-No.2 Voltage

    50 V

    Published in approved 6FH8 target entry; Section2

  • Grid-No. 1 Voltage

    -1 V

    Published in approved 6FH8 target entry; Section2

  • Plate-No.lA Current

    0.04 mA

    Published in approved 6FH8 target entry; Section2

  • Plate-No.lB Current

    0.04 mA

    Published in approved 6FH8 target entry; Section2

  • Plate-No.2 Current

    1.6 mA

    Published in approved 6FH8 target entry; Section2

  • Grid-No.2 Current

    0.3 mA

    Published in approved 6FH8 target entry; Section2

  • Grid No.l to Plate No.lA

    70 µS

    Published in approved 6FH8 target entry; Section2

  • Grid No.l to Plate No.lB

    70 µS

    Published in approved 6FH8 target entry; Section2

  • Grid No.l to Plate No.2

    2500 µS

    Published in approved 6FH8 target entry; Section2

  • Grid-No.l-Circuit Resistance, for fixed-bias operation 0.5

    0.5 MΩ

    Published in approved 6FH8 target entry; Section2

Capacitance

  • Grid to Plate

    1.4 pF

    Published in approved 6FH8 target entry; Section2

  • Plate No.lB

    4.6 pF

    Published in approved 6FH8 target entry; Section2

Characteristic

  • Plate Voltage

    100 V

    Published in approved 6FH8 target entry; Section2

  • Grid Voltage

    1 V

    Published in approved 6FH8 target entry; Section2

  • Plate Resistance (Approx.)

    7400 Ω

    Published in approved 6FH8 target entry; Section2

  • Plate Current

    7.9 mA

    Published in approved 6FH8 target entry; Section2