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Voltage Pentode or Tetrode (with diode) ·Diode-Pentode

6HJ8

Television diode-pentode combining a video-detector diode with a high-transconductance sharp-cutoff pentode for IF amplification, integrating picture-signal detection and wideband IF gain.

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

Description

The 6HJ8 combines a video-detector diode with a sharp-cutoff pentode designed for IF amplifier service in television receivers; the two sections have separate cathodes.

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
9CY
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

9CY - Terminal pinout

Electrical assignments shared by every tube using this base designation.

TerminalSectionConnectionEvidence
PIN11KAK — Cathode

Original EIA label 1K; manufacturer corroboration pending

Unverified

EIA Base Connections, printed page 131, 9CY

PIN21G1AG1 — Control Grid

Original EIA label 1G1; manufacturer corroboration pending

Unverified

EIA Base Connections, printed page 131, 9CY

PIN31G2AG2 — Screen Grid

Original EIA label 1G2; manufacturer corroboration pending

Unverified

EIA Base Connections, printed page 131, 9CY

PIN4H—H — Heater

Original EIA label H; manufacturer corroboration pending

Unverified

EIA Base Connections, printed page 131, 9CY

PIN5H—H — Heater

Original EIA label H; manufacturer corroboration pending

Unverified

EIA Base Connections, printed page 131, 9CY

PIN61PAP — Plate (Anode)

Original EIA label 1P; manufacturer corroboration pending

Unverified

EIA Base Connections, printed page 131, 9CY

PIN72KBK — Cathode

Original EIA label 2K; manufacturer corroboration pending

Unverified

EIA Base Connections, printed page 131, 9CY

PIN82PBP — Plate (Anode)

Original EIA label 2P; manufacturer corroboration pending

Unverified

EIA Base Connections, printed page 131, 9CY

PIN91G3AG3 — Suppressor Grid

Original EIA label 1G3; manufacturer corroboration pending

Unverified

EIA Base Connections, printed page 131, 9CY

Section ratings

2 physical sections, each with unique specifications.

Section 1

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

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

Section 2

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
200000 Ω
Transconductance
0.0093 S
Max plate voltage
330 V
Max screen voltage
330 V
Max plate dissipation
3.2 W
Max screen dissipation
0.55 W

Published maximum ratings and characteristic values promoted where applicable; additional table 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

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Diode

Other

  • PlateVoltageTypical

    330 V

    Published operating/characteristic value

  • PlateCurrentTypical

    11.5 mA

    Published operating/characteristic value

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Diode

Other

  • Plate Voltage

    330 V

    Published operating/characteristic table

  • Screen Voltage

    2 V

    Published operating/characteristic table

  • Grid Voltage

    1 V

    Published operating/characteristic table

  • Cathode Resistor

    56 ohm

    Published operating/characteristic table

Characteristic

  • Plate Current

    11.5 mA

    Published operating/characteristic table

  • Screen Current

    3.6 mA

    Published operating/characteristic table

  • Transconductance

    9300 uS

    Published operating/characteristic table

  • Plate Resistance

    0.2 ohm

    Published operating/characteristic table

SECTION 2

Pentode

Other

  • Plate Voltage

    330 V

    Published operating/characteristic table

  • Screen Voltage

    2 V

    Published operating/characteristic table

  • Grid Voltage

    1 V

    Published operating/characteristic table

  • Cathode Resistor

    56 ohm

    Published operating/characteristic table

Characteristic

  • Plate Current

    11.5 mA

    Published operating/characteristic table

  • Screen Current

    3.6 mA

    Published operating/characteristic table

  • Transconductance

    9300 uS

    Published operating/characteristic table

  • Plate Resistance

    0.2 ohm

    Published operating/characteristic table

Data set 03

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

Diode

Capacitance

  • Plate to cathode and heater capacitance

    2.4 pF

  • Cathode to plate and heater capacitance

    3 pF

Other

  • Maximum DC plate current

    5 mA

    VideoDetectorDiode

SECTION 2

Pentode

Capacitance

  • Grid 1 to plate capacitance

    0.015 pF

  • Input capacitance

    7 pF

  • Output capacitance

    3.2 pF

Other

  • Plate voltage

    125 V

    ClassA1

  • Screen voltage

    125 V

    ClassA1

  • Cathode resistor

    56 ohm

    ClassA1

  • Plate current

    11.5 mA

    ClassA1

  • Screen current

    3.6 mA

    ClassA1

Characteristics

  • Grid 1 cutoff voltage

    -6 V

    Ib=20uA

Data set 04

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 1

Diode

Characteristics

  • Voltage (AC or DC) — published value 1

    6.3 V

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

  • Voltage (AC or DC) — published value 2

    6.3 V

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

  • Voltage (AC or DC) — published value 3

    0.6 V

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

  • Current — published value 1

    450 mA

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

  • Current — published value 2

    30 mA

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

  • Current — published value 3

    450 mA

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

  • Plate to cathode and heater

    2.4

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

  • Cathode to plate and heater

    3

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

  • and heater

    7

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

  • and heater

    3.2

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

  • Plate Supply Voltage

    125 V

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

  • Grid No 3

    3

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

  • Grid-No.2 Supply Voltage

    125 V

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

  • Cathode Resistor

    56 ohm

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

  • Plate Resistance (Approx.)

    0.2 Mohm

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

  • Transconductance

    9300

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

  • Plate Current

    11.5 mA

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

  • Grid-No.2 Current

    3.6 mA

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

  • plate µa = 20 — published value 1

    20 V

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

  • plate µa = 20 — published value 2

    -6 V

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

  • plate ma. = 2, and cathode

    2 mA

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

  • Pin 4 -Heater

    4

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

  • Pin 5 -Heater

    5

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

  • For grid-No.2 voltages between 165

    165 V

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

  • and 330 volts

    330 V

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

  • Plate Current for plate volts — published value 1

    10 V

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

  • Plate Current for plate volts — published value 2

    50 V

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

  • D AL heater volts = 6.9

    6.9 V

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

Other

  • respect to cathode

    200 V

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

  • respect to cathode

    200 V

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

  • Grid No.l to plate

    0.015 mA

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

  • PLATE VOLTAGE

    330 V

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

  • GRID-No.2 (SCREEN-GRID) SUPPLY VOLTAGE

    330 V

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

  • Positive-bias value

    0 V

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

  • For grid-No.2 voltages up to 165 volts — published value 1

    165 V

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

  • For grid-No.2 voltages up to 165 volts — published value 2

    0.55 V

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

  • PLATE DISSIPATION — published value 1

    3 mA

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

  • PLATE DISSIPATION — published value 2

    2 mA

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

  • For fixed-bias operation

    0.25 mA

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

  • For cathode-bias operation

    1 mA

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

  • DC PLATE CURRENT

    5 mA

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

SECTION 2

Pentode

Other

  • Plate voltage

    125 V

    ClassA

  • Maximum plate voltage

    330 V

  • Maximum screen-grid voltage

    330 V

  • Diode plate to pentode grid No.l

    0.005 mA

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

  • Diode cathode to pentode plate — published value 1

    0 mA

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

  • Diode cathode to pentode plate — published value 2

    15 mA

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

  • Diode plate to pentode plate

    0.035 mA

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

Characteristics

  • Pin 6 -Pentode Plate

    6

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