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Voltage Pentode - Remote Cutoff (single) ·Pentode

4JH6

Semi-remote-cutoff pentode designed for AGC-controlled television picture-IF or related television amplifier service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
7CM
Socket code
B7G
Base pins
7
Nominal heater
4.2 V / 450 mA

Description

Semiremote-cutoff miniature pentode used in gain-controlled television picture-IF amplifier stages.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
7CM
Socket code
B7G
Base pins
7
Nominal heater voltage
4.2 V
Nominal heater current
450 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

7CM - Terminal pinout

Electrical assignments shared by every tube using this base designation.

TerminalSectionConnectionEvidence
PIN1G1AG1 — Control Grid

EIA chart transcription; manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7CM

PIN2KAK — Cathode

EIA chart transcription; manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7CM

PIN3H—H — Heater

EIA chart transcription; manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7CM

PIN4H—H — Heater

EIA chart transcription; manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7CM

PIN5PAP — Plate (Anode)

EIA chart transcription; manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7CM

PIN6G2AG2 — Screen Grid

EIA chart transcription; manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7CM

PIN7G3AG3 — Suppressor GridGroup 7CM7

EIA chart transcription; manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7CM

PIN7ISAIS — Internal ScreenGroup 7CM7

EIA chart transcription; manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7CM

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
260000 Ω
Transconductance
0.008 S
Max plate voltage
300 V
Max screen voltage
300 V
Max screen dissipation
0.55 W

Promoted from published maximum-ratings/characteristics tables; additional source values are 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

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Peak value

    200 V

    Other;PublishedValue1

  • Peak value

    200 V

    Other;PublishedValue2

  • Average value

    100 V

    Other;PublishedValue1

  • Average value

    100 V

    Other;PublishedValue2

  • Plate Voltage

    300 V

    MaximumRating

  • Grid-No.3 (Suppressor-Grid) Voltage, Positive value

    0 V

    MaximumRating

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

    300 V

    MaximumRating

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

    0 V

    MaximumRating

  • For grid-No.2 voltages up to 150 volts

    0.55 V

    MaximumRating

  • For fixed-bias operation

    0.25 megohm

    MaximumCircuitValue

  • For cathode-bias operation

    1 megohm

    MaximumCircuitValue

  • PlateVoltage (Each Plate)

    330 V

    MaximumRating

  • Negative value

    165 V

    MaximumRating

  • Positive value

    165 V

    MaximumRating

  • Grid-No.3 ( Accelerating-Grid) Voltage

    330 V

    MaximumRating

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

    0 V

    MaximumRating

  • Cathode Current

    33 mA

    MaximumRating

Capacitance

  • Grid No.l to Plate

    0.025 pF

    Capacitance;PublishedValue1

  • Grid No.l to Plate

    0.015 pF

    Capacitance;PublishedValue2

  • Grid No.3, and Internal Shield

    7 pF

    Capacitance

  • and Internal Shield

    2 pF

    Capacitance

  • Grid No.l to All Other Electrodes, Except Both Plates

    7.5 pF

    Capacitance

  • Grid No.l to Deflecting Electrode No.l

    0.04 pF

    Capacitance

  • Grid No.l to Deflecting Electrode No.2

    0.07 pF

    Capacitance

  • Plate No.l to All Other Electrodes

    5 pF

    Capacitance

  • Plate No.2 to All Other Electrodes

    5 pF

    Capacitance

  • Plate No.l to Plate No.2

    0.4 pF

    Capacitance

  • Deflecting Electrode No.l to All Other Electrodes

    4.8 pF

    Capacitance

  • Deflecting Electrode No.2 to All Other Elecetrodes

    4.8 pF

    Capacitance

  • Deflecting Electrode No. 1 to Deflecting Electrode No.2

    0.38 pF

    Capacitance

Characteristic

  • Plate Supply Voltage

    125 V

    Characteristic

  • Grid-No.2 Supply Voltage

    125 V

    Characteristic

  • Plate Resistance (Approx.)

    0.26 megohm

    Characteristic

  • Transconductance Range for grid-No.l voltage of

    -4.5 V

    Characteristic

  • Plate Current

    14 mA

    Characteristic

  • Grid-No.2 Current

    3.6 mA

    Characteristic

  • Grid-No.l Voltage (Approx.) for transconductance of 50 /imhos

    19 V

    Characteristic