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

Voltage Pentode - Remote Cutoff (single) ·Pentode

4HT6

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

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

Description

Semi-remote-cutoff pentode for AGC-controlled television 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
-
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

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
143000 Ω
Transconductance
0.014 S
Max plate voltage
330 V
Max screen voltage
330 V
Max plate dissipation
2.5 W
Max screen dissipation
0.7 W

Representative electrical 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

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate voltage

    125 V

  • Screen-grid voltage

    125 V

  • Cathode bias resistor

    56 Ohm

  • Plate current

    15 mA

  • Screen-grid current

    4 mA

Characteristics

  • Plate resistance

    143000 Ohm

  • Transconductance

    14000 uS

Capacitance

  • Grid-to-plate capacitance

    0.024 pF

    Shielded

  • Input capacitance

    8.7 pF

    Shielded

  • Output capacitance

    3 pF

    Shielded

Data set 02

1965 Westinghouse Data Book

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Heater Voltage

    4.2 V

  • Heater Current

    450 mA

  • Transconductance

    14000 uS

    RepresentativePublishedPoint

  • Plate Resistance

    143000 ohm

    RepresentativePublishedPoint

  • Grid-Plate Capacitance

    0.024 pF

    PublishedDirectInterelectrodeCapacitance

Other

  • Maximum Plate Voltage

    330 V

  • Maximum Plate Dissipation

    2.5 W

  • Plate Voltage

    125 V

  • Screen Voltage

    125 V

  • Cathode Bias Resistor

    56 ohm

  • Plate Current

    15 mA

  • Screen Current

    4 mA

Data set 03

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • LIMITS OF SUPPLIED CURRENT

    30 mA

    Average Characteristics | LIMITS OF SUPPLIED CURRENT 450 `- 30 MA.

  • PLATE VOLTAGE

    250 V

    Maximum Ratings | PLATE VOLTAGE 250 VOLTS

  • GRID

    250 V

    Maximum Ratings | GRID 2 SUPPLY vOLTAGE 250 VOLTS

  • GRID

    -50 V

    Maximum Ratings | GRID 1 VOLTAGE -50 VOLTS

  • PLATE DISSIPATION

    2.5 W

    Maximum Ratings | PLATE DISSIPATION 2.5 WATTS

  • GRID

    0.6 W

    Maximum Ratings | GRID 2 DISSIPATION 0.6 WATTS

  • CATHODE CURRENT

    25 mA

    Maximum Ratings | CATHODE CURRENT 25 MA.

  • CATHODE BIAS RESISTOR

    1 Mohm

    Maximum Ratings | CATHODE BIAS RESISTOR 1 MEGOHM

  • FIXED BIAS

    0.25 Mohm

    Maximum Ratings | FIXED BIAS 0.25 MEGOHM

  • PLATE VOLTAGE

    125 V

    Maximum Ratings | PLATE VOLTAGE 125 VOLTS

  • GRID

    125 V

    Maximum Ratings | GRID 2 VOLTAGE 125 VOLTS

  • CATHODE BIAS RESISTOR

    56 ohm

    Maximum Ratings | CATHODE BIAS RESISTOR 56 OHMS

  • PLATE CURRENT

    15 mA

    Maximum Ratings | PLATE CURRENT 15 MA.

  • GRID

    4 mA

    Maximum Ratings | GRID 2 CURRENT 4.0 MA.

  • TRANSCONDUCTANCE

    14 ΜMHOS

    Maximum Ratings | TRANSCONDUCTANCE 14.000 µMHOS

  • PLATE RESISTANCE

    0.143 Mohm

    Maximum Ratings | PLATE RESISTANCE 0.143 MEGOHM

  • GRID

    50 ΜMHOS

    Maximum Ratings | GRID 1 CUTOFF BIAS FOR G m= 50 µMHOS -6.7 VOLTS

  • GRID

    -6.7 V

    Maximum Ratings | GRID 1 CUTOFF BIAS FOR G m= 50 µMHOS -6.7 VOLTS

  • HOT INPUT RESISTANCE

    12.7 ohm

    Maximum Ratings | HOT INPUT RESISTANCE 12.700 OHMS

  • HOT INPUT CAPACITANCE

    7.45 pF

    Maximum Ratings | HOT INPUT CAPACITANCE 7.45 pf

  • A - MEASURED

    56 ohm

    Maximum Ratings | A - MEASURED 44 M~/a WITH UN BY PASSED 56 OHM CATHODE RESISTANCE

  • GRID .#

    2 mA

    Maximum Ratings | GRID .#2 MILLIAMPERES