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Voltage Pentode - Remote Cutoff (single) ·Pentode

6HT6

Frame-grid semi-remote-cutoff pentode for AGC-controlled television IF amplification, providing very high transconductance and wideband gain.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
9PM
Socket code
B7G
Base pins
7
Nominal heater
6.3 V / 300 mA

Description

The 6HT6 is a semi-remote-cutoff pentode designed for television IF amplifier stages, with its cutoff characteristic tailored for automatic-gain-control operation.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
9PM
Socket code
B7G
Base pins
7
Nominal heater voltage
6.3 V
Nominal heater current
300 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

9PM - 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
250 V
Max screen voltage
250 V
Max plate dissipation
2.5 W
Max screen dissipation
0.6 W
Max cathode current
25 mA

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

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate Voltage

    250 V

    Published operating/characteristic table

  • Screen Voltage

    2 V

    Published operating/characteristic table

  • Grid Voltage

    -50 V

    Published operating/characteristic table

Characteristic

  • Plate Current

    15 mA

    Published operating/characteristic table

  • Screen Current

    4 mA

    Published operating/characteristic table

  • Transconductance

    14000 uS

    Published operating/characteristic table

  • Plate Resistance

    0.143 ohm

    Published operating/characteristic table

Data set 02

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 03

1965 Westinghouse Data Book

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Heater Voltage

    6.3 V

  • Heater Current

    300 mA

  • Plate Resistance

    143000 ohm

  • Transconductance

    14000 uS

Other

  • Maximum Plate Voltage

    250 V

  • Maximum Plate Dissipation

    2.5 W

  • Maximum Screen Supply Voltage

    250 V

  • Maximum Screen Dissipation

    0.6 W

  • Plate Voltage

    125 V

  • Screen Voltage

    125 V

  • Plate Current

    15 mA

  • Screen Current

    4 mA

Data set 04

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

  • Grid 1 to plate capacitance

    0.024 pF

  • Input capacitance

    8.7 pF

  • Output capacitance

    3 pF

Other

  • Plate voltage

    125 V

    ClassA1

  • Screen voltage

    125 V

    ClassA1

  • Cathode resistor

    56 ohm

    ClassA1

  • Plate current

    15 mA

    ClassA1

  • Screen current

    4 mA

    ClassA1

Characteristics

  • Grid 1 cutoff bias

    -6.7 V

    Gm=50uS

  • Hot input resistance

    12700 ohm

    At44MHz

  • Hot input capacitance

    7.45 pF

    At44MHz