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Voltage Radio Detector Converter ·Pentode

4DT6

Dual-control sharp-cutoff pentode for FM detection, delay, gain-control, and mixer service in television receivers. Its independently effective control grids enable specialized television sound-detector and signal-processing functions.

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

Description

Sharp-cutoff pentode for FM detector, delay, gain-control and mixer service in television receivers.

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
150000 Ω
Transconductance
0.0008 S
Max plate voltage
300 V
Max screen voltage
300 V
Max plate dissipation
1.5 W
Max screen dissipation
1 W

Grid-1 transconductance promoted; grid-3 transconductance retained as 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

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Service

    FM detector / delay / gain-controlled amplifier / mixer

Data set 02

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate voltage

    150 V

    ClassA

  • Screen-grid voltage

    100 V

    ClassA

  • Grid 3 voltage

    0 V

    ClassA

  • Cathode bias resistor

    560 Ohm

    ClassA

  • Plate current

    1.7 mA

    ClassA

  • Screen-grid current

    2.1 mA

    ClassA

Characteristics

  • Plate resistance

    150000 Ohm

    ClassA

  • Grid 1 transconductance

    800 uS

    ClassA

  • Grid 3 transconductance

    515 uS

    ClassA

  • Grid 1 cutoff voltage

    -4.5 V

  • Grid 3 cutoff voltage

    -3.5 V

Capacitance

  • Grid 1 to plate capacitance

    0.02 pF

    Shielded

  • Grid 3 to plate capacitance

    1.4 pF

    Shielded

  • Grid 1 input capacitance

    5.8 pF

    Shielded

Data set 03

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

  • Plate Resistance

    150000 ohm

    RepresentativePublishedPoint

Other

  • Maximum Plate Voltage

    300 V

  • Maximum Plate Dissipation

    1.5 W

Data set 04

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • GRID #

    0.02 pF

    | GRID #1 TO PLATE 0.02 uuf

  • GRID #

    0.1 ΜΜF

    | GRID #1 TO GRID #~ 0.1 µµf

  • AND INTERNAL SHIELD AND CATHODE

    5.8 ΜΜF

    | AND INTERNAL SHIELD AND CATHODE 5.8 µµf

Other

  • HEATER VOLTAGE

    4.2 V

    Maximum Ratings | HEATER VOLTAGE 4.2 VOLTS

  • FOR GRID #

    65 V

    Maximum Ratings | FOR GRID #2 VOLTAGES UP TO X65 VOLTS 1.1 ~ WATTS

  • FOR GRID #

    330 V

    Maximum Ratings | FOR GRID #2 VOLTAGES BETWEEN 165 AND 330 VOLTS SEE JS—C4-2 ~

  • HEATER VOLTAGE

    4.2 V

    Typical Operating Conditions | HEATER VOLTAGE 4.2 VOLTS

  • PLATE SUPPLY VOLTAGE

    150 V

    Typical Operating Conditions | PLATE SUPPLY VOLTAGE 150 VOLTS

  • CATHODE-BIAS RESISTOR

    560 ohm

    Typical Operating Conditions | CATHODE-BIAS RESISTOR 560 OHMS

  • PLATE RESISTANCE (APPROX.)

    0.15 Mohm

    Typical Operating Conditions | PLATE RESISTANCE (APPROX.) 0.15 MEGOHM

  • GRID #

    515 ΜMHOS

    Typical Operating Conditions | GRID #3 TO PLATE 515 µMHOS

  • GRID #

    4.5 V

    Typical Operating Conditions | GRID #1 VOLTAGE (APPROX.) FOR PLATE CURRENT OF 10 µAMP —4.5 VOLTS

  • GRID #

    3.5 V

    Typical Operating Conditions | GRID #3 VOLTAGE (APPROX.) FOR PLATE CURRENT OF 10l/.AMP —3.5 voLTs

  • PLATE CURRENT

    1.1 mA

    Typical Operating Conditions | PLATE CURRENT 1.1 MA.

  • GRID #~ CURRENT

    2.1 mA

    Typical Operating Conditions | GRID #~ CURRENT 2.1 MA.

  • PLATE SUPPLY VOLTAGE

    250 V

    Typical Operating Conditions | PLATE SUPPLY VOLTAGE 25O 25O 250 VOLTS

  • CATHODE-BIAS RESISTOR

    560 ohm

    Typical Operating Conditions | CATHODE-BIAS RESISTOR 560 560 560 OHMS

  • PLATE LOAD RESISTOR

    0.27 Mohm

    Typical Operating Conditions | PLATE LOAD RESISTOR 0.27 0.27 0.27 MEGOHM

  • PLATE CURRENT

    0.21 mA

    Typical Operating Conditions | PLATE CURRENT 0.23 0.22 0.21 MA.

  • GRID #

    6 mA

    Typical Operating Conditions | GRID #2 CURRENT 3.4 5.5 6 MA.

  • FOR FIXED-BIAS OPERATION

    0.25 Mohm

    Typical Operating Conditions | FOR FIXED-BIAS OPERATION 0.25 MEGOHM

  • FOR CATHODE-BIAS OPERATION

    0.5 Mohm

    Typical Operating Conditions | FOR CATHODE-BIAS OPERATION 0.5 MEGOHM

Data set 05

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Heater Voltage

    4.2 V

  • Heater Current

    450 mA