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Voltage Radio Detector Converter ·Pentode

3DT6

Dual-control sharp-cutoff pentode for specialized television circuits including FM detection, delay, gain control, and mixing. Independently effective control grids provide greater functional versatility than an ordinary amplifier pentode.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
B7G
Base pins
7
Nominal heater
3.15 V / 600 mA

Description

Sharp-cutoff pentode with independent control grids for FM-detector, delay, gain-control, and mixer circuits in series-string 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
3.15 V
Nominal heater current
600 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

  • GRID #4 VOLTAGE (APPROX.) FOR PLATE CURRENT OF 10 uAMP

    4.5 VOLTS

    Published datasheet value

  • PLATE CURRENT

    1.1 MA

    Published datasheet value

  • GRID #2 CURRENT 3.4 5.5

    6 MA

    Published datasheet value

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

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

  • Grid-1-to-plate capacitance

    0.02 pF

    Section1

  • Grid-1-to-grid-3 capacitance

    0.1 pF

    Section1

  • Grid-3-to-other-electrodes capacitance

    6.1 pF

    Section1

  • Grid-3-to-plate capacitance

    1.4 pF

    Section1

Other

  • Plate supply voltage

    150 V

    FMDetector

  • Grid-2 supply voltage

    100 V

    FMDetector

  • Grid-3 voltage

    0 V

    FMDetector

  • Cathode-bias resistor

    560 Ω

    FMDetector

  • Plate current

    1.1 mA

    FMDetector

  • Screen current

    2.1 mA

    FMDetector

Characteristic

  • Plate resistance

    0.15 MΩ

    Section1

  • Grid-1-to-plate transconductance

    500 µS

    Section1

  • Grid-3-to-plate transconductance

    515 µS

    Section1

Data set 04

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Heater warm-up time

    11 s