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Voltage Pentode - Sharp Cutoff (single) ·Pentode

4DK6

Sharp-cutoff pentode designed for television IF, picture-IF, video, or VHF tuner amplifier service.

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

Description

Sharp-cutoff miniature pentode used as an IF amplifier in color and black-and-white 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
350000 Ω
Transconductance
0.0098 S
Max plate voltage
330 V
Max screen voltage
330 V
Max plate dissipation
1.7 W
Max screen dissipation
0.55 W

Reference/equivalence-only source: ratings/characteristics for this section are not reproduced; missing promoted values intentionally not inferred from the external 6DK6 datasheet.

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

    12 mA

  • Screen-grid current

    3.8 mA

Characteristics

  • Plate resistance

    350000 Ohm

  • Transconductance

    9800 uS

  • Control-grid cutoff voltage

    -6.5 V

Capacitance

  • Grid-to-plate capacitance

    0.025 pF

    Unshielded

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

  • Plate Resistance

    350000 ohm

    RepresentativePublishedPoint

Other

  • Maximum Plate Voltage

    330 V

  • Maximum Plate Dissipation

    2.3 W

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-to-plate capacitance maximum

    0.025 pF

    Section1

  • Input capacitance

    6.3 pF

    Section1

  • Output capacitance

    7.9 pF

    Section1

Characteristic

  • Heater warm-up time

    11 s

    Section1

  • Transconductance

    9800 µS

    Section1

  • Plate resistance

    0.35 MΩ

    Section1

  • Control-grid voltage at 20 uA plate current

    -6.5 V

    Section1

Other

  • Plate voltage

    125 V

    IFAmplifier

  • Screen voltage

    125 V

    IFAmplifier

  • Cathode-bias resistor

    56 Ω

    IFAmplifier

  • Plate current

    12 mA

    IFAmplifier

  • Screen current

    3.8 mA

    IFAmplifier

Data set 04

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

Data set 05

1971 RCA HB3 Binder 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Heater Current

    420 mA to 480 mA

    Published nominal ± tolerance

  • Heater Voltage

    4.2 V

    At heater current 0.45 A

  • Warm-Up Time

    11 s

    Average

  • Plate Voltage

    330 V

    Inherited from explicitly referenced 6-volt parent type; heater variant

  • Screen Supply Voltage

    330 V

    Inherited from explicitly referenced 6-volt parent type; heater variant

  • Plate Dissipation

    2.3 W

    Inherited from explicitly referenced 6-volt parent type; heater variant

Characteristics

  • Transconductance

    9800 µS

    Inherited from explicitly referenced 6-volt parent type; heater variant

Data set 06

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate Current

    15 mA

    Published in approved 12DK6 target entry; Section1

  • Equivalent Noise Resistance

    300 Ω

    Published in approved 12DK6 target entry; Section1

  • Grid-Circuit Resistance

    1 MΩ

    Published in approved 12DK6 target entry; Section1

  • Heater to Cathode Circuit Resistance

    0.02 MΩ

    Published in approved 12DK6 target entry; Section1

  • Heater Voltage (ac/dc) 3.16 4.2 6.3

    12.6 V

    Published in approved 12DK6 target entry; Section1

  • Heater Current 0.6 0.45 0.3

    150 mA

    Published in approved 12DK6 target entry; Section1

  • Plate Voltage

    330 V

    Published in approved 12DK6 target entry; Section1

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

    0 V

    Published in approved 12DK6 target entry; Section1

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

    330 V

    Published in approved 12DK6 target entry; Section1

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

    0 V

    Published in approved 12DK6 target entry; Section1

  • Plate Dissipation

    2.3 W

    Published in approved 12DK6 target entry; Section1

  • For grid-No.2 voltages up to

    165 V

    Published in approved 12DK6 target entry; Section1

  • For grid-No.2 voltages up to 165 volts

    0.55 W

    Published in approved 12DK6 target entry; Section1

  • For grid-No.2 voltages between 165 and

    330 V

    Published in approved 12DK6 target entry; Section1

Capacitance

  • Internal Shield

    6.3 pF

    Published in approved 12DK6 target entry; Section1

  • Internal Shield

    1.9 pF

    Published in approved 12DK6 target entry; Section1

Characteristic

  • Grid-No.! Voltagre (Approx.) for plate current of 20 fiA

    -6.5 V

    Published in approved 12DK6 target entry; Section1