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Voltage Pentode or Tetrode (under 100V) ·Heptode

DK96

Very low-consumption battery heptode for oscillator-mixer frequency conversion in portable radios. Its 1.4 V, 25 mA filament is specifically suited to receivers where extending battery life is important.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
B7G
Socket code
B7G
Base pins
7
Nominal heater
1.4 V / 25 mA

Description

Directly heated heptode frequency converter for low-power receiver mixer service.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
B7G
Socket code
B7G
Base pins
7
Nominal heater voltage
1.4 V
Nominal heater current
25 mA
Parallel heater voltage
1.4 V
Parallel heater current
25 mA
Series capable
No

B7G - 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

Heptode

X-ray radiationInterelectrode capacitances
Plate resistance
800000 Ω
Transconductance
0.0003 S
Amplification factor
7.5
Max plate voltage
90 V
Max screen voltage
60 V
Max plate dissipation
0.15 W
Max screen dissipation
0.1 W
Max cathode current
2.6 mA

Published ratings and characteristics promoted from the printed technical data.

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

1953 RFT Rundfunk Technik

Published operating points and test conditions from this source.

SECTION 1

Heptode

Other

  • HeaterVoltageNominal

    1.4 V

    Nominal

  • HeaterCurrentNominal

    25 mA

    Nominal

  • Maximum Plate Voltage

    90 V

  • Maximum Screen Voltage

    90 V

  • Maximum Plate Dissipation

    0.15 W

  • Maximum Screen Dissipation

    0.1 W

  • Maximum Cathode Current

    2.6 mA

Data set 02

1958 Brimar Radio Valve No 7

Published operating points and test conditions from this source.

SECTION 1

Heptode

Application

  • Application

    Frequency changer / oscillator-mixer

Data set 03

1961 Ferranti Technical Handbook

Published operating points and test conditions from this source.

SECTION 1

Heptode

Application

  • Application

    Frequency changer / oscillator-mixer

Data set 04

1963 Mullard

Published operating points and test conditions from this source.

SECTION 1

Heptode

Characteristics

  • Filament Voltage Series

    1.3 V

  • Filament Current Series

    24 mA

  • Filament Voltage Parallel

    1.4 V

  • Filament Current Parallel

    25 mA

  • Conversion Transconductance

    300 uS

  • Plate Resistance

    800000 ohm

Other

  • Plate Supply Voltage

    85 V

    FrequencyChanger

  • Screen Voltage Approximate

    68 V

    FrequencyChanger

  • Oscillator Grid Voltage Approximate

    35 V

    FrequencyChanger

  • Oscillator Drive Voltage

    4 V

    RMS

  • Total Cathode Current

    2.4 mA

    FrequencyChanger

  • Plate Current

    0.6 mA

    FrequencyChanger

  • Screen Current

    0.14 mA

    FrequencyChanger

  • Oscillator Current

    1.5 mA

    FrequencyChanger

  • Grid Current

    85 uA

    FrequencyChanger

  • Maximum Plate Supply Voltage

    110 V

    Absolute

  • Maximum Plate Voltage

    90 V

  • Maximum Plate Dissipation

    0.15 W

  • Maximum Screen Voltage

    60 V

  • Maximum Screen Dissipation

    0.1 W

  • Maximum Cathode Current

    2.6 mA

Data set 05

1963 Philips Electron Tubes Handbook V1

Published operating points and test conditions from this source.

SECTION 1

Heptode

Capacitance

  • Grid-1 capacitance

    3.9 pF

  • Grid-2 capacitance

    4.8 pF

  • Grid-3 capacitance

    7.4 pF

  • Plate capacitance

    8.1 pF

  • Plate-to-grid-1 capacitance

    - to 0.11 pF

  • Plate-to-grid-3 capacitance

    - to 0.36 pF

Other

  • Plate voltage

    85 V

    SeparateOscillator

  • Plate current

    0.6 mA

    SeparateOscillator

  • Screen current

    1.5 mA

    SeparateOscillator

  • Oscillator plate voltage

    85 V

    OscillatorSection

  • Oscillator screen voltage

    35 V

    OscillatorSection

  • Oscillator screen current

    1.7 mA

    OscillatorSection

Characteristic

  • Conversion transconductance

    300 uS

Data set 06

1967 Mullard Receiving Tubes for Maintenance

Published operating points and test conditions from this source.

SECTION 1

Heptode

Capacitance

  • Plate-to-All Capacitance

    8.1 pF

    PublishedCapacitance

  • Grid1-to-All Capacitance

    3.9 pF

    PublishedCapacitance

  • Grid2-to-All Capacitance

    4.8 pF

    PublishedCapacitance

  • Grid3-to-All Capacitance

    7.4 pF

    PublishedCapacitance

  • Plate-to-Grid1 Capacitance

    <0.11 pF

    PublishedCapacitance

  • Plate-to-Grid2 Capacitance

    <0.3 pF

    PublishedCapacitance

  • Plate-to-Grid3 Capacitance

    <0.36 pF

    PublishedCapacitance

  • Grid1-to-Grid2 Capacitance

    3 pF

    PublishedCapacitance

  • Grid1-to-Grid3 Capacitance

    <0.2 pF

    PublishedCapacitance

  • Grid2-to-Grid3 Capacitance

    1.6 pF

    PublishedCapacitance

Other

  • Plate Supply Voltage

    85 V

    FrequencyChanger;85VPoint

  • Grid4 Voltage

    68 V

    FrequencyChanger;85VPoint

  • Grid2 Voltage

    35 V

    FrequencyChanger;85VPoint

  • Oscillator Drive RMS

    4 V

    FrequencyChanger;85VPoint

  • Cathode Current

    2.4 mA

    FrequencyChanger;85VPoint

  • Plate Current

    600 uA

    FrequencyChanger;85VPoint

  • Grid4 Current

    140 uA

    FrequencyChanger;85VPoint

  • Grid2 Current

    1.5 mA

    FrequencyChanger;85VPoint

  • Grid1 Current

    85 uA

    FrequencyChanger;85VPoint

  • Conversion Conductance

    300 uS

    FrequencyChanger;85VPoint

  • Plate Resistance

    800 kohm

    FrequencyChanger;85VPoint

  • Oscillator Transconductance

    600 uS

    FrequencyChanger;85VPoint

  • Oscillator Mu

    7.5

    FrequencyChanger;85VPoint

  • Supply Voltage Absolute

    110 V

    PublishedLimits

  • Supply Voltage

    90 V

    PublishedLimits

  • Plate Voltage

    90 V

    PublishedLimits

  • Plate Dissipation

    0.15 W

    PublishedLimits

  • Grid4 Voltage

    60 V

    PublishedLimits

  • Grid4 Dissipation

    0.1 W

    PublishedLimits

  • Grid2 Voltage

    90 V

    PublishedLimits

  • Grid2 Dissipation

    0.03 W

    PublishedLimits

  • Cathode Current

    2.6 mA

    PublishedLimits

Data set 07

1968 Mazda Belvu

Published operating points and test conditions from this source.

SECTION 1

Heptode

Application

  • Application

    FrequencyConverter text

Data set 08

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Heptode

Other

  • Plate resistance

    0.8 MΩ

    FrequencyConverter

  • Conversion transconductance

    275 µS

    Vg3=-4.5V