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Voltage Radio Detector Converter ·Heptode

DK92

Battery heptode frequency changer for oscillator-mixer operation in portable superheterodyne receivers. Its low-power directly heated construction provides useful conversion gain from economical battery supplies.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
B7G
Socket code
B7G
Base pins
7
Nominal heater
1.4 V / 50 mA

Description

Directly heated heptode frequency converter for battery-operated 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
50 mA
Parallel heater voltage
1.4 V
Parallel heater current
50 mA
Series capable
Yes

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
1000000 Ω
Transconductance
0.000325 S
Amplification factor
7.5
Max plate voltage
120 V
Max screen voltage
90 V
Max plate dissipation
0.2 W
Max screen dissipation
0.2 W
Max cathode current
4 mA

Heptode frequency changer for battery sets.

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 Ferranti Technical Handbook

Published operating points and test conditions from this source.

SECTION 1

Heptode

Application

  • Application

    Frequency changer / oscillator-mixer

Data set 02

1963 Mullard

Published operating points and test conditions from this source.

SECTION 1

Heptode

Characteristics

  • Filament Voltage Series

    1.3 V

  • Filament Current Series

    48 mA

  • Filament Voltage Parallel

    1.4 V

  • Filament Current Parallel

    50 mA

  • Conversion Transconductance

    325 uS

  • Plate Resistance

    650000 ohm

Other

  • Plate Supply Voltage

    85 V

    FrequencyChanger

  • Screen Voltage Approximate

    60 V

    FrequencyChanger

  • Oscillator Grid Voltage Approximate

    30 V

    FrequencyChanger

  • Oscillator Drive Voltage

    4 V

    RMS

  • Total Cathode Current

    2.55 mA

    FrequencyChanger

  • Plate Current

    0.7 mA

    FrequencyChanger

  • Screen Current

    0.15 mA

    FrequencyChanger

  • Oscillator Current

    1.6 mA

    FrequencyChanger

  • Grid Current

    100 uA

    FrequencyChanger

  • Maximum Plate Supply Voltage

    140 V

    Absolute

  • Maximum Plate Voltage

    120 V

  • Maximum Screen Voltage

    90 V

  • Maximum Cathode Current

    4 mA

Data set 03

1963 Philips Electron Tubes Handbook V1

Published operating points and test conditions from this source.

SECTION 1

Heptode

Capacitance

  • Plate capacitance

    8.4 pF

  • Grid-3 capacitance

    7.5 pF

  • Grid-2 capacitance

    4.8 pF

  • Grid-1 capacitance

    3.9 pF

  • Plate-to-grid-3 capacitance

    - to 0.36 pF

  • Plate-to-grid-1 capacitance

    - to 0.11 pF

Other

  • Plate voltage

    85 V

    SeparateExcitation

  • Screen voltage

    30 V

    SeparateExcitation

  • Plate current

    0.65 mA

    SeparateExcitation

  • Oscillator plate voltage

    85 V

    OscillatorSection

  • Oscillator screen current

    2.5 mA

    OscillatorSection

Characteristic

  • Plate resistance

    1 Mohm

Data set 04

1967 Mullard Receiving Tubes for Maintenance

Published operating points and test conditions from this source.

SECTION 1

Heptode

Capacitance

  • All-Electrode Capacitance

    8.5 pF

    PublishedCapacitance

  • Grid3-to-All Capacitance

    7.5 pF

    PublishedCapacitance

  • Grid2-to-All Capacitance

    5 pF

    PublishedCapacitance

  • Grid1-to-All Capacitance

    4 pF

    PublishedCapacitance

Other

  • Plate Voltage

    85 V

    FrequencyChanger

  • Grid4 Voltage

    60 V

    FrequencyChanger

  • Grid2 Voltage

    30 V

    FrequencyChanger

  • Oscillator Drive RMS

    4 V

    FrequencyChanger

  • Cathode Current

    2.55 mA

    FrequencyChanger

  • Plate Current

    700 uA

    FrequencyChanger

  • Grid4 Current

    150 uA

    FrequencyChanger

  • Grid2 Current

    1.6 mA

    FrequencyChanger

  • Grid1 Current

    100 uA

    FrequencyChanger

  • Conversion Conductance

    325 uS

    FrequencyChanger

  • Plate Resistance

    650 kohm

    FrequencyChanger

  • Oscillator Transconductance

    900 uS

    FrequencyChanger

  • Oscillator Mu

    7.5

    FrequencyChanger

  • Supply Voltage Absolute

    140 V

    PublishedLimits

  • Supply Voltage

    120 V

    PublishedLimits

  • Plate Voltage

    90 V

    PublishedLimits

  • Grid4 Voltage

    90 V

    PublishedLimits

  • Grid2 Voltage

    60 V

    PublishedLimits

  • Cathode Current

    4 mA

    PublishedLimits

Data set 05

1968 Mazda Belvu

Published operating points and test conditions from this source.

SECTION 1

Heptode

Application

  • Application

    FrequencyConverter text

Data set 06

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Heptode

Other

  • Conversion transconductance

    325 µS

    SeparateExcitation

  • Plate resistance

    1 MΩ

    SeparateExcitation