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Voltage Radio Detector Converter ·Heptode

1B7G

Battery or receiving-tube frequency converter combining local-oscillator and mixer action for superheterodyne radio service. Its multi-grid structure provides frequency conversion while minimizing component count and, in battery types, filament power.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
7Z
Socket code
IO
Base pins
8
Nominal heater
1.4 V / 100 mA

Description

Directly heated pentagrid converter for frequency-conversion service.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
7Z
Socket code
IO
Base pins
8
Nominal heater voltage
1.4 V
Nominal heater current
100 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

7Z - 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
350000 Ω
Transconductance
0.00035 S
Max plate voltage
100 V
Max screen voltage
55 V
Max cathode current
6 mA

Conversion transconductance promoted as the converter transconductance characteristic.

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

1937 Ken Rad

Published operating points and test conditions from this source.

SECTION 1

Heptode

Characteristics

  • Plate Voltage

    90 V

    Plate Voltage 90 Volts

  • Grid Voltage

    90 V

    Ancde Grid Voltage (Crid No. 2) 90 Volts

  • Grid Voltage

    0 V

    Control Grid Voltage (Grid No. 4) 0 Volts

  • Plate Current

    1.5 A

    Plate Current 1.5 Mi{lliamperes

  • Grid Current

    35 µA

    Oscillator Grid Current 35 Hicroamperes

  • Grid Voltage

    4 V

    —— CONTROL GRID VOLTAGE (GRID HO.4) >

Other

  • Filament voltage

    1.4 V

    Published filament rating

  • Filament current

    100 mA

    Published filament rating

Data set 02

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Heptode

Characteristic

  • Tension filament CC. 1,4 volt

    1.4 V

    Tension filament CC. 1,4 volt

  • Courant fitament ... ... ... .. ... .. .. .. 0,100 ampére

    100 mA

    Courant fitament ... ... ... .. ... .. .. .. 0,100 ampére

  • Tension filament CC. ... ... ... ... .. .. 1,4 volt

    1.4 V

    Tension filament CC. ... ... ... ... .. .. 1,4 volt

  • Courant filament 0,100 ma.

    0.1 ma

    Courant filament 0,100 ma.

  • Tension filament CC. ... ... ... .. .. .. .. 1,4 volt

    1.4 V

    Tension filament CC. ... ... ... .. .. .. .. 1,4 volt

  • Tension plaque ... ... .. .. . o . . 90 volts

    90 V

    Tension plaque ... ... .. .. . o . . 90 volts

  • Tension grille écran *x 45 volts

    45 V

    Tension grille écran *x 45 volts

  • Tension grille anode ... 90 volts

    90 V

    Tension grille anode ... 90 volts

  • Tension grille de contrdle (G) sae v e e 0 volt

    0 V

    Tension grille de contrdle (G) sae v e e 0 volt

  • Courant plaque ... ... ... .. .. o o 1,5 ma.

    1.5 ma

    Courant plaque ... ... ... .. .. o o 1,5 ma.

  • Courant grille-écran - ... ... ... ... ... ... .. 1,3 ma.

    1.3 ma

    Courant grille-écran - ... ... ... ... ... ... .. 1,3 ma.

  • Courant grifle anode ... ... .. .. .. .. .. 1,6 ma.

    1.6 ma

    Courant grifle anode ... ... .. .. .. .. .. 1,6 ma.

  • Courant grille oscillatrice ... ... ... ... .. .. 0,035 ma.

    0.035 ma

    Courant grille oscillatrice ... ... ... ... .. .. 0,035 ma.

  • Courant cathodique total ... ... ... 4,4 ma.

    4.4 ma

    Courant cathodique total ... ... ... 4,4 ma.

  • Conductance de conversion pour 0 volt grille

    0 V

    Conductance de conversion pour 0 volt grille

  • Conductance de couvers:onpour —14 volts gnlle

    14 V

    Conductance de couvers:onpour —14 volts gnlle

  • la pente. Le filament fonctionne sous 1,4 volt 100 millis. Toutefois,

    1.4 V

    la pente. Le filament fonctionne sous 1,4 volt 100 millis. Toutefois,

  • Une batterie B de 90 volts est nécessaire pour les tensions de pla-

    90 V

    Une batterie B de 90 volts est nécessaire pour les tensions de pla-

  • que, grille-écran et grille d’anode. Une résistance de 30000 ohms

    30000 ohms

    que, grille-écran et grille d’anode. Une résistance de 30000 ohms

  • 4 A, V. C., soit & travers une résistance de 1 mégohm convenable-

    4 A

    4 A, V. C., soit & travers une résistance de 1 mégohm convenable-

Other

  • Tension plaque ... 90 volts max.

    90 V

    Tension plaque ... 90 volts max.

  • Source tension grille ecran (Gs) 90 volts max.

    90 V

    Source tension grille ecran (Gs) 90 volts max.

  • Tension €cran ... .. . sl ae e e aen 33 volts max.

    33 V

    Tension €cran ... .. . sl ae e e aen 33 volts max.

  • Courant cathodique total 5,0 ma, max.

    5 ma

    Courant cathodique total 5,0 ma, max.

Data set 03

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Heptode

Other

  • Oscillator grid current

    0.035 mA

    Converter

  • Grid resistor

    200000 Ω

    Converter

  • Plate voltage

    90 V

    Converter

  • Screen voltage

    45 V

    Converter

  • Control-grid voltage

    0 V

    Converter

  • Plate current

    1.5 mA

    Converter

  • Screen current

    1.3 mA

    Converter

  • Oscillator-plate voltage

    90 V

    Converter

  • Oscillator-plate current

    1.6 mA

    Converter

Characteristic

  • Plate resistance

    350000 Ω

    Converter

  • Conversion transconductance

    350 µS

    Converter

Data set 04

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Heptode

Other

  • Filament Voltage

    1.4 V

    Nominal

  • Filament Current

    100 mA

    Nominal

  • Plate Voltage

    90 V

    ConverterService

  • Screen Voltage

    45 V

    ConverterService

  • OscillatorAnodeVoltage

    90 V

    ConverterService

  • Control Grid Voltage

    0 V

    ConverterService

  • Oscillator Grid Resistor

    200000 ohm

    ConverterService

  • Plate Current

    1.5 mA

    ConverterService

  • Screen Current

    1.3 mA

    ConverterService

  • OscillatorAnodeCurrent

    1.6 mA

    ConverterService

  • Oscillator Grid Current

    0.035 mA

    ConverterService

  • Total Cathode Current

    4.4 mA

    ConverterService

Capacitance

  • SignalGridToMixerPlateCapacitance

    0.34 pF

    ShieldToNegativeFilament

  • SignalGridToOscillatorPlateCapacitance

    0.26 pF

    ShieldToNegativeFilament

  • SignalGridToOscillatorGridCapacitance

    0.12 pF

    ShieldToNegativeFilament

  • OscillatorGridToOscillatorPlateCapacitance

    0.9 pF

    ShieldToNegativeFilament

  • SignalInputCapacitance

    7 pF

    ShieldToNegativeFilament

  • OscillatorOutputCapacitance

    4.2 pF

    ShieldToNegativeFilament

  • Oscillator Input Capacitance

    4 pF

    ShieldToNegativeFilament

  • MixerOutputCapacitance

    7.5 pF

    ShieldToNegativeFilament

Characteristic

  • Plate Resistance

    350000 ohm

    ConverterService

  • Conversion Transconductance

    350 uS

    ConverterService

  • ControlGridVoltageForConversionTransconductance2uS

    -14.5 V

    Approx