1D7G

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: G-7Z
Socket code: IO
Base pins: 8
Nominal heater: 2 V / 60 mA

Description

Directly heated pentagrid converter for frequency-converter service.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: G-7Z
Socket code: IO
Base pins: 8
Nominal heater voltage: 2 V
Nominal heater current: 60 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

G-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: 400000 Ω
Transconductance: 0.000275 S
Max plate voltage: 180 V
Max screen voltage: 67.5 V
Max cathode current: 9 mA

Conversion conductance promoted; static oscillator-grid-to-anode 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

1937 Raytheon Radio Receiving Tubes

Published operating points and test conditions from this source.

SECTION 1

Heptode

Other

Maximum grid 2 voltage
135 V
Maximum grid 2 supply voltage
180 V
ThroughSeriesResistor
Minimum grid 4 bias
-3 V
Plate voltage
135 V
FrequencyConverter
Screen voltage
67.5 V
FrequencyConverter
Grid 2 voltage
135 V
FrequencyConverter
Grid 4 bias
-3 V
FrequencyConverter
Oscillator grid resistor
50000 ohm
FrequencyConverter
Plate current
1.2 mA
PlateVoltage=135V
Screen current
2.5 mA
PlateVoltage=135V
Grid 2 current
2.3 mA
PlateVoltage=135V
Oscillator grid current
0.2 mA
PlateVoltage=135V
Total cathode current
6.2 mA
PlateVoltage=135V
Plate voltage
180 V
FrequencyConverter
Plate current
1.3 mA
PlateVoltage=180V

Characteristic

Plate resistance
0.4 MOhm
PlateVoltage=135V
Conversion transconductance
275 uS
PlateVoltage=135V
Conversion transconductance
300 uS
PlateVoltage=180V
Oscillator-section transconductance
425 uS
NotOscillating

Data set 02

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Heptode

Other

Maximum plate voltage
180 V
Maximum screen-grid voltage
67.5 V
Oscillator grid current
0.2 mA
Converter
Oscillator grid resistor
50000 Ohm
Converter
Plate voltage
180 V
Converter
Screen-grid voltage
67.5 V
Converter
Control-grid voltage
-3 V
Converter
Plate current
1.3 mA
Converter
Screen-grid current
2.4 mA
Converter
Plate resistance
500000 Ohm
Converter
Conversion transconductance
300 uS
Converter
Oscillator plate voltage
180 V
Converter

Data set 03

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Heptode

Other

Filament Voltage
2 V
Nominal
Filament Current
60 mA
Nominal
OscillatorAnodeVoltage
135 V
OscillatorAnodeSupplyVoltage
180 V
Control Grid Voltage
-3 V
Total Cathode Current
9 mA
Plate Voltage
135 V
ConverterService;PlateVoltage=135V
Screen Voltage
67.5 V
ConverterService;PlateVoltage=135V
OscillatorAnodeVoltage
135 V
ConverterService;PlateVoltage=135V
OscillatorAnodeSupplyVoltage
135 V
ConverterService;PlateVoltage=135V
Control Grid Voltage
-3 V
ConverterService;PlateVoltage=135V
Oscillator Grid Resistor
50000 ohm
ConverterService;PlateVoltage=135V
Plate Current
1.2 mA
ConverterService;PlateVoltage=135V
Screen Current
2.5 mA
ConverterService;PlateVoltage=135V
OscillatorAnodeCurrent
2.3 mA
ConverterService;PlateVoltage=135V
Oscillator Grid Current
0.2 mA
ConverterService;PlateVoltage=135V
Total Cathode Current
6.2 mA
ConverterService;PlateVoltage=135V
Plate Voltage
180 V
ConverterService;PlateVoltage=180V
Screen Voltage
67.5 V
ConverterService;PlateVoltage=180V
OscillatorAnodeVoltage
135 V
ConverterService;PlateVoltage=180V
OscillatorAnodeSupplyVoltage
180 V
ConverterService;PlateVoltage=180V
Control Grid Voltage
-3 V
ConverterService;PlateVoltage=180V
Oscillator Grid Resistor
50000 ohm
ConverterService;PlateVoltage=180V
Plate Current
1.3 mA
ConverterService;PlateVoltage=180V
Screen Current
2.4 mA
ConverterService;PlateVoltage=180V
OscillatorAnodeCurrent
2.3 mA
ConverterService;PlateVoltage=180V
Oscillator Grid Current
0.2 mA
ConverterService;PlateVoltage=180V
Total Cathode Current
6.2 mA
ConverterService;PlateVoltage=180V

Characteristic

Plate Resistance
400000 ohm
ConverterService;PlateVoltage=135V
Conversion Conductance
275 uS
ConverterService;PlateVoltage=135V
Plate Resistance
500000 ohm
ConverterService;PlateVoltage=180V
Conversion Conductance
300 uS
ConverterService;PlateVoltage=180V
Oscillator Transconductance
425 uS
StaticOscillatorSectionNotOscillating

Capacitance

ControlGridToPlateCapacitance
0.26 pF
WithShield
ControlGridToOscillatorGridCapacitance
0.11 pF
WithShield
ControlGridToAnodeGridCapacitance
0.32 pF
WithShield
OscillatorGridToAnodeGridCapacitance
1.2 pF
WithShield
RF Input Capacitance
10 pF
WithShield
Oscillator Input Capacitance
4.8 pF
WithShield
OscillatorOutputCapacitance
5.5 pF
WithShield
MixerOutputCapacitance
14 pF
WithShield