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Voltage Radio Detector Converter ·Heptode

1C7G

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 / 120 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: G-7Z
Socket code: IO
Base pins: 8
Nominal heater voltage: 2 V
Nominal heater current: 120 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: 600000 Ω
Transconductance: 0.00044 S
Max plate voltage: 180 V
Max screen voltage: 67.5 V
Max plate dissipation: 0.3 W
Max screen dissipation: 0.2 W
Max cathode current: 9 mA

Conversion transconductance promoted; oscillator-anode limits retained as parameters.

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 supply voltage
135 V
FrequencyConverter
Grid 4 bias
-3 V
FrequencyConverter
Oscillator grid resistor
50000 ohm
FrequencyConverter
Plate current
1.3 mA
PlateVoltage=135V
Screen current
2 mA
PlateVoltage=135V
Grid 2 current
2.6 mA
PlateVoltage=135V
Oscillator grid current
0.2 mA
PlateVoltage=135V
Plate voltage
180 V
FrequencyConverter
Plate current
1.5 mA
PlateVoltage=180V

Characteristic

Plate resistance
0.55 MOhm
PlateVoltage=135V
Conversion transconductance
300 uS
PlateVoltage=135V
Plate resistance
0.75 MOhm
PlateVoltage=180V
Conversion transconductance
325 uS
PlateVoltage=180V
Oscillator-section transconductance
1000 uS
NotOscillating

Data set 02

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Heptode

Characteristic

Conversion Conductance
460 uS
Plate 180 V

Application

Frequency Range
24 MHz
Satisfactory to 20-24 MHz

Data set 03

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Heptode

Other

Oscillator grid current
0.2 mA
Converter
Grid resistor
50000 Ω
Converter
Plate voltage
180 V
Converter
Screen voltage
67.5 V
Converter
Control-grid voltage
-3 V
Converter
Plate current
1.5 mA
Converter
Screen current
2 mA
Converter
Oscillator-plate voltage
180 V
Converter
Oscillator-plate series resistance
20000 Ω
Converter
Oscillator-plate current
4 mA
Converter

Characteristic

Plate resistance
700000 Ω
Converter
Conversion transconductance
325 µS
Converter

Data set 04

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Heptode

Other

Filament Voltage
2 V
Nominal
Filament Current
120 mA
Nominal
Screen Supply Voltage
180 V
OscillatorAnodeSupplyVoltage
180 V
OscillatorAnodeVoltage
135 V
OscillatorAnodeDissipation
0.4 W
Plate Voltage
135 V
ConverterService;PlateVoltage=135V
Screen Voltage
67.5 V
ConverterService;PlateVoltage=135V
Control Grid Voltage
-3 V
ConverterService;PlateVoltage=135V
OscillatorAnodeSupplyVoltage
135 V
ConverterService;PlateVoltage=135V
Oscillator Grid Resistor
50000 ohm
ConverterService;PlateVoltage=135V
Plate Current
1.3 mA
ConverterService;PlateVoltage=135V
Screen Current
2.5 mA
ConverterService;PlateVoltage=135V
OscillatorAnodeCurrent
3.1 mA
ConverterService;PlateVoltage=135V
Oscillator Grid Current
0.2 mA
ConverterService;PlateVoltage=135V
Total Cathode Current
7.1 mA
ConverterService;PlateVoltage=135V
Plate Voltage
180 V
ConverterService;PlateVoltage=180V
Screen Voltage
67.5 V
ConverterService;PlateVoltage=180V
Control Grid Voltage
-3 V
ConverterService;PlateVoltage=180V
OscillatorAnodeSupplyVoltage
180 V
ConverterService;PlateVoltage=180V
Oscillator Grid Resistor
50000 ohm
ConverterService;PlateVoltage=180V
Plate Current
1.5 mA
ConverterService;PlateVoltage=180V
Screen Current
2 mA
ConverterService;PlateVoltage=180V
OscillatorAnodeCurrent
4 mA
ConverterService;PlateVoltage=180V
Oscillator Grid Current
0.2 mA
ConverterService;PlateVoltage=180V
Total Cathode Current
7.7 mA
ConverterService;PlateVoltage=180V

Capacitance

ControlGridToMixerPlateCapacitance
0.26 pF
ControlGridToOscillatorAnodeCapacitance
0.32 pF
ControlGridToOscillatorGridCapacitance
0.11 pF
OscillatorGridToOscillatorAnodeCapacitance
1.2 pF
RF Input Capacitance
10 pF
Oscillator Input Capacitance
4.8 pF
OscillatorOutputCapacitance
5.5 pF
MixerOutputCapacitance
14 pF

Characteristic

Plate Resistance
600000 ohm
ConverterService;PlateVoltage=135V
Conversion Transconductance
440 uS
ConverterService;PlateVoltage=135V
Plate Resistance
700000 ohm
ConverterService;PlateVoltage=180V
Conversion Transconductance
450 uS
ConverterService;PlateVoltage=180V