1B7GT

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; listed on the same chart line as 1B7G.

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

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 02

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