1F5G

Directly heated battery power pentode providing roughly 0.3 W Class-A audio output for portable and farm radios.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: G-6X
Socket code: IO
Base pins: 7
Nominal heater: 2 V / 120 mA

Description

Directly heated power-amplifier pentode for Class A 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-6X
Socket code: IO
Base pins: 7
Nominal heater voltage: 2 V
Nominal heater current: 120 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

G-6X - 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

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 200000 Ω
Transconductance: 0.0017 S
Max plate voltage: 180 V
Max screen voltage: 180 V
Max plate dissipation: 1.75 W
Max screen dissipation: 0.75 W

Promoted characteristics use first listed Class A1 condition (90 V).

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

Pentode

Other

E— Maximum Plate Voltage
135 V
Published ratings
Maximum Screen Voltage
135 V
Published ratings
Plate Voltage
90
ClassA; Column1
Plate Voltage
135
ClassA; Column2
Screen Voltage
90 V
ClassA; Column1
Screen Voltage
135 V
ClassA; Column2
Plate Resistance
0.24 Mohm
ClassA; Column1
Plate Resistance
0.2 Mohm
ClassA; Column2
Transconductance
1400 uS
ClassA; Column1
Transconductance
1700 uS
ClassA; Column2
Plate Current
4 mA
ClassA; Column1
Plate Current
8 mA
ClassA; Column2
Screen Current
1.3
ClassA; Column1
Screen Current
2.6
ClassA; Column2
Load Resistance
20000 ohm
ClassA; Column1
Load Resistance
16000 ohm
ClassA; Column2
Total Harmonic Distortion [
5 %
ClassA
Power Output
120
ClassA; Column1
Power Output
340
ClassA; Column2

Data set 02

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate Current
8 mA
ClassA; Plate 135 V
Power Output
0.31 W
ClassA

Data set 03

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Maximum plate voltage
180 V
Maximum screen-grid voltage
180 V
Plate voltage
135 V
ClassA
Screen-grid voltage
135 V
ClassA
Control-grid voltage
-4.5 V
ClassA
Plate current
5 mA
ClassA
Screen-grid current
2.4 mA
ClassA
Plate resistance
200000 Ohm
ClassA
Transconductance
1700 uS
ClassA
Load resistance
16000 Ohm
ClassA
Power output
0.31 W
ClassA
Plate voltage
90 V
ClassA 90V
Screen-grid voltage
90 V
ClassA 90V
Control-grid voltage
-3 V
ClassA 90V
Plate current
4 mA
ClassA 90V
Screen-grid current
1.1 mA
ClassA 90V
Plate resistance
240000 Ohm
ClassA 90V
Transconductance
1400 uS
ClassA 90V

Data set 04

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Filament Voltage
2 V
Nominal
Filament Current
120 mA
Nominal
Plate Voltage
90 V
ClassA1;PlateVoltage=90V
Screen Voltage
90 V
ClassA1;PlateVoltage=90V
Control Grid Voltage
-3 V
ClassA1;PlateVoltage=90V
Plate Current
4 mA
ClassA1;PlateVoltage=90V
Screen Current
1.1 mA
ClassA1;PlateVoltage=90V
Load Resistance
20000 ohm
ClassA1;PlateVoltage=90V
Total Harmonic Distortion
6 %
ClassA1;PlateVoltage=90V
Power Output
0.11 W
ClassA1;PlateVoltage=90V
Plate Voltage
135 V
ClassA1;PlateVoltage=135V
Screen Voltage
135 V
ClassA1;PlateVoltage=135V
Control Grid Voltage
-4.5 V
ClassA1;PlateVoltage=135V
Plate Current
8 mA
ClassA1;PlateVoltage=135V
Screen Current
2.4 mA
ClassA1;PlateVoltage=135V
Load Resistance
16000 ohm
ClassA1;PlateVoltage=135V
Total Harmonic Distortion
5 %
ClassA1;PlateVoltage=135V
Power Output
0.31 W
ClassA1;PlateVoltage=135V
Plate Voltage
180 V
ClassAB1;PushPull;TwoTubes
Screen Voltage
180 V
ClassAB1;PushPull;TwoTubes
Control Grid Voltage
-7.5 V
ClassAB1;PushPull;TwoTubes
PeakAFSignalVoltageGridToGrid
15 V
ClassAB1;PushPull;TwoTubes
Zero Signal Plate Current
19 mA
ClassAB1;PushPull;TwoTubes
Zero Signal Screen Current
5.5 mA
ClassAB1;PushPull;TwoTubes
Maximum Signal Plate Current
21 mA
ClassAB1;PushPull;TwoTubes
Maximum Signal Screen Current
7 mA
ClassAB1;PushPull;TwoTubes
PlateToPlateLoadResistance
20000 ohm
ClassAB1;PushPull;TwoTubes
Total Harmonic Distortion
4.5 %
ClassAB1;PushPull;TwoTubes
Power Output
1.25 W
ClassAB1;PushPull;TwoTubes

Characteristic

Plate Resistance
240000 ohm
ClassA1;PlateVoltage=90V
Transconductance
1400 uS
ClassA1;PlateVoltage=90V
Plate Resistance
200000 ohm
ClassA1;PlateVoltage=135V
Transconductance
1700 uS
ClassA1;PlateVoltage=135V