6L7G

Glass-envelope pentagrid heptode for radio mixer, first-detector, modulation, and controlled-amplifier service with a separate oscillator.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 7T
Socket code: IO
Base pins: 8
Nominal heater: 6.3 V / 300 mA

Description

Pentagrid modulator and amplifier tube.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 7T
Socket code: IO
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 300 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

7T - 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: 0.0011 S
Max plate voltage: 300 V
Max screen voltage: 150 V

Promoted from printed maximum-rating/characteristic columns; additional published operating points and capacitances 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 plate voltage
250 V
Published datasheet rating
Maximum screen voltage
150 V
Published datasheet rating
Plate voltage
250 V
ClassA
Screen voltage
100 V
ClassA
Screen current
6.5 mA
ClassA

Characteristic

Plate resistance
800000 ohm
Published datasheet characteristic
Transconductance
1100 µS
Published datasheet characteristic
Amplification factor
880
Published datasheet characteristic
Heater voltage
6.3 V
Published heater rating
Heater current
300 mA
Published heater rating

Data set 02

1948 Brimar Radio Valve Manual

Published operating points and test conditions from this source.

SECTION 1

Heptode

Characteristic

Heater Voltage
6.3 V
Heater Current
300 mA
Conversion Conductance
370 uS
PlateVoltage=250V;ScreenVoltage=100V

Data set 03

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Heptode

Other

Plate voltage
250 V
ClassA
Screen voltage
100 V
ClassA
Control-grid voltage
-3 V
ClassA
Plate current
5.3 mA
ClassA
Screen current
6.5 mA
ClassA

Characteristic

Plate resistance
600000 Ω
ClassA
Transconductance
1100 µS
ClassA