6G8G

Diode variable-mu pentode for detector and gain-controlled receiver amplification. The pentode supports automatic gain regulation while the associated diode supplies complementary detector or control-voltage rectification.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: IO
Base pins: 8
Nominal heater: 6.3 V / 300 mA

Description

The BRIMAR 6G8G is a double-diode vari-mu pentode with a 6.3 V, 0.3 A heater and published pentode characteristics at 250 V anode voltage.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
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

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

2 physical sections, each with unique specifications.

Section 1

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Published ratings and characteristics promoted where clearly stated; identical repeated diode/triode sections compressed where applicable.

Section 2

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 800000 Ω
Transconductance: 0.001 S
Max plate voltage: 250 V
Max screen voltage: 100 V

Published ratings and characteristics promoted where clearly stated; identical repeated diode/triode sections compressed where applicable.

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

1940 RCA

Published operating points and test conditions from this source.

SECTION 1

Diode

Characteristics

Heater voltage
6.3 V
Published nominal value
Heater current
300 mA
Published nominal value

Capacitance

Pentode grid-to-plate capacitance
0.007 pF
With shield can

Other

Application
Detector, AVC, RF/IF amplifier
Published function

SECTION 2

Pentode

Characteristics

Heater voltage
6.3 V
Published nominal value
Heater current
300 mA
Published nominal value

Data set 02

1948 Brimar Radio Valve Manual

Published operating points and test conditions from this source.

SECTION 2

Pentode

Characteristics

Anode Voltage
250 V
Anode Current
6.5 mA
Screen Voltage
100 V
Screen Current
1.4 mA
Control Grid Voltage
-3 V
Control Grid Voltage for Low Transconductance
-40 V
Transconductance=0.005mA/V