6M8GT

Diode-triode-pentode receiving tube combining RF/IF amplification, detector rectification, and audio-frequency amplification.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 3
Base: -
Socket code: IO
Base pins: 8
Nominal heater: 6.3 V / 300 mA

Description

Midget diode-triode-pentode for small AC receivers; the pentode serves as an RF or IF amplifier and the diode-triode section as detector and AF amplifier.

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

3 physical sections, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 200000 Ω
Transconductance: 0.0018 S

Published section data promoted where applicable; additional operating values retained as parameters.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 81000 Ω
Transconductance: 0.0031 S
Amplification factor: 100

Published section data promoted where applicable; additional operating values retained as parameters.

Section 3

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Published section data promoted where applicable; additional operating values 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

1939 Arcturus

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
100 V
Screen-grid voltage
100 V
Control-grid voltage
-3 V

SECTION 2

Triode

Other

Plate voltage
100 V
Control-grid voltage
-1 V
Plate current
0.25 mA