6GM8

Low-voltage frame-grid twin triode designed for RF amplifier and mixer service, capable of useful operation from unusually low plate supplies in compact receiver front ends.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 9DE
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 330 mA

Description

6GM8 is listed in the supplied Amperex material as a low-voltage frame-grid twin triode RF amplifier/mixer. Published operating conditions and electrical characteristics were captured from the supplied tables.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 9DE
Socket code: B9A
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 330 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

9DE - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN12P	B	P — Plate (Anode) EIA chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DE
PIN22G1	B	G1 — Control Grid EIA chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DE
PIN32K	B	K — Cathode EIA chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DE
PIN4H	—	H — Heater EIA chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DE
PIN5H	—	H — Heater EIA chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DE
PIN61P	A	P — Plate (Anode) EIA chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DE
PIN71G1	A	G1 — Control Grid EIA chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DE
PIN81K	A	K — Cathode EIA chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DE
PIN9IS	A	IS — Internal Screen EIA chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9DE

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 2100 Ω
Transconductance: 0.0026 S
Amplification factor: 14
Max plate voltage: 30 V
Max plate dissipation: 0.6 W

Published maximum ratings and general characteristics promoted from the supplied datasheet.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 2100 Ω
Transconductance: 0.0026 S
Amplification factor: 14
Max plate voltage: 30 V
Max plate dissipation: 0.6 W

Second identical physical triode section; added to align rows with SectionCount.

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

1953 Amperex

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Heater/Filament Voltage
6.3 V
Heater/Filament Current
330 mA
Maximum Plate Voltage
30 V
Maximum Plate Dissipation
0.6 W

Characteristics

Transconductance
2600 uS
Amplification Factor
14

Data set 02

1963 Amperex Condensed

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Heater voltage
6.3 V
Published heater rating
Heater current
330 mA
Published heater rating
Amplification factor
14
RFAmplifier
Plate resistance
2100 ohm
RFAmplifier
Mixer amplification factor
5
MixerSection
Mixer transconductance
2000 µS
MixerSection

Other

RF-amplifier grid voltage
0 V
RFAmplifier
RF-amplifier plate current
7.5 mA
RFAmplifier
Mixer plate voltage
25 V
MixerSection
Mixer plate current
2.6 mA
MixerSection