6EH8

Miniature sharp-cutoff pentode plus triode designed primarily for combined television oscillator and mixer frequency-converter service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 9JG
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 450 mA

Description

The 6EH8 is a miniature tube containing a sharp-cutoff pentode and a triode in one envelope, intended primarily for combined triode-oscillator and pentode-mixer service in television receivers.

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: 9JG
Socket code: B9A
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 450 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

9JG - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1Base Pin	A	G3 — Suppressor GridGroup 9JG1 Original label 1G3; manufacturer verification pending	Unverified EIA Base Connections printed p133, 9JG
PIN1Base Pin	—	IS — Internal ScreenGroup 9JG1 Original label IS; manufacturer verification pending	Unverified EIA Base Connections printed p133, 9JG
PIN1Base Pin	—	K — CathodeGroup 9JG1 Original label K; manufacturer verification pending	Unverified EIA Base Connections printed p133, 9JG
PIN2Base Pin	B	G1 — Control Grid Original label 2G1; manufacturer verification pending	Unverified EIA Base Connections printed p133, 9JG
PIN3Base Pin	B	P — Plate (Anode) Original label 2P; manufacturer verification pending	Unverified EIA Base Connections printed p133, 9JG
PIN4Base Pin	—	H — Heater Original label H; manufacturer verification pending	Unverified EIA Base Connections printed p133, 9JG
PIN5Base Pin	—	H — Heater Original label H; manufacturer verification pending	Unverified EIA Base Connections printed p133, 9JG
PIN6Base Pin	A	G3 — Suppressor GridGroup 9JG6 Original label 1G3; manufacturer verification pending	Unverified EIA Base Connections printed p133, 9JG
PIN6Base Pin	—	IS — Internal ScreenGroup 9JG6 Original label IS; manufacturer verification pending	Unverified EIA Base Connections printed p133, 9JG
PIN6Base Pin	—	K — CathodeGroup 9JG6 Original label K; manufacturer verification pending	Unverified EIA Base Connections printed p133, 9JG
PIN7Base Pin	A	G1 — Control Grid Original label 1G1; manufacturer verification pending	Unverified EIA Base Connections printed p133, 9JG
PIN8Base Pin	A	G2 — Screen Grid Original label 1G2; manufacturer verification pending	Unverified EIA Base Connections printed p133, 9JG
PIN9Base Pin	A	P — Plate (Anode) Original label 1P; manufacturer verification pending	Unverified EIA Base Connections printed p133, 9JG

Section ratings

2 physical sections, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 170000 Ω
Transconductance: 0.0065 S
Max plate voltage: 300 V
Max screen voltage: 300 V
Max plate dissipation: 2.8 W
Max screen dissipation: 0.5 W
Rectifier max heater-cathode voltage: 200 V
Rectifier warm-up time: 11 s

Pentode section; screen supply maximum 300 V and screen voltage governed by rating chart.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 7000 Ω
Transconductance: 0.0075 S
Amplification factor: 40
Max plate voltage: 300 V
Max plate dissipation: 2.5 W
Rectifier max heater-cathode voltage: 200 V
Rectifier warm-up time: 11 s

Triode section.

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

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
125 V
PentodeSection;Mixer
Grid 2 voltage
125 V
PentodeSection;Mixer
Plate current
12 mA
PentodeSection;Mixer
Grid 2 current
4 mA
PentodeSection;Mixer

Characteristic

Heater warm-up time
11 s
WholeTube

SECTION 2

Triode

Other

Plate voltage
125 V
TriodeSection;Oscillator
Plate current
13.5 mA
TriodeSection;Oscillator
Grid 1 voltage
-1 V
TriodeSection;Oscillator

Data set 02

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Plate Voltage
125 V
PentodeSection
Plate Current
12 mA
PentodeSection

SECTION 2

Triode

Characteristic

Plate Voltage
125 V
TriodeSection
Plate Current
13.5 mA
TriodeSection