6JX8

Triode-heptode combination for oscillator, mixer, and related receiving applications. The heptode performs frequency conversion while the relatively low-resistance triode provides local oscillation or stronger current drive.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 300 mA

Description

6JX8 is listed in the supplied Amperex material as a triode-heptode for pulse separator, noise inverter and sync-amplifier service. 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: -
Socket code: B9A
Base pins: 9
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

Heptode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0022 S

Published typical operating conditions, UHF/deflection ratings, and descriptive application reviewed.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 3700 Ω
Amplification factor: 16

Published typical operating conditions, UHF/deflection ratings, and descriptive application reviewed.

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

1963 Amperex Condensed

Published operating points and test conditions from this source.

SECTION 1

Heptode

Characteristic

Heater voltage
6.3 V
Published heater rating
Heater current
300 mA
Published heater rating
Transconductance
2200 µS
HeptodeSection

Other

Heptode plate voltage
135 V
HeptodeSection
Heptode screen voltage
14 V
HeptodeSection
Heptode plate current
1.7 mA
HeptodeSection
Heptode screen current
0.9 mA
HeptodeSection

SECTION 2

Triode

Other

Triode plate voltage
60 V
TriodeSection
Triode plate current
2 mA
TriodeSection

Characteristic

Triode amplification factor
16
TriodeSection