6BX8

Twin triode designed for low-voltage VHF cascode-amplifier service, providing RF gain in television and related high-frequency receiving equipment.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 400 mA

Description

6BX8 is a DualTriode device. Twin triode for low-voltage VHF cascode amplifier service; electrically related to 4BX8 except for heater ratings and warm-up time.

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: 400 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

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0067 S
Amplification factor: 25
Max plate voltage: 150 V
Max plate dissipation: 2 W
Max cathode current: 20 mA

Representative specification for repeated identical sections.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0067 S
Amplification factor: 25
Max plate voltage: 150 V
Max plate dissipation: 2 W
Max cathode current: 20 mA

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

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate Voltage
66 V
Published operating/characteristic table
Grid Voltage
-1 V
Published operating/characteristic table

Characteristic

Plate Current
9 mA
Published operating/characteristic table
Transconductance
6700 uS
Published operating/characteristic table
Amplification Factor
25
Published operating/characteristic table

Data set 02

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
65 V
EachUnit; Cascode
Plate current
9 mA
EachUnit; Cascode

Characteristic

Amplification factor
25
EachUnit
Transconductance
6700 uS
EachUnit