6BL7GT

Twin high-perveance low-mu triode developed for television vertical sweep-generator and deflection-amplifier service. Two independent sections provide substantial current and pulse-voltage capability for vertical scanning and other demanding pulse or driver circuits.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 8BD
Socket code: IO
Base pins: 8
Nominal heater: 6.3 V / 1.5 A

Description

Two independent high-perveance low-mu triodes for combined vertical sweep generator and deflection-amplifier service in television receivers.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 8BD
Socket code: IO
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 1.5 A
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

8BD - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN12G1	B	G1 — Control Grid EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8BD
PIN22P	B	P — Plate (Anode) EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8BD
PIN32K	B	K — Cathode EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8BD
PIN41G1	A	G1 — Control Grid EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8BD
PIN51P	A	P — Plate (Anode) EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8BD
PIN61K	A	K — Cathode EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8BD
PIN7H	—	H — Heater EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8BD
PIN8H	—	H — Heater EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8BD

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 2000 Ω
Transconductance: 0.007 S
Amplification factor: 15
Max plate voltage: 400 V
Max plate dissipation: 10 W
Max cathode current: 60 mA

Representative row for two independent low-mu triodes.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 2000 Ω
Transconductance: 0.007 S
Amplification factor: 15
Max plate voltage: 400 V
Max plate dissipation: 10 W
Max cathode current: 60 mA

Identical second physical Triode section; duplicated from representative section per physical-section-row policy.

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

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
250 V
VerticalDeflection
Control-grid voltage
-9 V
VerticalDeflection
Plate current
40 mA
VerticalDeflection
Positive pulse plate voltage maximum
2000 V
VerticalDeflection
Plate dissipation maximum per section
10 W
VerticalDeflection
Combined plate dissipation maximum
12 W
TwoSections
DC cathode current maximum
60 mA
VerticalDeflection

Characteristic

Plate resistance
2150 Ω
Section1
Transconductance
7000 µS
Section1
Amplification factor
15
Section1

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Peak Positive Pulse Plate Voltage
2000 V
VerticalDeflectionAmplifier
TotalPlateDissipationBothSections
12 W