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Power - TV Vertical Output ·Triode-Triode

6GL7

Dual triode intended for television vertical-deflection service, combining oscillator/driver and power-output functions where applicable. Manufacturer data emphasize vertical-sweep operation, pulse-voltage capability, and the stronger section’s current and dissipation requirements.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
8BD
Socket code
IO
Base pins
8
Nominal heater
6.3 V / 1.05 A

Description

Dissimilar dual triode for television vertical oscillator and vertical-deflection output amplifier service.

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
1.05 A
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

8BD - Terminal pinout

Electrical assignments shared by every tube using this base designation.

TerminalSectionConnectionEvidence
PIN12G1BG1 — Control Grid

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 8BD

PIN22PBP — Plate (Anode)

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 8BD

PIN32KBK — Cathode

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 8BD

PIN41G1AG1 — Control Grid

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 8BD

PIN51PAP — Plate (Anode)

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 8BD

PIN61KAK — 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
30000 Ω
Transconductance
0.0022 S
Amplification factor
66
Max plate voltage
350 V
Max plate dissipation
1 W
Max cathode current
20 mA

Vertical-oscillator section.

Section 2

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
780 Ω
Transconductance
0.0064 S
Amplification factor
5
Max plate voltage
550 V
Max plate dissipation
10 W
Max cathode current
50 mA

Vertical-deflection amplifier section; 1500 V pulse plate rating preserved as parameter.

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

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Plate resistance

    30000 ohm

  • Transconductance

    1600 uS

  • Amplification factor

    66

Other

  • Maximum plate voltage

    350 V

  • Maximum plate dissipation

    1 W

  • Heater voltage

    6.3 V

  • Heater current

    1.05 A

  • Typical plate voltage

    275 V

  • Typical plate current

    13 mA

SECTION 2

Triode

Characteristic

  • Plate resistance

    780 ohm

  • Transconductance

    6400 uS

  • Amplification factor

    5

Other

  • Maximum plate voltage

    550 V

  • Maximum plate dissipation

    10 W

  • Maximum cathode current

    50 mA

  • Heater voltage

    6.3 V

  • Heater current

    1.05 A

  • Typical plate voltage

    175 V

  • Typical plate current

    46 mA

Data set 02

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Typical Plate Voltage

    250 V

    Section1

Characteristic

  • Typical Plate Current

    2 mA

    Section1

SECTION 2

Triode

Other

  • Peak Positive Pulse Plate Voltage

    1500 V

    Section2

  • Typical Plate Voltage

    175 V

    Section2

Characteristic

  • Typical Plate Current

    46 mA

    Section2

Data set 03

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Heater voltage

    6.3 V

  • Heater current

    1.05 A

  • Plate voltage

    250 V

    Section1;ClassA

  • Plate current

    2 mA

    Section1;ClassA

  • Maximum plate voltage

    350 V

    Section1

Characteristic

  • Plate resistance

    30000 ohm

    Section1

  • Transconductance

    2200 uS

    Section1

  • Amplification factor

    66

    Section1

SECTION 2

Triode

Other

  • Plate voltage

    175 V

    Section2;ClassA

  • Plate current

    46 mA

    Section2;ClassA

  • Maximum plate voltage

    550 V

    Section2

  • Peak positive-pulse plate voltage

    1500 V

    Section2;VerticalDeflection

Characteristic

  • Plate resistance

    780 ohm

    Section2

  • Transconductance

    6400 uS

    Section2

  • Amplification factor

    5

    Section2