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Power - Beam (NOT sweep) ·BeamPower

6L6GB

Enhanced 6L6-family beam-power tube for audio output stages, offering increased dissipation and voltage capability for higher-power Class A and push-pull amplifiers.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
7AC
Socket code
IO
Base pins
8
Nominal heater
6.3 V / 900 mA

Description

The 6L6GB is a BeamPower intended for beam-power audio output service. Published ratings, characteristics and typical operating data from the supplied datasheet were captured.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
7AC
Socket code
IO
Base pins
8
Nominal heater voltage
6.3 V
Nominal heater current
900 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

7AC - Terminal pinout

Electrical assignments shared by every tube using this base designation.

TerminalSectionConnectionEvidence
PIN1Pin 1—NCVerified

12L6GT/25L6GT manufacturer basing, 7AC

PIN2Pin 2—H — HeaterVerified

12L6GT/25L6GT manufacturer basing, 7AC

PIN3Pin 3AP — Plate (Anode)Verified

12L6GT/25L6GT manufacturer basing, 7AC

PIN4Pin 4AG2 — Screen GridVerified

12L6GT/25L6GT manufacturer basing, 7AC

PIN5Pin 5AG1 — Control GridVerified

12L6GT/25L6GT manufacturer basing, 7AC

PIN7Pin 7—H — HeaterVerified

12L6GT/25L6GT manufacturer basing, 7AC

PIN8Pin 8ABP — Beam-Forming PlateGroup AC8Verified

12L6GT/25L6GT manufacturer basing, 7AC

PIN8Pin 8AK — CathodeGroup AC8Verified

12L6GT/25L6GT manufacturer basing, 7AC

Section ratings

1 physical section, each with unique specifications.

Section 1

Beam Power

X-ray radiationInterelectrode capacitances
Plate resistance
22500 Ω
Transconductance
0.006 S
Max plate voltage
400 V
Max screen voltage
270 V
Max plate dissipation
22 W
Max screen dissipation
2.5 W

Promoted from printed maximum-rating/characteristic columns; additional published operating points and capacitances retained as parameters.

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

Beam Power

Other

  • Plate voltage

    350 V

    ClassA

  • Screen voltage

    250 V

    ClassA

  • Control-grid voltage

    -18 V

    ClassA

  • Plate current

    54 mA

    ClassA

  • Screen current

    2.5 mA

    ClassA

  • Load resistance

    5000 Ω

    PushPull TwoTubes

  • Power output

    17.5 W

    PushPull TwoTubes

Characteristic

  • Plate resistance

    33000 Ω

    ClassA

  • Transconductance

    5200 µS

    ClassA

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

  • Heater voltage

    6.3 V

  • Heater current

    900 mA

  • Plate voltage

    300400 V

    Typical operating conditions

  • Plate current

    795566 mA

    Typical operating conditions

Data set 03

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

  • Plate voltage

    250 V

    ClassA

  • Screen voltage

    250 V

    ClassA

  • Power_output

    6.5 W

    ClassA,OneTube

  • Power_output

    26.5 W

    PushPull,TwoTubes

Characteristic

  • Transconductance

    5300 uS

    ClassA

  • Plate resistance

    35000 ohm

    ClassA

  • Plate_current

    72 mA

    ClassA,OneTube

  • Amplification_factor

    8

    TriodeConnection

Capacitance

  • Input capacitance

    3 pF

    Section1

  • Output capacitance

    3 pF

    Section1