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Voltage - Dual Triode (similar) ·Triode-Triode

6SL7GT

High-mu twin triode for resistance-coupled voltage amplification and phase inversion, widely applicable to low-level Class-A signal stages.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
RETMA 8BD
Socket code
IO
Base pins
8
Nominal heater
6.3 V / 300 mA

Description

High-mu twin triode used as a phase inverter and in resistance-coupled amplifier circuits. Explicit heater variant/co-designation of 12SL7GT in the approved source.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
RETMA 8BD
Socket code
IO
Base pins
8
Nominal heater voltage
6.3 V
Nominal heater current
300 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

RETMA 8BD - 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
Plate resistance
44000 Ω
Transconductance
0.0016 S
Amplification factor
70
Max plate voltage
300 V
Max plate dissipation
1 W

Representative row for each identical triode section.

Section 2

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
44000 Ω
Transconductance
0.0016 S
Amplification factor
70
Max plate voltage
300 V
Max plate dissipation
1 W

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

1948 Brimar Radio Valve Manual

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Heater Voltage

    6.3 V

  • Heater Current

    300 mA

Data set 02

1958 Brimar Radio Valve No 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Heater Voltage

    6.3 V

  • Heater Current

    300 mA

Data set 03

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Maximum plate voltage

    300 V

    Published handbook rating

  • Plate voltage

    250 V

    ClassA OperatingPoint1

  • Control-grid bias

    2 V

    ClassA OperatingPoint1

  • Plate current

    2.3 mA

    ClassA OperatingPoint1

Characteristic

  • Plate resistance

    44000 ohm

    ClassA OperatingPoint1

  • Transconductance

    1600 µS

    ClassA OperatingPoint1

  • Amplification factor

    70

    ClassA OperatingPoint1

  • Heater voltage

    6.3 V

    Published heater rating

  • Heater current

    300 mA

    Published heater rating

Data set 04

1960 RCA Industrial and Communications Types

Published operating points and test conditions from this source.

SECTION 1

Triode

Application

  • Application

    Voltage amplifier / phase inverter

Data set 05

1961 Ferranti Technical Handbook

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

  • Plate Voltage

    250 V

    Each section

  • Plate Current

    2.3 mA

    Each section

  • Transconductance

    1600 uS

    Each section

  • Plate Resistance

    44000 ohm

    Each section

  • Amplification Factor

    70 ratio

    Each section

Data set 06

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Plate Voltage

    250 V

    ClassA1;EachUnit

Characteristic

  • Plate Current

    2.3 mA

    ClassA1;EachUnit

Data set 07

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Plate voltage

    250 V

    ClassA

Characteristic

  • Transconductance

    1600 uS

    ClassA

  • Plate resistance

    44000 ohm

    ClassA

  • Amplification factor

    70

    ClassA

Capacitance

  • Input capacitance

    3 pF

    Section1

  • Output capacitance

    3 pF

    Section1

Data set 08

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Plate Voltage

    250 V

    ClassA

  • Grid Voltage

    -2 V

    ClassA

Characteristic

  • Plate Current

    2.3 mA

    ClassA

Data set 09

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

  • Voltage

    6.3 V

    Published datasheet value; multiple values represent separate source-table limits or conditions.

  • Current

    300 mA

    Published datasheet value; multiple values represent separate source-table limits or conditions.

  • Grid to plate — published value 1

    2.8

    Published datasheet value; multiple values represent separate source-table limits or conditions.

  • Grid to plate — published value 2

    2.8

    Published datasheet value; multiple values represent separate source-table limits or conditions.

  • heater — published value 1

    3

    Published datasheet value; multiple values represent separate source-table limits or conditions.

  • heater — published value 2

    3.4

    Published datasheet value; multiple values represent separate source-table limits or conditions.

  • heater — published value 1

    3.8

    Published datasheet value; multiple values represent separate source-table limits or conditions.

  • heater — published value 2

    3.2

    Published datasheet value; multiple values represent separate source-table limits or conditions.

  • Pin 1 -Grid of — published value 1

    1

    Published datasheet value; multiple values represent separate source-table limits or conditions.

  • Pin 1 -Grid of — published value 2

    5

    Published datasheet value; multiple values represent separate source-table limits or conditions.

  • Pin 2 -Plate of — published value 1

    2

    Published datasheet value; multiple values represent separate source-table limits or conditions.

  • Pin 2 -Plate of — published value 2

    6

    Published datasheet value; multiple values represent separate source-table limits or conditions.

  • Pin 3 -Cathode of — published value 1

    3

    Published datasheet value; multiple values represent separate source-table limits or conditions.

  • Pin 3 -Cathode of — published value 2

    7

    Published datasheet value; multiple values represent separate source-table limits or conditions.

  • Unit No.2

    8

    Published datasheet value; multiple values represent separate source-table limits or conditions.

  • Pin 4 -Grid of

    4

    Published datasheet value; multiple values represent separate source-table limits or conditions.

  • Plate Voltage

    250 V

    Published datasheet value; multiple values represent separate source-table limits or conditions.

  • Grid Voltage

    -2 V

    Published datasheet value; multiple values represent separate source-table limits or conditions.

  • Plate Resistance (Approx.)

    44000 ohm

    Published datasheet value; multiple values represent separate source-table limits or conditions.

  • Transconductance

    1600

    Published datasheet value; multiple values represent separate source-table limits or conditions.

  • Plate Current

    2.3 mA

    Published datasheet value; multiple values represent separate source-table limits or conditions.

Other

  • PLATE VOLTAGE

    300 V

    Published datasheet value; multiple values represent separate source-table limits or conditions.

  • Positive bias value

    0 V

    Published datasheet value; multiple values represent separate source-table limits or conditions.

  • PLATE DISSIPATION

    1 mA

    Published datasheet value; multiple values represent separate source-table limits or conditions.

  • Heater negative with respect to cathode

    90 V

    Published datasheet value; multiple values represent separate source-table limits or conditions.

  • Heater positive with respect to cathode

    90 V

    Published datasheet value; multiple values represent separate source-table limits or conditions.

Data set 10

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Peak Heater-Cathode Voltage

    90 V

    TypicalOperation;PublishedValue1

  • Peak Heater-Cathode Voltage

    90 V

    TypicalOperation;PublishedValue2

  • Plate Voltage

    300 V

    MaximumRating

  • Grid Voltage. Positive-bias value

    0 V

    MaximumRating

  • Plate Dissipation

    1 W

    MaximumRating

  • Maximum Plate Voltage

    300 V

    Section1

  • Maximum Plate Dissipation

    1 W

    Section1

Capacitance

  • Grid to Plate

    2.8 pF

    Capacitance;PublishedValue1

  • Grid to Plate

    2.8 pF

    Capacitance;PublishedValue2

  • Grid to Cathode and Heater

    3.4 pF

    Capacitance

  • Plate to Cathode and Heater

    3.2 pF

    Capacitance

Characteristic

  • Plate Voltage

    250 V

    Characteristic

  • Grid Voltage

    -2 V

    Characteristic

  • Plate Resistance (Approx. t

    44000 ohm

    Characteristic

  • Transconductance

    11500 uS

    Characteristic

  • Plato Current

    2 mA

    Characteristic

  • Plate Resistance

    44000 ohm

    Section1

  • Amplification Factor

    70

    Section1