Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Voltage - Dual Triode (similar) ·Triode-Triode

6679

Industrial high-mu twin triode intended for mobile communications equipment, with documented mixer, oscillator, and amplifier applications suited to compact communications circuitry.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
-
Socket code
B9A
Base pins
9
Nominal heater
12.6 V / 150 mA

Description

Industrial high-mu twin triode for mixer, oscillator, and amplifier service in mobile communications equipment.

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
12.6 V
Nominal heater current
150 mA
Parallel heater voltage
6.3 V
Parallel heater current
300 mA
Series capable
Yes

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
10900 Ω
Transconductance
0.0055 S
Amplification factor
60
Max plate voltage
330 V
Max plate dissipation
2.8 W

Representative electrical row for repeated identical physical sections.

Section 2

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
10900 Ω
Transconductance
0.0055 S
Amplification factor
60
Max plate voltage
330 V
Max plate dissipation
2.8 W

Second physical triode restored under current one-row-per-physical-section 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

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Plate Resistance

    10900 ohm

  • Transconductance

    5500 µS

  • Amplification Factor

    60

Other

  • Maximum Plate Voltage

    330 V

  • Maximum Plate Dissipation

    2.8 W

  • Heater Voltage Series

    12.6 V

  • Heater Current Series

    150 mA

  • Heater Voltage Parallel

    6.3 V

  • Heater Current Parallel

    300 mA

Data set 02

1960 RCA Industrial and Communications Types

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Heater Voltage

    12.6 V

  • Heater Current

    150 mA

  • EquivalentType

    12AT7

    RenewalUse

  • FrequencyConverterMaximumFrequency

    300 MHz

Data set 03

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Heater voltage

    12.6 V

    Nominal

  • Heater current

    150 mA

    Nominal

  • Plate voltage

    330 V

    Published operating table; OperatingPoint1

  • Plate voltage

    250 V

    Published operating table; OperatingPoint1

Characteristic

  • Plate current

    10 mA

    Published operating table; OperatingPoint1

Data set 04

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Heater Voltage

    12.6 V

  • Heater Current

    150 mA

  • EquivalentElectricalType

    12AT7

  • Plate Voltage

    250 V

  • Grid Voltage

    -2 V

  • Plate Current

    10 mA

  • Transconductance

    5500 uS

  • Plate Resistance

    15000 ohm

  • Amplification Factor

    60

  • FrequencyConverterMaximumFrequency

    300 MHz

Data set 05

1966 Tung Sol Electronic Tubes 4 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

  • AVERAGE VALUES -VOLTAGE — published value 1

    12.6 V

    Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.

  • AVERAGE VALUES -VOLTAGE — published value 2

    6.3 V

    Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.

  • CURRENT — published value 1

    150 mA

    Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.

  • CURRENT — published value 2

    300 mA

    Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.

  • VOLTAGE OPERATION — published value 1

    12.6 V

    Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.

  • VOLTAGE OPERATION — published value 2

    2.5 V

    Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.

  • VOLTAGE OPERATION — published value 3

    6.3 V

    Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.

  • VOLTAGE OPERATION — published value 4

    1.3 V

    Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.

  • PLATE VOLTAGE

    330 V

    Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.

  • POSITIVE DC GRID VOLTAGE

    0 V

    Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.

  • NEGATIVE DC GRID VOLTAGE

    55 V

    Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.

  • PLATE DISSIPATION

    2.8 W

    Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.

  • PLATE VOLTAGE

    250 V

    Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.

  • CATHODE -BIAS RESISTOR

    200 ohm

    Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.

  • PLATE CURRENT

    10 mA

    Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.

  • AMPLIFICATION FACTOR

    60

    Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.

  • PLATE RESISTANCE, APPROX.

    10900 ohm

    Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.

  • AT REDUCED HEATER VOLTAGE, EACH SECTION

    4400 uS

    Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.

  • Plate resistance

    10900 ohm

    Promoted section value from the supplied datasheet.

  • Amplification factor

    60

    Promoted section value from the supplied datasheet.

Other

  • Maximum plate voltage

    330 V

    Promoted section value from the supplied datasheet.

  • Maximum plate dissipation

    2.8 W

    Promoted section value from the supplied datasheet.

Data set 06

1971 RCA HB3 Binder 3 of 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Heater voltage

    6.3 V

    Nominal

  • Heater current

    300 mA

    Nominal

  • Heater voltage series

    12.6 V

    Series

  • Heater current series

    150 mA

    Series

  • Heater voltage parallel

    6.3 V

    Parallel

  • Heater current parallel

    300 mA

    Parallel

  • Maximum plate voltage

    330 V

    Promoted published value

  • Maximum plate dissipation

    2.8 W

    Promoted published value

  • PLATE VOLTAGE

    330 V

    Maximum Ratings, Design-Nazimum Values:

  • PLATE DISSIPATION

    2.8 W

    Maximum Ratings, Design-Nazimum Values:

  • respect to cathode

    100 V

    Maximum Ratings, Design-Nazimum Values:

  • much as

    35 V

    Maximum Ratings, Design-Nazimum Values:

  • one minute off, heater

    135 V

    Maximum Ratings, Design-Nazimum Values:

  • With heater volts =

    10 V

    Maximum Ratings, Design-Nazimum Values:

  • = 250, and cathode resistor (ohms) bypassed = 200

    200 ohm

    Maximum Ratings, Design-Nazimum Values:

Characteristic

  • Plate resistance

    10900 ohm

    Promoted published value

  • Transconductance

    5500 uS

    Promoted published value

  • Amplification factor

    60

    Promoted published value

  • Voltage

    20 V

  • Plate Supply Voltage

    250 V

    Direct Interelectrode Capacitances (Approx.):

  • Cathode Resistor

    200 ohm

    Direct Interelectrode Capacitances (Approx.):

  • Amplification Factor

    60 A

    Direct Interelectrode Capacitances (Approx.):

  • Plate Resistance (Approx.)

    10900 ohm

    Direct Interelectrode Capacitances (Approx.):

  • Transconductance

    5500 uS

    Direct Interelectrode Capacitances (Approx.):

  • Plate Current

    10 mA

    Direct Interelectrode Capacitances (Approx.):

  • Grid Voltage (Approx.) for plate µa =

    -12 V

    Direct Interelectrode Capacitances (Approx.):

Data set 07

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

  • Grid to Plate (Each unit)

    1.5 pF

    Capacitance

  • Grid to Cathode and Heater (Each unit)

    2.2 pF

    Capacitance

  • Cathode to Plate (Each unit)

    0.2 pF

    Capacitance

  • Cathode to Grid and Heater (Each unit)

    4.6 pF

    Capacitance

  • Plate to Grid and Heater (Each unit)

    1.8 pF

    Capacitance

  • Heater to Cathode (Each unit)

    2.4 pF

    Capacitance

Other

  • Negative bias value

    55 V

    MaximumRatings

  • Positive bias value

    0 V

    MaximumRatings

  • Plate Dissipation

    2.8 W

    MaximumRatings

  • Average Value (Each unit)

    4400 uS

    ReducedHeaterPerformance

Characteristic

  • Plate Supply Voltage

    250 V

    Characteristics

  • Cathode-Bias Resistor

    200 ohm

    Characteristics

  • Plate Resistance (Approx.)

    10900 ohm

    Characteristics

  • Grid Voltage (Approx.) for plate current of 10 /xA

    12 V

    Characteristics

  • Plate Current

    10 mA

    Characteristics