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

Voltage - Dual Triode (similar) ·Triode-Triode

6680

Industrial medium-mu twin triode intended for mobile communications equipment, particularly phase-inverter and push-pull amplifier circuits requiring two complementary triode sections.

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

Description

Industrial medium-mu twin triode for phase-inverter or push-pull 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
7700 Ω
Transconductance
0.0022 S
Amplification factor
17
Max plate voltage
330 V
Max plate dissipation
3 W

Representative electrical row for repeated identical physical sections.

Section 2

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
7700 Ω
Transconductance
0.0022 S
Amplification factor
17
Max plate voltage
330 V
Max plate dissipation
3 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

    7700 ohm

  • Transconductance

    2200 µS

  • Amplification Factor

    17

Other

  • Maximum Plate Voltage

    330 V

  • Maximum Plate Dissipation

    3 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

    12AU7A

    RenewalUse

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

    100 V

    Published operating table; OperatingPoint1

  • Plate voltage

    250 V

    Published operating table; OperatingPoint2

Characteristic

  • Transconductance

    3100 uS

    Published operating table; OperatingPoint1

  • Transconductance

    2200 uS

    Published operating table; OperatingPoint2

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

    12AU7

  • Plate Voltage

    250 V

  • Grid Voltage

    -8.5 V

  • Plate Current

    10.5 mA

  • Transconductance

    2200 uS

  • Plate Resistance

    7700 ohm

  • Amplification Factor

    17

  • ReducedHeaterTransconductance

    1750 uS

    HeaterVoltage=10V

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

    12.62 V

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

  • VOLTAGE OPERATION — published value 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.

  • PLATE DISSIPATION

    3 W

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

  • WITH FIXED BIAS

    0.25 ohm

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

  • WITH CATHODE BIAS

    1 ohm

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

  • PLATE VOLTAGE — published value 1

    100 V

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

  • PLATE VOLTAGE — published value 2

    250 V

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

  • GRID VOLTAGE — published value 1

    0 V

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

  • GRID VOLTAGE — published value 2

    -8.5 V

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

  • PLATE CURRENT — published value 1

    11.8 mA

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

  • PLATE CURRENT — published value 2

    10.5 mA

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

  • TRANSCONDUCTANCE — published value 1

    3100 uS

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

  • TRANSCONDUCTANCE — published value 2

    2200 uS

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

  • AMPLIFICATION FACTOR — published value 1

    20

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

  • AMPLIFICATION FACTOR — published value 2

    17

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

  • PLATE RESISTANCE, APPROX. — published value 1

    6500 ohm

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

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

    3 W

    Promoted published value

  • PLATE VOLTAGE

    330 V

    Maximum RatingsE Design-Maximum Values:

  • PLATE DISSIPATION

    3 W

    Maximum RatingsE Design-Maximum Values:

  • to cathode

    200 V

    Maximum RatingsE Design-Maximum Values:

  • For cathode-bias operation

    1 megohm

    Maximum RatingsE Design-Maximum Values:

  • much as

    35 V

    Maximum RatingsE Design-Maximum Values:

Characteristic

  • Plate resistance

    7700 ohm

    Promoted published value

  • Transconductance

    2200 uS

    Promoted published value

  • Amplification factor

    17

    Promoted published value

  • Voltage

    20 V

  • Plate Voltage

    250 V

  • Grid Voltage

    8.5 V

  • Amplification Factor

    17 A

  • Plate Resistance (Approx.)

    7700 ohm

  • Transconductance

    2200 uS

  • Plate Current

    10.5 mA

  • Grid Voltage (Approx.) for plate µa =

    24 V

Data set 07

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Heater Voltage (ac/dc)

    12.6 V

    TypicalOperation

  • Heater Current

    150 mA

    TypicalOperation;PublishedValue1

  • Heater Current

    300 mA

    TypicalOperation;PublishedValue2

  • Plate Voltage

    330 V

    MaximumRatings

  • Grid Voltage, positive-bias value

    0 V

    MaximumRatings

  • For fixed-bias operation

    0.25 megohm

    MaximumCircuitValues

  • For cathode-bias operation

    1 megohm

    MaximumCircuitValues

  • and grid volts

    -8.5 V

    ReducedHeaterPerformance

Capacitance

  • Grid to Plate

    1.5 pF

    Capacitance;PublishedValue1

  • Grid to Plate

    1.5 pF

    Capacitance;PublishedValue2

  • Grid to Cathode and Heater

    1.6 pF

    Capacitance;PublishedValue1

  • Grid to Cathode and Heater

    1.6 pF

    Capacitance;PublishedValue2

  • Plate to Cathode and Heater

    0.4 pF

    Capacitance;PublishedValue1

  • Plate to Cathode and Heater

    0.32 pF

    Capacitance;PublishedValue2

Characteristic

  • Plate Voltage

    100 V

    Characteristics;PublishedValue1

  • Plate Voltage

    250 V

    Characteristics;PublishedValue2

  • Grid Voltage

    0 V

    Characteristics;PublishedValue1

  • Grid Voltage

    -8.5 V

    Characteristics;PublishedValue2

  • Plate Resistance (Approx.)

    6500 ohm

    Characteristics;PublishedValue1

  • Plate Resistance (Approx.)

    7700 ohm

    Characteristics;PublishedValue2

  • Plate Current

    11.8 mA

    Characteristics;PublishedValue1

  • Plate Current

    10.5 mA

    Characteristics;PublishedValue2

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

    -24 V

    Characteristics