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Voltage Pentode - Remote Cutoff (single) ·Pentode

12BA6

Variable-mu miniature pentode for RF and IF amplification in AC/DC receivers, providing a broad useful AGC range.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
7CC
Socket code
B7G
Base pins
7
Nominal heater
12.6 V / 150 mA

Description

Variable-mu voltage pentode for RF or IF amplification with series heater.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
7CC
Socket code
B7G
Base pins
7
Nominal heater voltage
12.6 V
Nominal heater current
150 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

7CC - Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
1000000 Ω
Transconductance
0.0044 S
Max plate voltage
300 V
Max screen voltage
150 V
Max plate dissipation
3 W
Max screen dissipation
0.6 W

Pentode section; ratings and characteristics retained in parameter rows where not safely promotable.

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

1958 Brimar Radio Valve No 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • Heater Voltage

    12.6 V

  • Heater Current

    150 mA

Data set 02

1965 Westinghouse Data Book

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • Heater Voltage

    12.6 V

  • Heater Current

    150 mA

  • GridToPlateCapacitanceMaximum

    0.0035 pF

  • Input Capacitance

    5.5 pF

  • Output Capacitance

    5 pF

  • Plate Voltage

    250 V

  • Screen Voltage

    100 V

  • Cathode Resistance

    68 ohm

  • Plate Resistance

    1000000 ohm

  • Transconductance

    4400 uS

  • Plate Current

    11 mA

  • Screen Current

    4.2 mA

  • GridBiasFor40uSTransconductance

    -20 V

    RemoteCutoff

Data set 03

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • HEATER POSITIVE WITH RESPECT TO CATHODE

    200 V

    Published datasheet

  • MAXIMUM PLATE VOLTAGE

    330 V

    Published datasheet

  • MAXIMUM GRID #2 SUPPLY VOLTAGE

    330 V

    Published datasheet

  • MAXIMUM POSITIVE DC GRID #1 VOLTAGE

    0 V

    Published datasheet

  • MAXIMUM NE6ATIVE

    0 V

    Published datasheet; operating column 1

  • MAXIMUM NE6ATIVE

    -55 V

    Published datasheet; operating column 2

  • MAXIMUM PLATE DISSIPATION

    3.4 W

    Published datasheet

  • FOR VGlTA6ES UP TO

    165 W

    Published datasheet; operating column 1

  • FOR VGlTA6ES UP TO

    0.7 W

    Published datasheet; operating column 2

  • CATHODE BIAS RESISTOR

    68 ohm

    Published datasheet; operating column 1

  • CATHODE BIAS RESISTOR

    0 ohm

    Published datasheet; operating column 3

  • Et =

    12.6 V

    Published datasheet

  • Ecz

    100 V

    Published datasheet

  • Ec3

    0 V

    Published datasheet

  • Eb =

    250 V

    Published datasheet

Characteristic

  • PLATE VOLTAGE IOU

    250 V

    Published datasheet

  • GRID #3 VOLTAGE

    0 V

    Published datasheet; operating column 1

  • PLATE RESISTANCE (A PPROX.)

    0.25 Mohm

    Published datasheet; operating column 1

  • PLATE RESISTANCE (A PPROX.)

    1 Mohm

    Published datasheet; operating column 2

  • GRID #2 CURRENT u.!} ly

    2 mA

    Published datasheet

  • GRID #1 VOLTAGE (A PPROX.) FOR Gm = qp ILMHOS

    -20 V

    Published datasheet; operating column 1

  • Plate resistance

    1000000 ohm

    Published datasheet; promoted section value

Data set 04

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Screen Supply Voltage

    300 V

  • Plate Voltage

    100 V

    ClassA; PlateVoltage=100V; ScreenVoltage=100V

  • Screen Voltage

    100 V

    ClassA; PlateVoltage=100V; ScreenVoltage=100V

  • Cathode Bias Resistance

    68 ohm

    ClassA; PlateVoltage=100V; ScreenVoltage=100V

  • Plate Voltage

    250 V

    ClassA; PlateVoltage=250V; ScreenVoltage=100V

  • Screen Voltage

    100 V

    ClassA; PlateVoltage=250V; ScreenVoltage=100V

  • Cathode Bias Resistance

    68 ohm

    ClassA; PlateVoltage=250V; ScreenVoltage=100V

Characteristic

  • Plate Resistance

    250000 ohm

    ClassA; PlateVoltage=100V; ScreenVoltage=100V

  • Transconductance

    4300 uS

    ClassA; PlateVoltage=100V; ScreenVoltage=100V

  • Plate Current

    10.8 mA

    ClassA; PlateVoltage=100V; ScreenVoltage=100V

  • Screen Current

    4.4 mA

    ClassA; PlateVoltage=100V; ScreenVoltage=100V

  • Plate Resistance

    1000000 ohm

    ClassA; PlateVoltage=250V; ScreenVoltage=100V

  • Transconductance

    4400 uS

    ClassA; PlateVoltage=250V; ScreenVoltage=100V

  • Plate Current

    11 mA

    ClassA; PlateVoltage=250V; ScreenVoltage=100V

  • Screen Current

    4.2 mA

    ClassA; PlateVoltage=250V; ScreenVoltage=100V

Capacitance

  • Grid1ToPlateCapacitanceMaximum

    0.0035 pF

    WithExternalShield

  • Input Capacitance

    5.5 pF

    WithExternalShield

  • Output Capacitance

    5.5 pF

    WithExternalShield

Data set 05

1968 Mazda Belvu

Published operating points and test conditions from this source.

SECTION 1

Pentode

Application

  • Application

    RF_IF_Amplifier text

Data set 06

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Yo}tage (AC or DC) ± %

    3 V

    PublishedColumn1

  • Yo}tage (AC or DC) ± %

    10 V

    PublishedColumn2

  • Current at

    6.3 V

  • PLATE VOLTAGE max

    330 V

  • VOLTAGE max

    330 V

  • Negative-bias value max

    55 V

Capacitance

  • Grid No.l to plate. max. max

    0.0035 pF

    PublishedColumn1

  • and heater

    5.5 pF

    PublishedColumn1

  • grid No. , and heater

    5 pF

    PublishedColumn1

  • grid No. , and heater

    5.5 pF

    PublishedColumn2

Characteristics

  • Plate Supply Voltage

    100 V

    PublishedColumn1

  • Plate Supply Voltage

    250 V

    PublishedColumn2

  • Grid-No. Supply Voltage

    100 V

    PublishedColumn1

  • Cathode Resistor

    68 ohm

    PublishedColumn1

  • Plate Resistance (Approx.)

    0.25 Mohm

    PublishedColumn1

  • Plate Resistance (Approx.)

    1 Mohm

    PublishedColumn2

  • Transconductance

    4300 µS

    PublishedColumn1

  • Transconductance

    4400 µS

    PublishedColumn2

  • Plate Current

    10.8 mA

    PublishedColumn1

  • Plate Current

    11 mA

    PublishedColumn2

  • Grid-No. Current

    4.4 mA

    PublishedColumn1

  • Grid-No. Current

    4.2 mA

    PublishedColumn2

Data set 07

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • For fixed-bias operation

    0.25 MΩ

    Published in approved EF93 target datasheet entry; Section1

  • For cathode-bias operation

    1 MΩ

    Published in approved EF93 target datasheet entry; Section1

  • Plate Current

    5 mA

    Published in approved EF93 target datasheet entry; Section1

  • Plate Voltage

    330 V

    Published in approved EF93 target datasheet entry; Section1

  • Grid-No.3 (Suppressor-Grid) Voltage, Positive value

    0 V

    Published in approved EF93 target datasheet entry; Section1

  • Grid-No.2 Supply Voltage

    330 V

    Published in approved EF93 target datasheet entry; Section1

  • Plate Dissipation

    3.4 W

    Published in approved EF93 target datasheet entry; Section1

  • For grid-No.2 voltages up to

    165 V

    Published in approved EF93 target datasheet entry; Section1

  • For grid-No.2 voltages up to 165 volts

    0.7 W

    Published in approved EF93 target datasheet entry; Section1

  • For grid-No.2 voltages between 165 and

    330 V

    Published in approved EF93 target datasheet entry; Section1

  • Negative-bias value

    55 V

    Published in approved EF93 target datasheet entry; Section1

  • Positive-bias value

    0 V

    Published in approved EF93 target datasheet entry; Section1

  • Plate Supply Voltage 100

    250 V

    Published in approved EF93 target datasheet entry; Section1

Characteristic

  • Tube Voltage Drop for plate current of

    20 mA

    Published in approved EF93 target datasheet entry; Section1

  • Tube Voltage Drop for plate current of 20 mA

    5 V

    Published in approved EF93 target datasheet entry; Section1

  • Grid-No.2 Supply Voltage 100

    100 V

    Published in approved EF93 target datasheet entry; Section1

  • Cathode-Bias Resistor 68

    68 Ω

    Published in approved EF93 target datasheet entry; Section1

  • Plate Resistance (Approx.) 0.25

    1 MΩ

    Published in approved EF93 target datasheet entry; Section1

  • Transconductance 4300

    4400 µS

    Published in approved EF93 target datasheet entry; Section1

Capacitance

  • Heater Voltage (ac/dc) 6.3

    12.6 V

    Published in approved EF93 target datasheet entry; Section1

  • Heater Current 0.3

    150 mA

    Published in approved EF93 target datasheet entry; Section1

  • " This value is

    5.5 pF

    Published in approved EF93 target datasheet entry; Section1