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

Voltage Dual Pentode Triode ·Pentode-Pentode-Triode

8BA11

Compactron heater variant of 6BA11, combining a medium-mu triode with twin pentodes for television vertical-deflection oscillator and sync/AGC circuitry.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
3
Base
12ER
Socket code
B12C
Base pins
12
Nominal heater
8.4 V / 450 mA

Description

Triode plus twin-pentode tube used as a vertical-deflection oscillator and in combined sync/AGC television circuits.

Socket description

Duodecar 12-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
12ER
Socket code
B12C
Base pins
12
Nominal heater voltage
8.4 V
Nominal heater current
450 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

12ER - Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

3 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances
Transconductance
0.0018 S
Amplification factor
18
Max plate voltage
300 V
Max plate dissipation
1.5 W
Max cathode current
20 mA

Medium-mu triode section; source cross-references 6BA11 for ratings.

Section 2

Pentode

X-ray radiationInterelectrode capacitances
Transconductance
0.0017 S
Max plate voltage
300 V
Max screen voltage
150 V
Max plate dissipation
1.1 W
Max cathode current
12 mA

Representative row for two equivalent pentode plate sections sharing screen/grid-1/cathode; source cross-references 6BA11.

Section 3

Pentode

X-ray radiationInterelectrode capacitances
Transconductance
0.0017 S
Max plate voltage
300 V
Max screen voltage
150 V
Max plate dissipation
1.1 W
Max cathode current
12 mA

Second physical pentode plate section sharing common electrodes; 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

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • HeaterOrFilamentVoltageNominal

    8.4 V

  • HeaterOrFilamentCurrentNominal

    450 mA

  • PublishedCrossReference

    6BA11

    Source states electrical identity except noted heater/mechanical differences

Data set 02

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Heater Voltage (ac/dc) 6.3

    8.4 V

    Published in approved 8BA11 target datasheet entry; Section1

  • Heater Current 0.6

    450 mA

    Published in approved 8BA11 target datasheet entry; Section1

  • Heater Warm-up Time 11

    11 seconds

    Published in approved 8BA11 target datasheet entry; Section1

  • Plate Voltage

    300 V

    Published in approved 8BA11 target datasheet entry; Section1

  • Average Cathode Current

    20 mA

    Published in approved 8BA11 target datasheet entry; Section1

  • Plate Dissipation

    1.5 W

    Published in approved 8BA11 target datasheet entry; Section1

  • Plate Voltage

    250 V

    Published in approved 8BA11 target datasheet entry; Section1

  • Grid Voltage

    -11 V

    Published in approved 8BA11 target datasheet entry; Section1

  • Transconductance

    1800 µS

    Published in approved 8BA11 target datasheet entry; Section1

  • Plate Current

    5 mA

    Published in approved 8BA11 target datasheet entry; Section1

  • Grid Voltage (Approx.) for plate current of 100 juA

    -18 V

    Published in approved 8BA11 target datasheet entry; Section1

  • For fixed-bias operation

    0.25 MΩ

    Published in approved 8BA11 target datasheet entry; Section1

  • For cathode-bias operation

    1 MΩ

    Published in approved 8BA11 target datasheet entry; Section1

  • Plate Voltage (Each Unit)

    300 V

    Published in approved 8BA11 target datasheet entry; Section1

  • Peak positive value

    50 V

    Published in approved 8BA11 target datasheet entry; Section1

  • DC negative value

    50 V

    Published in approved 8BA11 target datasheet entry; Section1

  • DC positive value

    3 V

    Published in approved 8BA11 target datasheet entry; Section1

  • Grid-No.2 (Screen-Grid) Voltage

    150 V

    Published in approved 8BA11 target datasheet entry; Section1

  • Grid-No.l (Control-Grid) Voltage, Negative bias value

    50 V

    Published in approved 8BA11 target datasheet entry; Section1

  • Cathode Current

    12 mA

    Published in approved 8BA11 target datasheet entry; Section1

  • Plate Dissipation (Each Unit)

    1.1 W

    Published in approved 8BA11 target datasheet entry; Section1

  • Grid-No.2 Input

    0.75 W

    Published in approved 8BA11 target datasheet entry; Section1

  • Grid-No.3-Circuit Resistance (Each Unit)

    0.5 MΩ

    Published in approved 8BA11 target datasheet entry; Section1

  • Grid-No.l-Circuit Resistance

    0.5 MΩ

    Published in approved 8BA11 target datasheet entry; Section1

Capacitance

  • Grid to Plate

    2 pF

    Published in approved 8BA11 target datasheet entry; Section1

  • Grid to Cathode and Heater

    2 pF

    Published in approved 8BA11 target datasheet entry; Section1

  • Plate to Cathode, Heater, and Internal Shield

    1.9 pF

    Published in approved 8BA11 target datasheet entry; Section1

  • Grid No.3 to Plate (Each Unit)

    2 pF

    Published in approved 8BA11 target datasheet entry; Section1

  • Grid No.3 to all Other Electrodes (Each Grid)

    3.6 pF

    Published in approved 8BA11 target datasheet entry; Section1

  • Grid No.l to all Other Electrodes)

    6 pF

    Published in approved 8BA11 target datasheet entry; Section1

  • Plate to all Other Electrodes (Each Plate)

    3 pF

    Published in approved 8BA11 target datasheet entry; Section1

Characteristic

  • Plate Voltage (Each Unit) 100

    100 V

    Published in approved 8BA11 target datasheet entry; Section1

  • Grid-No.3 Voltage (Each Unit) —10

    0 V

    Published in approved 8BA11 target datasheet entry; Section1

  • Grid-No.2 Voltage 67.5

    67.5 V

    Published in approved 8BA11 target datasheet entry; Section1

  • Plate Current (Each Unit) 0

    2.5 mA

    Published in approved 8BA11 target datasheet entry; Section1

  • Grid-No.2 Current 7

    4.4 mA

    Published in approved 8BA11 target datasheet entry; Section1

  • Plate Voltage 100

    100 V

    Published in approved 8BA11 target datasheet entry; Section1

  • Grid-No.3 Voltage 0

    0 V

    Published in approved 8BA11 target datasheet entry; Section1

  • Grid-No.l Transconductance

    1700 µS

    Published in approved 8BA11 target datasheet entry; Section1

  • Plate Current

    2.5 mA

    Published in approved 8BA11 target datasheet entry; Section1

  • 100 /iA

    3.2 V

    Published in approved 8BA11 target datasheet entry; Section1

SECTION 2

Pentode

Other

  • Heater Voltage (ac/dc) 6.3

    8.4 V

    Published in approved 8BA11 target datasheet entry; Section2

  • Heater Current 0.6

    450 mA

    Published in approved 8BA11 target datasheet entry; Section2

  • Heater Warm-up Time 11

    11 seconds

    Published in approved 8BA11 target datasheet entry; Section2

  • Plate Voltage

    300 V

    Published in approved 8BA11 target datasheet entry; Section2

  • Average Cathode Current

    20 mA

    Published in approved 8BA11 target datasheet entry; Section2

  • Plate Dissipation

    1.5 W

    Published in approved 8BA11 target datasheet entry; Section2

  • Plate Voltage

    250 V

    Published in approved 8BA11 target datasheet entry; Section2

  • Grid Voltage

    -11 V

    Published in approved 8BA11 target datasheet entry; Section2

  • Transconductance

    1800 µS

    Published in approved 8BA11 target datasheet entry; Section2

  • Plate Current

    5 mA

    Published in approved 8BA11 target datasheet entry; Section2

  • Grid Voltage (Approx.) for plate current of 100 juA

    -18 V

    Published in approved 8BA11 target datasheet entry; Section2

  • For fixed-bias operation

    0.25 MΩ

    Published in approved 8BA11 target datasheet entry; Section2

  • For cathode-bias operation

    1 MΩ

    Published in approved 8BA11 target datasheet entry; Section2

  • Plate Voltage (Each Unit)

    300 V

    Published in approved 8BA11 target datasheet entry; Section2

  • Peak positive value

    50 V

    Published in approved 8BA11 target datasheet entry; Section2

  • DC negative value

    50 V

    Published in approved 8BA11 target datasheet entry; Section2

  • DC positive value

    3 V

    Published in approved 8BA11 target datasheet entry; Section2

  • Grid-No.2 (Screen-Grid) Voltage

    150 V

    Published in approved 8BA11 target datasheet entry; Section2

  • Grid-No.l (Control-Grid) Voltage, Negative bias value

    50 V

    Published in approved 8BA11 target datasheet entry; Section2

  • Cathode Current

    12 mA

    Published in approved 8BA11 target datasheet entry; Section2

  • Plate Dissipation (Each Unit)

    1.1 W

    Published in approved 8BA11 target datasheet entry; Section2

  • Grid-No.2 Input

    0.75 W

    Published in approved 8BA11 target datasheet entry; Section2

  • Grid-No.3-Circuit Resistance (Each Unit)

    0.5 MΩ

    Published in approved 8BA11 target datasheet entry; Section2

  • Grid-No.l-Circuit Resistance

    0.5 MΩ

    Published in approved 8BA11 target datasheet entry; Section2

Capacitance

  • Grid to Plate

    2 pF

    Published in approved 8BA11 target datasheet entry; Section2

  • Grid to Cathode and Heater

    2 pF

    Published in approved 8BA11 target datasheet entry; Section2

  • Plate to Cathode, Heater, and Internal Shield

    1.9 pF

    Published in approved 8BA11 target datasheet entry; Section2

  • Grid No.3 to Plate (Each Unit)

    2 pF

    Published in approved 8BA11 target datasheet entry; Section2

  • Grid No.3 to all Other Electrodes (Each Grid)

    3.6 pF

    Published in approved 8BA11 target datasheet entry; Section2

  • Grid No.l to all Other Electrodes)

    6 pF

    Published in approved 8BA11 target datasheet entry; Section2

  • Plate to all Other Electrodes (Each Plate)

    3 pF

    Published in approved 8BA11 target datasheet entry; Section2

Characteristic

  • Plate Voltage (Each Unit) 100

    100 V

    Published in approved 8BA11 target datasheet entry; Section2

  • Grid-No.3 Voltage (Each Unit) —10

    0 V

    Published in approved 8BA11 target datasheet entry; Section2

  • Grid-No.2 Voltage 67.5

    67.5 V

    Published in approved 8BA11 target datasheet entry; Section2

  • Plate Current (Each Unit) 0

    2.5 mA

    Published in approved 8BA11 target datasheet entry; Section2

  • Grid-No.2 Current 7

    4.4 mA

    Published in approved 8BA11 target datasheet entry; Section2

  • Plate Voltage 100

    100 V

    Published in approved 8BA11 target datasheet entry; Section2

  • Grid-No.3 Voltage 0

    0 V

    Published in approved 8BA11 target datasheet entry; Section2

  • Grid-No.l Transconductance

    1700 µS

    Published in approved 8BA11 target datasheet entry; Section2

  • Plate Current

    2.5 mA

    Published in approved 8BA11 target datasheet entry; Section2

  • 100 /iA

    3.2 V

    Published in approved 8BA11 target datasheet entry; Section2