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Voltage Dual Pentode ·Pentode-Pentode

8BQ11

Semiremote-cutoff dual pentode intended for television intermediate-frequency amplification, integrating two controlled-gain pentode stages in one Compactron envelope.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
12DM
Socket code
B12C
Base pins
12
Nominal heater
8.4 V / 600 mA

Description

Semiremote-cutoff dual pentode used as an intermediate-frequency amplifier in television receivers.

Socket description

Duodecar 12-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

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

12DM - 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

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
200000 Ω
Transconductance
0.0105 S
Max plate voltage
330 V
Max screen voltage
330 V
Max plate dissipation
3.1 W

Remote-cutoff Section 1. Uploaded sheet is reference/equivalence-only: it states identity to 11BQ11 except heater characteristics and does not reproduce the referenced electrical tables; promoted values intentionally not inferred.

Section 2

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
200000 Ω
Transconductance
0.013 S
Max plate voltage
330 V
Max screen voltage
330 V
Max plate dissipation
3.1 W

Sharp-cutoff Section 2. Uploaded sheet is reference/equivalence-only: it states identity to 11BQ11 except heater characteristics and does not reproduce the referenced electrical tables; promoted values intentionally not inferred.

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

Pentode

Other

  • Heater Voltage AC or DC + v + o o o o + +

    8.4 V

    GENERAL

  • Heater voltage for a bogey tube at If

    600 mA

    GENERAL

  • The time required for the voltage across the heater to reach

    80 %

    GENERAL

Data set 02

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Heater Voltage (ac/dc) 8.4 11.2

    16 V

    Published in approved 8BQ11 target datasheet entry; Section1

  • Heater Current 0.6 0.45

    315 mA

    Published in approved 8BQ11 target datasheet entry; Section1

  • Heater Warm-up Time (Average) 11 11

    11 seconds

    Published in approved 8BQ11 target datasheet entry; Section1

  • Plate of Unit No.l to Plate of Unit No.2

    0.015 pF

    Published in approved 8BQ11 target datasheet entry; Section1

  • Grid No.l of Unit No.l to Plate of Unit No.2

    0.002 pF

    Published in approved 8BQ11 target datasheet entry; Section1

  • Grid No.l of Unit No.2 to Plate of Unit No.l

    0.008 pF

    Published in approved 8BQ11 target datasheet entry; Section1

  • Grid No.l of Unit No.l to Grid No.l of Unit No.2

    0.002 pF

    Published in approved 8BQ11 target datasheet entry; Section1

  • Grid-No.3 (Suppressor-Grid) Voltage 330

    330 V

    Published in approved 8BQ11 target datasheet entry; Section1

  • Grid-No.2 (Screen-Grid) Supply Voltage 0

    0 V

    Published in approved 8BQ11 target datasheet entry; Section1

  • Grid-No.2 Voltage 330

    330 V

    Published in approved 8BQ11 target datasheet entry; Section1

  • Plate Dissipation 0

    0 V

    Published in approved 8BQ11 target datasheet entry; Section1

  • Grid-No.2 Input: 3.1

    3.1 W

    Published in approved 8BQ11 target datasheet entry; Section1

  • For grid-No. 2 voltages up to

    165 V

    Published in approved 8BQ11 target datasheet entry; Section1

  • For grid-No. 2 voltages up to 165 volts 0.65

    0.65 W

    Published in approved 8BQ11 target datasheet entry; Section1

  • For grid-No.2 voltages between 165 and

    330 V

    Published in approved 8BQ11 target datasheet entry; Section1

  • Plate Supply Voltage 125

    125 V

    Published in approved 8BQ11 target datasheet entry; Section1

  • operation 1

    0.25 MΩ

    Published in approved 8BQ11 target datasheet entry; Section1

Capacitance

  • Grid No.3 of Unit No.l, and Internal Shield . 2

    8 pF

    Published in approved 8BQ11 target datasheet entry; Section1

Characteristic

  • Grid-No.2 Voltage 125

    125 V

    Published in approved 8BQ11 target datasheet entry; Section1

  • Cathode-Bias Resistor 66

    66 Ω

    Published in approved 8BQ11 target datasheet entry; Section1

  • Plate Resistance (Approx.) 0.2

    0.2 MΩ

    Published in approved 8BQ11 target datasheet entry; Section1

  • Transconductance 10500

    13000 µS

    Published in approved 8BQ11 target datasheet entry; Section1

  • Plate Current 11

    11 mA

    Published in approved 8BQ11 target datasheet entry; Section1

  • Grid-No.2 Current 3.6

    3.8 mA

    Published in approved 8BQ11 target datasheet entry; Section1

  • —

    -3 V

    Published in approved 8BQ11 target datasheet entry; Section1

SECTION 2

Pentode

Other

  • Heater Voltage (ac/dc) 8.4 11.2

    16 V

    Published in approved 8BQ11 target datasheet entry; Section2

  • Heater Current 0.6 0.45

    315 mA

    Published in approved 8BQ11 target datasheet entry; Section2

  • Heater Warm-up Time (Average) 11 11

    11 seconds

    Published in approved 8BQ11 target datasheet entry; Section2

  • Plate of Unit No.l to Plate of Unit No.2

    0.015 pF

    Published in approved 8BQ11 target datasheet entry; Section2

  • Grid No.l of Unit No.l to Plate of Unit No.2

    0.002 pF

    Published in approved 8BQ11 target datasheet entry; Section2

  • Grid No.l of Unit No.2 to Plate of Unit No.l

    0.008 pF

    Published in approved 8BQ11 target datasheet entry; Section2

  • Grid No.l of Unit No.l to Grid No.l of Unit No.2

    0.002 pF

    Published in approved 8BQ11 target datasheet entry; Section2

  • Grid-No.3 (Suppressor-Grid) Voltage 330

    330 V

    Published in approved 8BQ11 target datasheet entry; Section2

  • Grid-No.2 (Screen-Grid) Supply Voltage 0

    0 V

    Published in approved 8BQ11 target datasheet entry; Section2

  • Grid-No.2 Voltage 330

    330 V

    Published in approved 8BQ11 target datasheet entry; Section2

  • Plate Dissipation 0

    0 V

    Published in approved 8BQ11 target datasheet entry; Section2

  • Grid-No.2 Input: 3.1

    3.1 W

    Published in approved 8BQ11 target datasheet entry; Section2

  • For grid-No. 2 voltages up to

    165 V

    Published in approved 8BQ11 target datasheet entry; Section2

  • For grid-No. 2 voltages up to 165 volts 0.65

    0.65 W

    Published in approved 8BQ11 target datasheet entry; Section2

  • For grid-No.2 voltages between 165 and

    330 V

    Published in approved 8BQ11 target datasheet entry; Section2

  • Plate Supply Voltage 125

    125 V

    Published in approved 8BQ11 target datasheet entry; Section2

  • operation 1

    0.25 MΩ

    Published in approved 8BQ11 target datasheet entry; Section2

Capacitance

  • Grid No.3 of Unit No.l, and Internal Shield . 2

    8 pF

    Published in approved 8BQ11 target datasheet entry; Section2

Characteristic

  • Grid-No.2 Voltage 125

    125 V

    Published in approved 8BQ11 target datasheet entry; Section2

  • Cathode-Bias Resistor 66

    66 Ω

    Published in approved 8BQ11 target datasheet entry; Section2

  • Plate Resistance (Approx.) 0.2

    0.2 MΩ

    Published in approved 8BQ11 target datasheet entry; Section2

  • Transconductance 10500

    13000 µS

    Published in approved 8BQ11 target datasheet entry; Section2

  • Plate Current 11

    11 mA

    Published in approved 8BQ11 target datasheet entry; Section2

  • Grid-No.2 Current 3.6

    3.8 mA

    Published in approved 8BQ11 target datasheet entry; Section2

  • —

    -3 V

    Published in approved 8BQ11 target datasheet entry; Section2