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Voltage Dual Triode Pentode ·Pentode-Triode-Triode

14BL11

Duodecar television tube with two general-purpose triodes and a sharp-cutoff pentode used specifically for video-amplifier service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 3
Base: 12GC
Socket code: B12C
Base pins: 12
Nominal heater: 14.2 V / 450 mA

Description

Duodecar type used in television receiver applications. k T2 The pentode unit is used for video amplifier service, and the triode units for general-purpose use. Outlines g tz section, 8B; requires duodecar 12-contact socket.

Socket description

Duodecar 12-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 12GC
Socket code: B12C
Base pins: 12
Nominal heater voltage: 14.2 V
Nominal heater current: 450 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

12GC - 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

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 70000 Ω
Transconductance: 0.019 S
Amplification factor: 40
Max plate voltage: 250 V
Max screen voltage: 125 V
Max plate dissipation: 2.5 W
Max screen dissipation: 1.25 W

Sharp-cutoff frame-grid pentode.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 12500 Ω
Transconductance: 0.0055 S
Amplification factor: 69
Max plate voltage: 330 V
Max plate dissipation: 1.5 W

High-mu triode, Section 1.

Section 3

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 7600 Ω
Transconductance: 0.0053 S
Amplification factor: 40
Max plate voltage: 330 V
Max plate dissipation: 2 W

Medium-mu triode, Section 2.

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

Plate Voltage
200 V
AverageCharacteristics
Screen Voltage
100 V
AverageCharacteristics

Characteristic

Plate Current
16 mA
AverageCharacteristics
Screen Current
3 mA
AverageCharacteristics

SECTION 2

Triode

Other

Plate Voltage
200 V
AverageCharacteristics

Characteristic

Plate Current
7.1 mA
AverageCharacteristics

SECTION 3

Triode

Other

Plate Voltage
200 V
AverageCharacteristics

Characteristic

Plate Current
7.2 mA
AverageCharacteristics

Data set 02

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 2

Triode

Other

warm-up time
11 seconds
Published value from supplied target entry
amperes,
11 amperes
Published value from supplied target entry

Characteristic

Plate Voltage
250 volts
Published value from supplied target entry
Grid-No
125 volts
Published value from supplied target entry
Plate Dissipation
2.5 watts
Published value from supplied target entry
Grid-No
1.25 watts
Published value from supplied target entry
Plate Voltage
200 volts
Published value from supplied target entry
Grid-No
100 volts
Published value from supplied target entry
Grid-No.l Voltage
0 volts
Published value from supplied target entry
Amplification Factor
69
Published value from supplied target entry
Plate Resistance (Approx.)
70000 ohms
Published value from supplied target entry
Transconductance
19000
Published value from supplied target entry
Plate Current
16 mA
Published value from supplied target entry
Grid-No
3 mA
Published value from supplied target entry