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Voltage Dual Triode Pentode ·Pentode-Triode-Triode

6AF11

Three-section television tube combining AGC-keyer and sync-separator triodes with a sharp-cutoff video-amplifier pentode.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
3
Base
E12-70
Socket code
B12C
Base pins
12
Nominal heater
6.3 V / 1.05 A

Description

Dual-triode plus sharp-cutoff pentode television tube: AGC keyer, sync separator, and video amplifier sections.

Socket description

Duodecar 12-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
E12-70
Socket code
B12C
Base pins
12
Nominal heater voltage
6.3 V
Nominal heater current
1.05 A
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

E12-70 - 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
Plate resistance
12400 Ω
Transconductance
0.0055 S
Amplification factor
68
Max plate voltage
330 V
Max plate dissipation
1.1 W

High-mu triode; AGC keyer service.

Section 2

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
9400 Ω
Transconductance
0.0044 S
Amplification factor
41
Max plate voltage
330 V
Max plate dissipation
2 W

Medium-mu triode; sync-separator service.

Section 3

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
68000 Ω
Transconductance
0.011 S
Max plate voltage
330 V
Max screen voltage
330 V
Max plate dissipation
5 W
Max screen dissipation
1.25 W

Sharp-cutoff pentode; video-amplifier service.

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

    6.3 V

  • HeaterOrFilamentCurrentNominal

    1.05 A

  • Maximum Plate Voltage

    330 V

  • Maximum Plate Dissipation

    1.1 W

Characteristic

  • Plate Resistance

    12400 Ohm

  • Transconductance

    5500 uS

  • Amplification Factor

    68

SECTION 2

Triode

Characteristic

  • Plate Resistance

    9400 Ohm

  • Transconductance

    4400 uS

  • Amplification Factor

    41

Other

  • Maximum Plate Voltage

    330 V

  • Maximum Plate Dissipation

    2 W

SECTION 3

Pentode

Characteristic

  • Plate Resistance

    68000 Ohm

  • Transconductance

    11000 uS

Other

  • Maximum Plate Voltage

    330 V

  • Maximum Plate Dissipation

    5 W

  • Maximum Screen Dissipation

    1.25 W

Data set 02

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Plate Supply Voltage

    200 V

    Section1

  • Amplification Factor

    68

    Section1

  • Plate Resistance

    12400 ohm

    Section1

  • Transconductance

    5500 uS

    Section1

SECTION 2

Triode

Characteristic

  • Plate Supply Voltage

    200 V

    Section2

  • Cathode Bias Resistor

    220 ohm

    Section2

  • Amplification Factor

    41

    Section2

  • Plate Resistance

    9400 ohm

    Section2

  • Transconductance

    4400 uS

    Section2

SECTION 3

Pentode

Characteristic

  • Plate Supply Voltage

    250 V

    Section3

  • Grid No.2 Supply Voltage

    150 V

    Section3

  • Cathode Bias Resistor

    100 ohm

    Section3

  • Plate Resistance

    68000 ohm

    Section3

  • Transconductance

    11000 uS

    Section3