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Voltage Dual Triode Pentode ·Pentode-Triode-Triode

6AS11

Three-section Duodecar combining high-mu and medium-mu triodes with a sharp-cutoff pentode, each documented for Class-A amplifier operation.

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

Description

6AS11 is a three-section Duodecar tube combining high-mu and medium-mu triodes with a sharp-cutoff pentode, each with separately published Class A1 characteristics.

Socket description

Duodecar 12-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
12DP
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

12DP - 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
1.5 W

High-mu triode Unit No.1.

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 Unit No.2.

Section 3

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
70000 Ω
Transconductance
0.0105 S
Max plate voltage
330 V
Max screen voltage
330 V
Max plate dissipation
5 W
Max screen dissipation
1.1 W

Sharp-cutoff pentode unit.

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

1971 RCA HB3 Binder 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Heater voltage nominal

    6.3 V

  • Heater current

    1.05 A

  • Maximum plate voltage

    330 V

    ClassA1

  • Maximum plate dissipation

    1.5 W

    ClassA1

Characteristics

  • Plate supply voltage

    200 V

    ClassA1

  • Amplification factor

    68

    ClassA1

  • Plate resistance

    12400 ohm

    ClassA1

  • Transconductance

    5500 µS

    ClassA1

  • Plate current

    7 mA

    ClassA1

SECTION 2

Triode

Other

  • Heater voltage nominal

    6.3 V

  • Heater current

    1.05 A

  • Maximum plate voltage

    330 V

    ClassA1

  • Maximum plate dissipation

    2 W

    ClassA1

Characteristics

  • Plate supply voltage

    200 V

    ClassA1

  • Amplification factor

    41

    ClassA1

  • Plate resistance

    9400 ohm

    ClassA1

  • Transconductance

    4400 µS

    ClassA1

  • Plate current

    9.2 mA

    ClassA1

SECTION 3

Pentode

Other

  • Heater voltage nominal

    6.3 V

  • Heater current

    1.05 A

  • Maximum plate voltage

    330 V

    ClassA1

  • Maximum screen supply voltage

    330 V

    ClassA1

  • Maximum screen input

    1.1 W

    ClassA1

  • Maximum plate dissipation

    5 W

    ClassA1

Characteristics

  • Plate supply voltage

    200 V

    ClassA1

  • Screen supply voltage

    125 V

    ClassA1

  • Cathode resistor

    68 ohm

    ClassA1

  • Plate resistance

    70000 ohm

    ClassA1

  • Transconductance

    10500 µS

    ClassA1

  • Plate current

    24 mA

    ClassA1

  • Screen current

    5.2 mA

    ClassA1