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

Voltage - Triode (with diode, heptode or hexode) ·Diode-Diode-Diode-Triode

6LD12

Triple-diode high-mu triode combining several detector or discriminator functions with voltage amplification. Three diode sections provide multiple rectification paths while the triode supplies substantial subsequent gain.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
4
Base
-
Socket code
B9A
Base pins
9
Nominal heater
6.3 V / 450 mA

Description

Triple-diode triode for AM/FM detection and audio-frequency voltage amplification.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B9A
Base pins
9
Nominal heater voltage
6.3 V
Nominal heater current
450 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

4 physical sections, each with unique specifications.

Section 1

Diode

X-ray radiationInterelectrode capacitances
Max cathode current
1 mA
Rectifier peak inverse voltage
350 V
Rectifier nominal output current
1 mA

Published electrical limits and characteristics promoted from the approved source.

Section 2

Diode

X-ray radiationInterelectrode capacitances
Max cathode current
10 mA
Rectifier peak inverse voltage
350 V
Rectifier nominal output current
10 mA

Published electrical limits and characteristics promoted from the approved source.

Section 3

Diode

X-ray radiationInterelectrode capacitances
Max cathode current
10 mA
Rectifier peak inverse voltage
350 V
Rectifier nominal output current
10 mA

Published electrical limits and characteristics promoted from the approved source.

Section 4

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
48000 Ω
Transconductance
0.00145 S
Amplification factor
70
Max plate voltage
300 V
Max plate dissipation
1 W
Max cathode current
5 mA

Published electrical limits and characteristics promoted from the approved source.

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

1973 Mazda Valves Binder 2

Published operating points and test conditions from this source.

SECTION 1

Diode

Other

  • HeaterVoltageNominal

    6.3 V

    Nominal

  • HeaterCurrentNominal

    450 mA

    Nominal

  • Maximum Cathode Current

    1 mA

  • Maximum Peak Inverse Voltage

    350 V

  • Rectified Output Current

    1 mA

SECTION 2

Diode

Other

  • HeaterVoltageNominal

    6.3 V

    Nominal

  • HeaterCurrentNominal

    450 mA

    Nominal

  • Maximum Cathode Current

    10 mA

  • Maximum Peak Inverse Voltage

    350 V

  • Rectified Output Current

    10 mA

SECTION 3

Diode

Other

  • HeaterVoltageNominal

    6.3 V

    Nominal

  • HeaterCurrentNominal

    450 mA

    Nominal

  • Maximum Cathode Current

    10 mA

  • Maximum Peak Inverse Voltage

    350 V

  • Rectified Output Current

    10 mA

SECTION 4

Triode

Other

  • HeaterVoltageNominal

    6.3 V

    Nominal

  • HeaterCurrentNominal

    450 mA

    Nominal

  • Maximum Plate Voltage

    300 V

  • Maximum Plate Dissipation

    1 W

  • Maximum Cathode Current

    5 mA

Characteristic

  • Transconductance

    1450 µS

    Typical

  • Amplification Factor

    70

    Typical

  • Plate Resistance

    48000 ohm

    Typical