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Voltage - Triode (single high frequency) ·Triode

1D3

Directly heated low-mu high-frequency triode for Class A amplifier service, providing small-signal gain at comparatively high frequencies.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
8DN
Socket code
-
Base pins
8
Nominal heater
1.25 V / 300 mA

Description

Directly heated low-mu high-frequency triode for Class-A amplifier service.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
8DN
Socket code
-
Base pins
8
Nominal heater voltage
1.25 V
Nominal heater current
300 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

8DN - Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances
Transconductance
0.0034 S
Amplification factor
8.7
Max plate voltage
110 V

Promoted from the printed condensed-manual maximum/characteristic columns; operating-point values are retained in TUBE_SECTION_PARAMETER.

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

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Maximum Plate Current

    22 mA

  • Plate Voltage

    90 V

Characteristic

  • Plate Current

    12.5 mA

    Plate 90 V; grid -5 V

Capacitance

  • Grid-to-Plate Capacitance

    2.6 pF

Data set 02

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

  • Input capacitance

    1 pF

    Section1

  • Output capacitance

    1 pF

    Section1

  • Grid-to-plate capacitance

    2.6 pF

    Section1

Other

  • Plate voltage

    90 V

    ClassA

  • Control-grid voltage

    -5 V

    ClassA

  • Plate current

    12.5 mA

    ClassA

Characteristic

  • Transconductance

    3400 µS

    ClassA

  • Amplification factor

    8.7

    ClassA