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Voltage - Triode (single) ·Triode

3DX4

Triode for general electronic service. Available source material confirms triode construction but does not establish a narrower functional application confidently.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
B7G
Base pins
7
Nominal heater
3 V / 450 mA

Description

Printed heater variant in the 2DX4/3DX4/6DX4 UHF local-oscillator triode family.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B7G
Base pins
7
Nominal heater voltage
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

1 physical section, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
2700 Ω
Transconductance
0.011 S
Amplification factor
30
Max plate voltage
150 V
Max plate dissipation
2.2 W
Max cathode current
20 mA

Published ratings and characteristics promoted where clearly applicable; additional source values retained as section parameters.

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

1947 Westinghouse

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

  • Heater or filament voltage

    3 V

    Published nominal/representative value

  • Heater or filament current

    450 mA

    Published nominal/representative value

  • Transconductance

    11000 µS

    Published

  • Amplification factor

    30

    Published/promoted value

Other

  • Maximum plate dissipation

    2.2 W

    Published

  • Typical oscillator frequency

    1000 MHz

    Published UHF oscillator condition

  • Plate supply voltage

    100 V

    At 1000 MHz

  • Plate current

    14 mA

    At 1000 MHz

  • Grid current

    250 µA

    At 1000 MHz