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Voltage - Triode (single high frequency) ·Triode

ND4

High-frequency triode for UHF/VHF amplification, oscillator, mixer, or microwave signal service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
12.6 V / 180 mA

Description

Telefunken ND4 indirectly heated transmitting triode intended for oscillation generation down to approximately 50 cm wavelength.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
-
Base pins
-
Nominal heater voltage
12.6 V
Nominal heater current
180 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
3500 Ω
Transconductance
0.01 S
Amplification factor
35
Max plate voltage
350 V
Max plate dissipation
12 W
Max cathode current
90 mA

Published ratings and characteristics were promoted when unambiguous; additional operating values are preserved 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

194X Wehrmacht Rohren

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

  • Input capacitance

    3.1 pF

  • Grid-plate capacitance

    2.9 pF

  • Output capacitance

    0.7 pF

Other

  • RF output power

    9 W

    Self-excited; approx. 1 m wavelength; Ua=300 V