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DET18

Directly heated triode for transmitting and RF power service; available source material does not establish a narrower application confidently.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 5 V / 4 A

Description

Thoriated-tungsten transmitting triode for oscillator and HF-amplifier service to about 120 MHz.

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: 5 V
Nominal heater current: 4 A
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

Transconductance: 0.044 S
Amplification factor: 32.5
Max plate voltage: 2000 V
Max plate dissipation: 50 W
Max cathode current: 2 A

Applicable promoted ratings mapped semantically from the printed approximate-data/ratings tables; useful non-promoted operating, capacitance and service data 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

1955 Marconi

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Grid Current Maximum
35 mA
Peak Cathode Current Maximum
2 A
Frequency Maximum
120 MHz
Anode-Grid Capacitance
1.7 pF
Anode-Cathode Capacitance
0.17 pF
Grid-Cathode Capacitance
4.6 pF

Characteristic

Transconductance at 700V/500mA
0.044 A/V