DET3

Large thoriated-tungsten transmitting triode for medium-frequency power amplification. Rated for approximately 250 W plate dissipation and 3 kV plate voltage, suited to substantial transmitter stages at frequencies to roughly 3 MHz.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 15 V / 40 A

Description

The Marconi DET3 is a thoriated-tungsten transmitting triode for medium-frequency power-amplifier service to 3 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: 15 V
Nominal heater current: 40 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: 0.009 S
Amplification factor: 19
Max plate voltage: 3000 V
Max plate dissipation: 250 W
Max cathode current: 25 A

Highest reliable published rating promoted; remaining microwave/RF operating data retained as 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

1955 Marconi

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Heater/filament voltage
15 V
Heater/filament current
40 A
Maximum plate voltage
3000 V
Maximum plate dissipation
250 W
Maximum cathode/plate current
25 A
Maximum/service frequency
3 MHz
Maximum grid current
50 mA

Characteristic

Amplification factor
19
Transconductance
9000 uS

Capacitance

Grid-plate capacitance
17 pF
Plate-cathode capacitance
2 pF
Grid-cathode capacitance
18 pF