DET27

Thoriated-tungsten power triode for HF amplification, oscillation, and audio power-amplifier service. Rated for approximately 250 W plate dissipation and 2.7 kV plate voltage for medium-power transmitter and modulator stages.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 10 V / 10 A

Description

The Marconi DET27 is a thoriated-tungsten power triode for hf amplifier, oscillator, and audio power-amplifier service.

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: 10 V
Nominal heater current: 10 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: 22
Max plate voltage: 2700 V
Max plate dissipation: 250 W
Max grid dissipation: 20 W
Max cathode current: 4 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
10 V
Heater/filament current
10 A
Maximum plate voltage
2700 V
Maximum plate dissipation
250 W
Maximum grid dissipation
20 W
Maximum cathode/plate current
4 A
Maximum/service frequency
3 MHz
Peak plate voltage
6000 V
Maximum grid current
2 A

Characteristic

Amplification factor
22
Transconductance
9000 uS

Capacitance

Grid-plate capacitance
24 pF
Plate-cathode capacitance
75 pF
Grid-cathode capacitance
14 pF