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Power - Triode ·Triode

DET29

Conduction-cooled microwave triode for coaxial oscillator and amplifier circuits. Its compact low-inductance construction supports fundamental operation to approximately 5 GHz and frequency multiplication to roughly 7 GHz.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
6.3 V / 500 mA

Description

The Marconi DET29 is a conduction-cooled microwave triode for coaxial oscillator/amplifier service to 5 ghz and multiplication to 7 ghz.

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
6.3 V
Nominal heater current
500 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
Transconductance
0.024 S
Amplification factor
55
Max plate voltage
1000 V
Max plate dissipation
10 W
Max grid dissipation
0.25 W
Max cathode current
500 mA

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

    6.3 V

  • Heater/filament current

    500 mA

  • Maximum plate voltage

    1000 V

  • Maximum plate dissipation

    10 W

  • Maximum grid dissipation

    0.25 W

  • Maximum cathode/plate current

    500 mA

  • Maximum/service frequency

    7000 MHz

  • Mean plate current

    40 mA

  • Peak plate voltage

    1000 V

  • Oscillator/amplifier frequency limit

    5000 MHz

  • Frequency multiplier limit

    7000 MHz

Characteristic

  • Amplification factor

    55

  • Transconductance

    24000 uS

Capacitance

  • Grid-plate capacitance

    1.2 pF

  • Plate-cathode capacitance

    0.025 pF

  • Grid-cathode capacitance

    3.4 pF