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TD0420

Mullard disc-seal power triode for RF amplifier and oscillator service to approximately 1 GHz. Rated around 20 W dissipation, its high transconductance and low-inductance construction provide useful UHF power.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 1 A

Description

The Mullard TD0420 is a disc-seal triode for RF amplifier or oscillator service to about 1 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: 1 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

Plate resistance: 2800 Ω
Transconductance: 0.01 S
Amplification factor: 28
Max plate voltage: 400 V
Max plate dissipation: 20 W

Disc-seal triode for RF amplifier or oscillator service to about 1 GHz.

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

1963 Mullard

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Heater/Filament Voltage
6.3 V
Heater/Filament Current
1 A
Transconductance
10000 uS
Amplification Factor
28 ratio
Plate Resistance
2800 ohm
Plate Voltage
400 V
Plate Current
50 mA
Plate-Grid Capacitance
2.3 pF
Plate-Cathode Capacitance
0.05 pF
Grid-Cathode Capacitance
5 pF

Other

Maximum Plate Voltage
400 V
Maximum Plate Dissipation
20 W
Maximum Operating Frequency
1000 MHz
RF Output Power
13.5 W
Representative