TH477

Vapotron vapor-cooled transmitting power triode for continuous-wave oscillator and audio- or RF amplifier service. Approximately 40 kW plate dissipation and 15 kV capability support major professional transmitter installations.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 7.2 V / 200 A

Description

Vapotron vapor-cooled transmitting triode for CW oscillator and AF/RF amplifier service to 30 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: 7.2 V
Nominal heater current: 200 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: 0.03 S
Amplification factor: 23
Max plate voltage: 15000 V
Max plate dissipation: 40000 W
Max grid dissipation: 700 W
Max cathode current: 7 A

Promoted maximum ratings/characteristics mapped semantically from the printed ratings tables; additional published electrical data are preserved 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

1972 Thomson CSF

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Filament Starting Current Maximum
600 A
Filament Resistance Cold
0.006 ohm
Cathode-Grid Capacitance
64 pF
Grid-Anode Capacitance
39 pF
Anode-Cathode Capacitance
1.5 pF
DC Anode Current Maximum
7 A
DC Grid Current Maximum
900 mA
Input Power Maximum
90 kW
Frequency Full Load Maximum
30 MHz