TH491H

Hypervapotron vapor/high-temperature-water-cooled transmitting tetrode designed for UHF television service. Its advanced cooling system supports very high broadcast power.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 5.2 V / 180 A

Description

Hypervapotron vapor/high-temperature-water-cooled transmitting tetrode for UHF television 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: 5.2 V
Nominal heater current: 180 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

Tetrode

X-ray radiationInterelectrode capacitances

Transconductance: 0.1 S
Amplification factor: 4.5
Max plate voltage: 6000 V
Max screen voltage: 600 V
Max plate dissipation: 30000 W
Max screen dissipation: 200 W
Max grid dissipation: 100 W
Max cathode current: 40 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

Tetrode

Other

Input Capacitance
110 pF
Output Capacitance
23 pF
Cathode-Anode Capacitance Maximum
0.1 pF
DC Anode Current Maximum
10 A
Frequency Maximum
870 MHz
Typical Frequency
700 MHz
Typical Average Anode Current
7.3 A
Typical Grid 2 Current
80 mA