TH390

Forced-air-cooled ceramic-metal coaxial tetrode designed for linear television RF amplification to approximately 1 GHz. Its UHF construction supports broadband professional television service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 4.5 V / 140 A

Description

Forced-air ceramic-metal coaxial tetrode for linear television RF amplification to 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: 4.5 V
Nominal heater current: 140 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: 0.07 S
Amplification factor: 6
Max plate voltage: 5200 V
Max screen voltage: 650 V
Max plate dissipation: 12000 W
Max screen dissipation: 150 W
Max cathode current: 25 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
75 pF
Output Capacitance
20 pF
Cathode-Anode Capacitance
0.01 pF
DC Anode Current Maximum
6 A
Frequency Maximum
1000 MHz
Typical Frequency
860 MHz
Typical Screen Voltage
600 V
Peak Cathode Current
25 A