TH308

Forced-air-cooled Thomson-CSF high-gain planar ceramic-metal triode for linear television-translator amplification. Rated around 700 W dissipation and 2.2 kV, it provides substantially greater linear broadcast power.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 5.5 A

Description

The Thomson-CSF TH308 is a forced-air-cooled high-gain planar ceramic/metal triode for linear television-translator 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: 6.3 V
Nominal heater current: 5.5 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: 0.045 S
Amplification factor: 80
Max plate voltage: 2200 V
Max plate dissipation: 700 W

Promoted from printed general-characteristics and maximum-ratings tables.

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

Characteristic

Amplification factor
80
Transconductance
45000 uS

Other

Maximum anode voltage
2200 V
Maximum anode dissipation
700 W
Maximum operating frequency
1000 MHz
Typical frequency
780 MHz
Typical anode voltage
1800 V
Typical anode current
200 mA
Gain
16 dB
Peak video power
100 W

Capacitance

Grid-anode/input capacitance
8.2 pF
Grid-cathode/output capacitance
16 pF
Cathode-anode capacitance
0.13 pF