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The YU-108 (3CX4500F3) is a forced air-cooled medium-power metal-ceramic-sealed triode with a thoriated-tungsten cathode. When operated at a frequency of 75MHz, the anode dissipation power is 6kW and 300W for grid. It is mainly used as an oscillator in industrial heating equipment.

In industrial applications, the filament is connected with soft lead, and the grid is connected to equipment via a solid flange.

Specifications:

Filament Voltage……7.0±0.35V

Filament Current (at 7V)……78±3A

Amplification Factor……22

Interelectrode Capacitances (Grounded cathode）

           Input……35±5.2pF, Output……0.9±0.3pF, Grid-Anode……20±3.2Pf

Frequency (continuous wave)……75MHz

Mounting……upright

Cooling……forced air cooling

Anode Shell Temperature……250℃

Temperature at filament and base joints……150℃

Maximum Length……468.3mm

Maximum Diameter……155.58mm

Maximum ratings (Class C telegraphy or frequency modulation)

DC Anode Voltage……9000V

DC Grid Voltage……-1000V

DC Anode Current……3.0A

DC Grid Current……0.8A

Grid Dissipation……300W

Anode Dissipation……6 kW

Typical conditions (Class C, radio frequency power amplifier or oscillator)

Anode Voltage……8000Vdc

Anode Current……2.75Adc

Grid Voltage……－705Vdc

Grid Current……0.68Adc

Peak Grid Voltage……346V

Driving Power……710W

Anode Input Power……22KW

Anode Dissipation……4.8KW

Anode Output Power……15KW

Load Resistance……1437Ω (approx.)

Grid Resistance……1040Ω