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Jingguang brand FU-611F and FU-611FT electronic tubes are of metal-ceramic structure, thorium tungsten carbide cathode and forced air-cooled triode. The filament and grid are of coaxial structure with low distributed inductance. The maximum operating frequency can reach 110MHz and the maximum anode dissipation power is 4kW. It is applicable to FM, AM, TV equipment and industrial heating equipment. FU-611F electronic tube can be interchanged with 3CX2500A3 made in the United States. The core of FU-611FT electronic tube is equipped with a radiator, which improves the cathode heat dissipation performance and is more suitable for dusty environment. It can be interchanged with TH5-6 electronic tube produced in the United States.

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