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According to the datasheet, BF200 is an RF transistor with high fT and very low junction capacitances. If it is used in an RF application, you probably cannot substitute BC547 or 2N2222, or 2N3904, or any other general purpose transistor.BC547 is commonly available here, and also is 2n2222... What do you think about replacing BF200 to any of these transistors?
No. You need to learn to read datasheets.Okay leaving BF200 aside.
Is BF494 equivalent to 2n3904, 2n2222, bc547?