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In ham radio the PA refers to a power amplifier which may or may not be the MOSFET type. In ham radio the PA refers to a power amplifier which may or may not be the MOSFET type. Pill - A slang term for the MOSFET popularized by bootleg [[Citizen Band]] operators using illegal power amplification. A CB user may refer to a 100-watt pill when discussing a linear amplifier connected between his 4-watt CB radio and his antenna. However, the pill specifically refers to a linear amplifier of the transistor type and not of the vacuum tube type. The term is criticized for being the invention of someone lacking a background in electronics and thus making a visual comparison to the shape of the round MOSFET to medication, such as an aspirin pill. It is incorrect to refer to a transistor as a pill. [[File:transistor_pill.jpg]]