Yes, microwaves do have magnetrons. A magnetron is a key component of a microwave oven that generates the microwaves used for cooking. It is a vacuum tube device that converts electrical energy into high-frequency electromagnetic waves, specifically in the microwave frequency range.
Regarding the lifespan of magnetrons, they can indeed wear out over time. The magnetron contains various components such as a filament, anode, and cathode, which are subjected to wear and tear with regular use. The filament can eventually break, and other components may degrade, leading to a decrease in performance or a complete failure of the magnetron.
The lifespan of a magnetron can vary depending on several factors, including the quality of the magnetron, frequency of use, power levels used, and maintenance. On average, a magnetron can last anywhere from 5 to 10 years in a typical household microwave oven. However, it's worth noting that this lifespan can vary, and some magnetrons may last longer or shorter periods depending on the aforementioned factors.