The single most expensive individual replacement component in a residential microwave oven is almost always the magnetron tube, followed closely by the main electronic control board assembly and the high-voltage transformer. Because the magnetron is a precision high-frequency vacuum tube engineered with permanent magnets and delicate internal antenna structures, manufacturing it requires specialized materials that drive up part costs. You can evaluate component pricing by checking appliance parts catalogs. You can verify fair value when replacing a failed magnetron or control board restores core operational functionality to an expensive built-in over-the-range microwave.
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