The magnetron has failed ... It generally doesn’t make sense to repair a microwave that’s more than 7 years old. Instead, look at new models that may be more energy-efficient or offer useful ...

The cavity magnetron is a power RF oscillator device ... and it lies at the heart of a domestic microwave oven. They usually need a high-voltage mains transformer and a rectifier to work, but ...

Clearly, as your bog standard microwave oven can only handle at most one kilowatt; the ‘oven’ needed a bit of an upgrade. A 16 kW water-cooled magnetron. Why not over-drive it to 20 kW for fun?

The post-war period saw a proliferation in magnetron applications, beginning with the invention of the microwave oven in 1946 and continuing today with base stations for LTE and 5G networks.