www.crazyfishfarmer.com Be aware off disassembling a magnetron! Some types contain beryllium oxide ceramic insulators. Beryllium oxide is very dangerous if inhaled. Lead to berylliosis, an nasty incurable lung condition. http en.wikipedia.org modhurin08 There are 2 magnets present (usually samarium cobalt type) to give a uniform B field inside the tube. Without a uniform field from cathode to anode, the electrons won't follow a trajectory that remains inside the resonator cavities, hence giving poor or no microwave output. And, word to the wise: you can't tell by looking if there's BeO in the ceramic. No magnet is worth a painful death...just buy them for Taking apart a magnetron from a microwave for the magnets...