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I recently purchased a WW II magnetron magnet from an Ebay auction which I cleaned up and carefully touched up ( see photo below at the left). The photo at the lower right shows a 2J49 magnetron attached to the magnet.
magnet keeper
Next the above structure was mounted to the 2J55 testing stand ( see photos below).
The experimental set up is identical to that described in the 2J55 testing stand link. The Rigol DSO indicates the 2J49 appearing to be operating as rated ( 12KV at 12 amps). 
Cathode Peak Voltage KV
Peak Current
PFN
Magnetron Assembly
See 2J55 testing stand for details
RF Output Envelope 1N23 microwave diode detector
Video_1: 2J49
Video_2: 2J49
Video_1: Trigatron
RF Excited Neon Bulb