The M1556 from Nisshinbo Micro Devices Inc. is a Magnetron with Frequency 3.025 to 3.075 GHz, Anode Voltage 8.5 to 9.5 kV(Peak), Peak Anode Current 10 to 17 A, Output Power 55 to 60 kW(Peak). Tags: Fixed Frequency. More details for M1556 can be seen below.