The MAF1421B from Nisshinbo Micro Devices Inc. is a Magnetron with Frequency 9.38 to 9.44 GHz, Anode Voltage 3.4 to 3.8 kV(Peak), Peak Anode Current 2 to 4 A, Output Power 3.6 to 4 kW(Peak). Tags: Fixed Frequency. More details for MAF1421B can be seen below.