I have a GE Space Saver 2 microwave oven that lost the magnetron 4 month ago. Replaced it...oven worked fine for 2 months. Then failed again...this time I traced it to the HV Diode and replaced it. Oven worked fine for 4 weeks. Then failed again....HV Diode failed again...replace oven worked fine...3 weeks later diode failed a third time.

Each time after replacing the magnetron and diodes, I check the circuit voltages and everything was within the norms according to the GE test specs.

Obviously, something is amiss and I'm currently at a loss as to determine and fix the problem. I would appreciate any advice you could provide.