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Is my SM7b defective?

Hello!

I recently got a Shure SM7b but I suspect it's defective. I've only recorded vocals for one song with it but felt there was something off with the sibilance so I analyzed it with Voxengo Span and noticed that there is a weird dip at 6500 Hz. It looks exactly like if there was an EQ with a very narrow bell with a pretty large decrease in dB at 6500 Hz.

This is an average measurement using Voxengo Span. The audio is completely dry, the SM7b set to flat (i.e. no bass roll off or presence boost).

sm7b spectrum

mic repairs?

I have an oktava mk-012 and its got a lot of buzzing and noise when I hook it up with the phantom power. I switched the capsul with one that I know works correctly and still get the same problems which tells me the diaphram is fine. I know these mics are pretty cheap, but would getting it repaired be cheaper than getting a new one? Where can I go for mic repairs? I'm in the chicago area.