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Mic Power supply's a hummin-OK to use a ground lift adapter?

So there's one and only one thing in the studio here that introduces ground hum.

A power supply for a tube mic.

Everything's on one isolated circuit BTW.

A 3 to 2 prong ground lift adapter will silence this nutty piece o' hummin gear, but is it safe? (This mic will be used for a D/I'd electric guitarist who will be simulaneously playing and singing).