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).
If it isn't safe are there any good alternatives? Rewiring the mic cable? using one of those isolation transformers?
Is this common or is the power supply potentially wired wrong?
tHanKYa.
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No ground lift on the mic pre - it's an FMR RNP, and the guitar
No ground lift on the mic pre - it's an FMR RNP, and the guitar is actually D/I'd into it's second channel.
BTW, I've tried a power supply that's for another tube mic I have, and it's dead quiet.
So now I'm wondering whether a hum eliminator like this one would be something to try:
http://www.artproaudio.com/default.asp?p1=3&p2=0&p_id=28&id=37
Does the preamp that the mic is connected to have a ground lift?
Does the preamp that the mic is connected to have a ground lift? Many do, but check it out to be sure. This will lift the ground on the mic-level signal and not on the power supply (a much safer proposition). I would try this or a mic cable with pin 1 disconnected at one end.