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Ja, das hat Sinn. Meistens hat man einen "ground lift" - Schalter genau dafür. Ok, hier ist es mit Jumper gelöst.[/QUOTE]
Hat nichts gebracht, die Jumper zu entfernen. "Ground - Lift" Schalter hats ja auch, bringt auch nichts.
JP Gerard von NoHype hat folgendes geantwortet.
"Sounds electronic, can you try the LRM-2b in another mic pre with a different chain. Since your tests with other preamps don't show the problem, it's very possible that the mic pre is acting up. It's almost impossible to generate this with a passive ribbon. Yes, 500 Ohms output nominal, so anything over 3KOhms is ideal, under you'll most likely lose some bass response. the mic pre may also not like the higher output Z. A Fethead could be a solution but I suspect a problem with the preamp in this case, which you hear from the ribbon because it has a lower signal so needs more amplification. A condenser mic, sending more level, would drown the problem with signal or float above the problem altogether."
Also mir wächst das langsam über den Kopf, versuche noch zu messen und sonst schick ich das Mic und den Preamp ADT Audio ein.
Gute Nacht.