I thought the ELAM 251 had an external power supply like most tube mics. I don't think it needs phantom at all. What do I know? I am the guy who started the rumor that certain old 57's sound better...
I guess I should stop judging things by how they actually sound and make more assumptions.
Here is my hypothesis: If not all Telecasters sound good, and not all U47's sound good, and not all LA2A's sound good, then may be some 57's don't sound good. Furthermore, a lot of older guitars, mics, and compressors sound superior to the newer versions of the same models. Perhaps this is also true of the SM57?
I have discovered by conducting my own listening tests that in some cases it is true. Virtually all of the new 57's I bought in the last 5 years don't sound as good (or at least they don't have the same mojo) and many of them have broken. Most of my old 57's work great and have nice character.
Don't take my word for it. Go try it yourself. Unlike the ELAM 251, these mics are cheap and plentiful. Pawn shops and music stores usually have one or two hanging around.