Try This Fun and Cheap DIY Home Studio Upgrade: The Transformerless SM57 Mod
How to remove the transformer from a Shure SM57 and SM58 - the transformerless mod tutorial -
SM57 Mod: Modifying the Shure SM57 Microphone | Tape Op Magazine | Longform candid interviews with music producers and audio engineers covering mixing, mastering, recording and music production.
Shure SM57 Transformerless and Granelli Mod | ZenPro Audio
Shure SM57 Transformerless ZenPro Mod | ZenPro Audio
How to remove the transformer from a Shure SM57 and SM58 - the transformerless mod tutorial -
Shure SM57 Transformerless and Granelli Mod | Reverb