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Old 18th December 2012
  #27
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All original Neumann U47 came with M7 PVC until ca. 1958 (some stragglers were still installed as late as 1961), after that year, almost all U47/48 came with the first generation K47/49 identified by a brass diaphragm ring.

Regarding which MG mics came with which era M7 PVC: you will need to check the year of manufacture, especially with those models introduced prior to 2005 that are still in production today. Things got tight around the bass on MG's M7 PVC capsules around 2005.

In all cases, let your ears tell you whether the mic sounds frequency balanced of hard in the mids.