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For sale is a very rare vintage Neumann NKM power supply. We have three total available. Listed price is for a single PSU. They come as shown in the photos. #1620 doesn't have a power cable, #1647 has cable mod, #1621 has original cable. All three tested good. All three have original caps (we can recap for additional cost if desired, contact us for a quote). These are used for Neumann mics including KM53, KM54, KM56, KM63, KM64, KM66, SM69, M269c, Schoeps M211b, M222 and other mics equipped with an AC701 tube.