microphone Neumann UM 57

The Neumann/Gefell UM 57 was a large-diaphragm tube condenser microphone manufactured by the Neumann company of Gefell, Germany, currently known as Microtech-Gefell. The mic used the Gefell company`s famous M7 capsule. This was a dual-diaphragm, center-terminated capsule with a PVC (plastic) diaphragm. It supported three polar patterns via a switc
microphone Neumann UM 57 - schematic

h on the power supply: Cardioid, Omni, Figure of 8. The UM57`s legacy was celebrated during Microtech Gefell`s 75th anniversary in 2003, with the introduction of the limited-edition UM 75, which was presented as a recreation of the UM57. However, numerous differences existed between these two microphones: Due to age, and a shortage of high-quality audio components in East Germany when these microphones were made, many UM57 microphones underperform their potential. Oliver Archut of AMI/Tab-Funkenwerk suggests numerous modifications to move the [microphones] closer to the full potential of [the] M7  capsule:

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