Sequential ordering depends strictly on the specific model line.

If:

5-digit numbers. Transition to the modern Sennheiser ownership era (post-1991). Introduction of the U87 Ai. U87 Ai, TLM 170

For nearly all Neumann mics produced after 1950, the primary serial number is engraved or laser-etched on the , just below the output connector (XLR). On side-address mics like the U 87, it’s on the back side opposite the grille. On pencil mics (KM 184, KM 84), it’s on the main tube near the XLR.

If you encounter any of the following issues during your check, proceed with extreme caution:

: Vintage U 87 models often feature a secondary stamped number inside the housing. Small Diaphragm Condensers (KM 184, KM 183)

Ensure the serial number on a tube microphone matches the vintage or style of its accompanying power supply unit (PSU).

The swivel mount (e.g., SG 1 or SG 2) should be solid metal. A plastic mount is a red flag. 5. Suspiciously Low Prices