MagnetoSound said:A couple of points ...
1) U87p is the early low impedance version, transformer strapped for 50Ω and has 47R build out resistors for optional signal pad (bypassed in 'standard' U87)
2) The U87/U87i also has a balanced RF filter on a little PCB in the connector housing, comprising two series inductors (47uH) and two shunt capacitors (330pF), which is standard regardless of whether 7-pin or XLR version
These are two separate features, best not confused.
HTH.
Agree.