Mxl 990 mod This opens the head basket somewhat, leaving the heavy outer layer for strength and the fine mesh second layer for RFI and hum protection. It will go head-to-head with the industry standard U 87 Ai. pdf. buymeacoffee. The standard MXL mass-produced circuit board is replaced with our BFM Transformer-Coupled Circuit and high quality Transformer. 00 So yes, top notch components do make a difference. MXL V63M), and the Medium-Format Mics (MXL 990/770, Monoprice 600800). This is the follow-on article from the previous blog post on the MXL990 modification. This later version of the SCM-900 can be modified using our 990 mod kit. An MXL 9000 with the extra grille removed, upgraded 1000pf capacitor and an Oktava MK319 capsule. raojagyqsafuymcprkafawxelxlklbyfznuvkbffdgflvrrkglkvghvsqyjxubogijutiquexhmtqog