Hello! On Mcintosh Service manual (for example for mc-2155 unit) there are pieces in parts list markers with asterisk mark (*) and also there is a mark: *Parts marked with an asterisk (*) are replacement parts stocked our Service Department and must be ordered from Mcintosh. These parts must be ordered by part number. Parts not marked my be obtained from electronic parts suppliers. The question is what is special about hat parts with asterisk? Does Mcintosh conduct some special selection of components to precisely match? Or back in the time that components had not been widely available? And another question regarding parts list number on shcematics: C710 066353 ELECT, 100uf, 50V …. (7484) Where: C710 – number on schematics 066353 – McIntosh part number ELECT – electrolytic 100uf, 50V – nominals And what represent this number --> …. (7484)? Thank you.