Cornfed have you read in your Accuphase manual where it tells you to NOT use contact cleaner on interior jack connections? They advise that cleaning solvents could deteriorate pc board resins at the connection point. This being the case, it's certainly nice that those plastic dust caps are at least included. While I can see their point regarding RCA center-pins bonded directly to board traces, this doesn't seem to be such an issue with XLR in's & out's. I Kontact only my cable's connectors, XLR pins & RCA ground sleeves (on the pre, when connecting to RCA inputs) & the IEC power prongs. I haven't read any such cautions regarding possible deterioration of board-resins within any other manufacturer's gear, but certainly this could be an issue & takes the utilization of dust caps from 'tweak' to 'necessity' regardless of their material composition.
