I'm fixing up and calibrating a 1502 I put together from 2 that were bad. The manual keeps referring to an "adapter BNC to probe" Tektronix p/n 013-0130-00. I have no idea what this is! The connector on the 1502 is BNC as is the connector on the P6106 probe. I've looked through old Tek catalogs and cannot find that part number. Help! 73, Roger