In a message dated 20/04/98 18:03:10, you write: << (The SMPS is an uninterruptable type with a battery pack that is trickle charged, so I could carry on erasing during a power cut!) Very useful!!! (NOT) >> Would it not be more advantagous to use a relay and change the tube to a white one (outside the shoebox) so that you could see during a power cut ? Just a thaught.......... Steve............