Hi all, thanks for all the comments and help - truly appreciated! On the tech - absolutely right - the guy I used here is good but pro-audio is not his main field. This is big mains stuff and needs to be handled properly. On the 'blue flash' on tripping - again, thanks, this is reassuring (I don't have a problem with pyrotechnics but I do get a bit edgy when my amp appears to be the source) The design fault comment is probably not too far wide of the mark...maybe a design 'issue' though - Aguilar did try to address this with the inclusion of a thermistor (of particular importance in the UK) - it seems to work in most cases but my unit appears to have a different/more extreme problem. No criticism of the company though - the DB750 is a truly exceptional amp in conception, design and performance (in my opinion, of course) and the help from the tech department is simply first rate! On inrush current - yes, it's 7.5Ax240v - 1800 is what I thought (err...what I was told by the local tech) but Aguilar confirm that it can be much higher on start-up. If you've not seen inside a 750, it's worth it - the guts are incredible (and incredibly heavy). Thanks for the insights and help - I'm really impressed!