OK this has been puzzling me for a while now and it struck me as more strange, having just bought a new DB and when I check its tuning, this is always flat and I have to tune it up - same with all the BGs I've ever owned. But with my NS CR5 EUB - every time I check it, against tuners or piano etc - it is always sharp, I've never caught it being flat - this just strikes me as bizarre? I mean I can understand strings streching or tuners slipping and making things flat - but why does my EUB always go sharp? I have to know!!