OK guys...really appreciate any thoughts.... I have an Ep Viola bass (which sounds great BTW) apart from the hum I have hum when facing the amp or with my back to it. Hum disappears if i have my bass end on to my amp (either end doesn't matter). Also dissapears if bass is side on to the amp. Wouldn't be so much of an issue if i could have a decent distance from my amp but most gigs i do this isn't practical. Now for some details: The PU's are mini humbuckers with a VVT arrangement. There's a working ground attached to all pots, the metal PU covers (enclosing the PU's), the bridge and strings. Hum is not effected by whether i touch any part of the bass or not. There is no shielding inside the bass (would be kind of hard to get it in the hollow body but not impossible...just v fiddly). Hum does not increase/decrease if i have both PU's on max or just 1 PU on. Amp doesn't show any hum with any other bass i have (including a 50's single coil P bass) Is the hum a shielding issue? Or could it be something else eg. rubbish PU's or electronics?