Yep. It's fine.
You need insulated grounds for safety grounds (which this is not), but if it contacts any other metal which could have a potential it could put a lot of noise into your phono. I'd suggest you pick up any cheap hook up wire from Parts Express or the like.
You need insulated grounds for safety grounds (which this is not), but if it contacts any other metal which could have a potential it could put a lot of noise into your phono. I'd suggest you pick up any cheap hook up wire from Parts Express or the like.