Artist Christian Marclay has been manipulating records and turntables in a very un-Hip-hop manner since anyone else has (Hip-hop or otherwise). As someone who creates new compositions out of old ones using turntables and records, he very well might be the first turntablist.
His turntable work involves scratching, bending, breaking, cutting, reconfiguring, and otherwise repurposing records in order to mine their hidden sounds, intended as well as inadvertent.
During a brief web search the other night, I found the following mini-documentary (runtime: 5:50) about him. Enjoy.