He told website Spinner.com: "I never wrote on an acoustic guitar before. I bought the guitar about four years ago.
"I had old, crappy nylon string ones before. But I bought this guitar, fell in love with it and fell in love with playing it as I wrote for the new record. It was really just fun.
"I'd sit around with friends, drink wine and just keep playing, playing, playing."
Singer Alison has previously admitted the group's methods for writing songs is unorthodox, with her and Jamie working largely independently of each other.
She explained: "The way we both write songs is, we're in the same place, but we're both in different rooms where we can't hear each other, writing at the same time.
"Then we meet up and play each other what we're doing, and then there's a response."
Jamie has also admitted that the recording of 'Blood Pressures' - the band's first album for three years - was delayed by Alison's commitment to her other band, but said it was worth it because of how it boosted her confidence.
He said: "I really noticed the change in her voice when she came back off tour with The Dead Weather. It had become so strong. There was more confidence there."
'Blood Pressures' is out now.