Bob Roddis has provided us with this audio clip (mp3) of Hayek on Bill Buckley’s Firing Line. Hayek explains that Keynes’ theory was not “general” at all, and that even Keynes himself agreed with Hayek that the Keynesian disciples could possibly use his framework to promote inflationary policies. Keynes (according to Hayek) promised to Hayek that he would rein them in “like that” (I think snapping his fingers) if they ever crossed the line, but Keynes died six months after this pledge.
BTW Hayek’s answer to Buckley at first is a bit hard to follow, because he refers to the interwar situation in Britain. I explain what Hayek is talking about here.