I'm quite curious about vintage JA shows, too. Everyone knows the story of how Mikey spun reggae at a time when it wasn't on the airwaves in JA (specifically on the JBC). But, as the Heartbeat release Upsetter Shop Vol. 2 shows us, there was reggae on the radio in the late 60s / early 70s. Scratch sponsored a show on the JBC where his latest records got played.
Is there a way to dl that show from the blog or is it just a streaming ? Besides, Duke Reid also had a radio show and Bunny Lee spent a lot of time at the radio stations "plugging" records : i have heard that he was rather "convincing".