Check out the productions of the ZBS Foundation (
www.zbs.org). I first heard "The Adventures of Ruby" almost 30 years ago, back when the CBC broadcast a lot of radio drama, both CBC produced and purchased. Alas, the CBC no longer produces any radio drama. One of the last shows was Afghanda, an truly outstanding series. ZBS has continued to produce the Ruby series along with the Jack Flanders adventures and are beautifully produced.
I went to a boarding school, and I remember listening to Johnny Dollar, Gunsmoke and others after lights out. This was on a small portable radio that used subminature tube (small tubes with wire leads) and assorted B-batteries (in 22.5, 45 and 90 volt sizes). This was in the late '50s.
The Internet Archive is a wonderful resource. They have all the available Suspense episodes, probably the best radio drama series of all time. They also have other shows like Dimension-X and X Minus One.
I just took a quick look and both "Nightfall" and "Vanishing Point", two series from the CBC in the '80s are available there. They were excellent. I miss real radio.