Circle of Fear

I remember watching this TV series on occasion back in the 1970s. Unfortunately since it's been 20-25 years since I've seen it, I no longer remember any of the episodes. The only thing I remember clearly is the sound effect that was played whenever a ghost was present. Before reading about this on the IMDB I did not know that it was later re-named Circle of Fear. That was new to me. To me it was always Ghost Story. I remember that I always found the show interesting enough to watch it till the end. If you can find this on video (It's extremely hard to find), I highly recommend it. I did find one source for it on video, some years ago and purchased one episode that starred John Astin and Patty Duke Astin. This episode was from when the series had been re-named Circle of Fear. Very entertaining if you can find it. Maybe some day the Sci-Fi Channel will pick it up. Who knows?