I used to have a copy, but it was terrible quality as well. So I can’t help you, but I just wanted to say that I agree about the film version. It was crap. They butchered it. Screwed up all the funny bits.
I wish HBO would release this on DVD as the movie version of Camelot sucks. I also recall some other stage plays on HBO from that time period that I would like. I remember a Sherlock Holmes with Frank Langella and a play with Matthew Broderick that I would like to own.