In article
Richard A Downing wrote:
snip

Most tubes have a small glass 'pip' on the neck somewhere. It's said to
be quite safe to just nip it off with pliers. I don't know if this is
true, and like you, I'd only try it with full protective gear on!!!

When I was a lad we knocked the neck off an old TV tube and were most
disappointed with the resulting whoosh - we were expecting something
spectacular.