I guess one question might be which of their meters you are using?
On some meters, a 1.0 is how they indicate that you are over the measurable limit (a good thing for 13), which is a little annoying, as actually having 1 Ohm there would be a horrible thing. Since you say it climbs slowly, I would imagine that you're OK on that one.
Is the center pin referring to the 9 pin socket or one of the RCA jacks?
If its .8 to .9 Ohms, that shouldn't present a problem. If it's .9K or .9M, that would be a bad thing on the center pin of the 9 pin jack.
-PB