Looking at the channel line up for Tulsa on Cox's website it does not show channel 73 listed as of yet (check link below). However, all channels over 63 are tagged as "digital only" which means they need to have a cable box to view them. I think you can say based on that it's a channel that can't be viewed on analog. I'm actually in OKC so I can't verify it unfortunately.
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ww2.cox.com/residential/ ··· =goog_tv