Normans are harder to price than your run of the mill Pioneer HPM's or popular JBL's... I think the 9's run around $250, but I may be confusing them with another Norman model.
If they are a certain vintage they can bring more than $250 if in very good condition, but I'm not the expert. I paid $120 for my Tens and are well worth it.
I paid $100 for my Tens in need of a refoam. 9's should be worth more - I would picture in the neighborhood of $200-500 wouldn't be unheard of if you could find the right local buyer.
Gotcha - that would peg these as '78-79 I believe - the later models used a foam surround and poly cone woofer instead of the rubber surround/paper cone used in the early 9's.
Gotcha - that would peg these as '78-79 I believe - the later models used a foam surround and poly cone woofer instead of the rubber surround/paper cone used in the early 9's.
Well, not so fast. They could be a lot older and not as valuable, but still good sounding. It's the tweeters that improved during that period in gradual steps. What you want is 1978-9 or newer. Older tweeters had a pretty crude screen over them and were prone to blowing out. Then they started using a real phase plug and ferro-fluid in the gap, and a better protection circuit. Granted, that involved a light bulb in the crossover and then circuit breakers that have to be cleaned every so often, but they sound great... best of the series.
A lot of great input has already been given. Are the glass tops still there? A lot of them have been broken or somehow destroyed by now. Depending on condition, I have seen them go anywhere from 200-750. I have seen some sellers ask a lot more, not sure if they got what they were asking though. Good luck with your search.