I have long been fascinated by the original Polk speaker, as evidenced by my very first post here in 2004.
Thanks to xoaphexox (http://www.polkaudio.com/forums/show...hlight=model+9 ) a pair of Polk Model 9A's has made the trek northward to Massachusetts.
s/n's of these two 9A's are 44509 and 44596. There is a Model 9 pictured elsewhere in these forums with s/n 43215.
There is a fair amount of information on the original Model 9 and the "new and improved" Model 9A to be found here, of course (e.g., http://www.polkaudio.com/forums/show...97&postcount=4 )
The original used the Motorola "lemon juicer" piezoelectric tweeter; the 9A used the Peerless KO10DT silk dome tweeter. The 9's grille was nonremovable. The 9A had a removable grille held on with "super Velcro" (like the original Model 7 and 10).
So... my question is simply this: does anyone here know the years of production for the original Model 9 and for the Model 9A? As I earlier mentioned, a pair of the original Model 9's was installed in the student pub at Johns Hopkins prior to 1976. FWIW, I never saw a 9A during my mis-spent youth, hanging around at Soundscape in Baltimore (ca. 1976 to 1980). I am really curious about this, as well as any other remaing tidbits on these historically significant :-) tower speakers that haven't already been posted here previously.
Thanks for your attention!