boreas
"If it sounds good, it IS good." E.K.E.
AFAIK, all have interchangeable tweeters. I'm not sure about the others but they are also probably the same.
The tweeters are indeed interchangeable but it has long been maintained by folks in forums like this that there are two types, one slightly different from the other. One type was developed for the Model Six and can be found also in the Seventeen, Twenty, Thirty, Thirty-Three and perhaps others. The second type, developed for the Model Twelve, can also be found in the Five and Twenty-Three.
These are designated, and sometimes marked, M-12 and can be distinguished from the Model Six type by the thickness of the "top", or inner plate of the magnet assembly. On the Model Six type the top and bottom plates are the same thickness but the top plate on the Model Twelve type, the M-12, is significantly thinner than the bottom plate.
There is a KLH service bulletin, #59, in the library at the Classic Speaker Pages. It was mentioned early in this thread. On the chance that you missed it, I've attached it to this post. The photos are terrible and the description only says that the top plates are of "different thicknesses" but we've seen in this thread examples of the M-12 and the "M-6"? tweeter which show that the M-12 has the thinner of the two top plates.
The information about two different tweeters has been around for a while but it has never been clear, at least to me, exactly how to tell one from the other. We now have authoritative information from the original source concerning the different top plates and information from posters here as too the exact nature of that difference. We also have learned that the screen is affixed to the flange with a different color adhesive for each type, a sort of putty or khaki color for the Model Six tweeter and a darker more or less honey color for the M-12.
So, this sort of encapsulated the knowledge gained in this thread over the course of some 40 posts. Hope this helps.
John
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