The tweeter horn is broken, no resistance at all when measuring :-(
I opened it up but it seems like the coil winding is cut off.
So I took one of my piezo electric tweeters (Motorola CTS) and modified it (cut away the hopper) and glued it on the horn casting. A really quick and dirty work, but I think it will work quite well in the end!
The sound is a little bit harsh/bright so a capacitor in series with the piezo will reduce the level a bit.
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