A very big thanks and thumbs up to this wonderful forum member. My K1000 is playing now flawless as the faults mentioned in this thread were perfectly repaired.

Can't measure, it sounds quite harsh. As my technical English is quite bad, l ll explain in german: Die Verzerrungen hören sich schnarrend an, als ob die Membran Kontakt hat oder ein Fremdkörper im Weg ist, oder defekt ist. Allerdings ist im ausgebauten Zustand nichts davon zu sehen. Mit einer...

Hello Heinz,   great insight on this headphone. So I reconnected my one after about 10 years again. Unfortunately there are low frequency distortions in the left. Anything you recommend to do? Thanks.   And a Hello from the netherlands to all forum members of course.