After some time and trial and error there is a solution found to the ''stuck speaker'' problem found in many 70's beolits (707, 600, 505).

It's gonna take time and patience but if you're interested i can have it done for you: on a market in China town in Bangkok my friend (living in Bangkok) found a place where they can repair these speakers.

I think they change the coil, but at least i got them back playing and still 4 Ohm :).

So i can have your's fixed too if you like, just PM me (cost will be some 25,- euros for transport to/from BKK and efforts made, Chinatown is not exactly like going to Halfords....), the patience is needed because i have to give them with someone going there etc.

On other hand, if you have stuck speakers lying around, i'm interested, in that way i might make some ''stock'' and be able to swap.

PM me if this is interesting for you and don't worry: i'm not expecting to get rich on this one, it's just a solution to this long lasting problem...:)