Is this a ferrofluid tweeter ?

[andyrlb]

I have these lovely Telefunken TL800 speakers and one of which has an issue with one super tweeter, it tests fine with the multi meter , I have replaced the caps to it , I have resoldered the joints , so I’m now thinking perhaps I just can’t hear it ( I can hear it on the other speaker ) .
Could this be a possibility if it is a ferrofluid tweeter in need of new fluid ?
If this isn’t the case then they will soon appear in private exhibitions



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[struth]

if its a supertweeyer you shouldnt really be able to hear it;just feel its presence. might be the one you can hear has wrong value cap

[walpurgis]

Highly unlikely that ferrofluid was used in a tweeter that old.

[andyrlb]

Cheers guys , been pulling my little bit of hair out , I’ll now do the caps in the other one then compare .


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[YNWaN]

Grant is right, in theory, but you can hear something from all the super tweeters I’ve ever encountered.

[andyrlb]

Well I’ve now replaced the caps in the other one and it’s working properly and I can hear the super tweeter, interestingly all the old caps tested fine too.
I have since removed the offending ST and rigged it up in line with a capacitor directly to the speaker wire and it IS working! So I am flummoxed .


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[Firebottle]

Broken wire? If the crossover is on a pcb check for cracked tracks, I had that in a sloppily mounted crossover board.

[andyrlb]

Broken wire? If the crossover is on a pcb check for cracked tracks, I had that in a sloppily mounted crossover board.

I replaced the wires too , could be a cracked track but I can’t see it if that is the case .


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[YNWaN]

Dry solder joint?

[andyrlb]

Dry solder joint?

Resoldered them all in the super tweeter circuit .
Cheers Mark
Given up now , they’ve beaten me .


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