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View Full Version : Is this a ferrofluid tweeter ?


andyrlb
02-11-2018, 09:50
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 [emoji35]
https://uploads.tapatalk-cdn.com/20181102/a2f28745911aa8aabffd96f1f106f1e8.jpghttps://uploads.tapatalk-cdn.com/20181102/bc9e9e069c77b4e2e27a246c5cc0799a.jpg


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struth
02-11-2018, 10:03
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
02-11-2018, 10:05
Highly unlikely that ferrofluid was used in a tweeter that old.
andyrlb
02-11-2018, 10:08
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
02-11-2018, 10:13
Grant is right, in theory, but you can hear something from all the super tweeters I’ve ever encountered.
andyrlb
02-11-2018, 10:57
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
02-11-2018, 11:00
Broken wire? If the crossover is on a pcb check for cracked tracks, I had that in a sloppily mounted crossover board.
andyrlb
02-11-2018, 11:02
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
02-11-2018, 12:13
Dry solder joint?
andyrlb
02-11-2018, 12:14
Dry solder joint?

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


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andyrlb
09-11-2018, 10:08
And they’ve now been working fine [emoji16]
It was the soldered connection on the super tweeter.


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spendorman
09-11-2018, 10:17
Good result
walpurgis
09-11-2018, 10:28
And they’ve now been working fine [emoji16]
It was the soldered connection on the super tweeter

I figured it was something like that.

The filter cap values suggest it's not really a supertweeter as output should be audible in the upper treble.
andyrlb
09-11-2018, 10:33
I figured it was something like that.

The filter cap values suggest it's not really a supertweeter as output should be audible in the upper treble.

Yes I can only here it if I place a the kitchen paper roll over it ( the other one the same )


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