Tannoy 'Oxford' T125 HF Driver - Ferrofluid replacement

[Kanders1]

Has anyone ever changed the "Ferro fluid" in theses units..? (Driver model No. 1108B)

I have been in touch with Tannoy and the answer I received was they are not serviceable... helpful.

I have seen the fluid available.. just wondered if its all the same viscosity etc...? some places state they are selling Tannoy fluid..?

any help greatly appreciated..

Cheers

[spendorman]

I think I had these apart years ago, one of mine stopped working. Don't remember seeing ferrofluid in there. Tweeter coil was open circuit though. Audax made unit I believe. Bought two second hand ones on ebay, both no good.

[Kanders1]

Cheers..

One of mine was not working.. when I checked the coil no reading at all so took it apart and there is fluid inside... brown and crusty... I have a new 'used' one coming. Just wondered if anyone had done this job...?

[spendorman]

Perhaps the brown and crusty was burnt out coil not ferrofluid. I was thinking of fitting a different tweeter to the horn, looks possible.

[Kanders1]

Nope... defo fluid I poured it out... the original spec quotes the use of the fluid...

http://www.hnny.nl/archief_tannoy/pd...-cambridge.pdf

[struth]

Parts express and simply speakers do kits i think.. Dunno about oxfords though.

There was a guy on emotiva lounge did a walk through for doing tweeters, that might help

http://emotivalounge.proboards.com/t...fluid-tweeters

[spendorman]

Nope... defo fluid I poured it out... the original spec quotes the use of the fluid...

http://www.hnny.nl/archief_tannoy/pd...-cambridge.pdf

Ah, OK then. I think that the crossover uses electrolytic capacitors in it. I would replace these as they are likely to off by now, could be one of the reason the tweeter failed.

[Kanders1]

I swapped the good tweeter over to check... all good there. But yes that's on the list.. cheers

[Kanders1]

Ah, OK then. I think that the crossover uses electrolytic capacitors in it. I would replace these as they are likely to off by now, could be one of the reason the tweeter failed.

If the cap in that speaker is failing would the good tweeter still work..? or are you saying that its a cause and over time will make a replacement unit fail..?

Cheers

[spendorman]

Quite possible that the new tweeter will work, but the old capacitor(s) could kill the new good unit.

Happens quite a lot in old KEF speakers. T27's blown by bad electrolytic capacitors. They can increase in capacitance, lowering the crossover frequency, putting more power through the tweeter than designed.