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T27 dented domes
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eastmarinedrive
Introductory Contributor


Joined: 10 Jul 2003
Posts: 1
Location: Queensland

PostPosted: Thu Jul 10, 2003 10:57 am    Post subject: T27 dented domes Reply with quote

Dear Kef Fans

What is the best way to deal with dents in T27s

Howard
(Queensland) Rolling Eyes
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David
Intermediate Contributor 75+


Joined: 11 Jun 2003
Posts: 90
Location: Canada

PostPosted: Thu Jul 10, 2003 4:12 pm    Post subject: Reply with quote

Howard, I have a solution.

I had read on the Naim site that people had tried vaccums to try to pull the membrane back. I understand that the driver is actually underneath and the dome is just for dispersion. One guy even sucked it back without any other mechanical aid. Talk about obsessive.

I used a soft plastic tube about 3/8 to 1/2 inch outside diameter which I use to drain the kids aquariums. I put one end to the dome just touching, and gently pulled in some air. Wonder of wonders, the dome pulled back, very quickly. You can't tell it had been pushed in before at all.

Apparently the T27 is very soft, but because it is a plastic or plasticized material, the tube works great.

By the way, I can't tell the difference audibly between the two speakers.

Good luck,

David
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terry
Senior Contributor 200+


Joined: 22 Apr 2003
Posts: 262
Location: UK

PostPosted: Thu Jul 10, 2003 8:48 pm    Post subject: Reply with quote

David wrote:
One guy even sucked it back without any other mechanical aid.


David
You will never guess who that guy was. Yes I am that person! The mouth method works very well except with minute dents. The plastic dome is very easily sucked out. The tube approach may very work better for smaller indentations. Now my secret is out.
Terry
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terry
Senior Contributor 200+


Joined: 22 Apr 2003
Posts: 262
Location: UK

PostPosted: Thu Jul 10, 2003 8:50 pm    Post subject: Reply with quote

By the way Howard welcome to the forum. It is never busy but it is always here for people who are interested in old KEF drive units. Hopefully we will pick up a few more members over the next few months.
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David
Intermediate Contributor 75+


Joined: 11 Jun 2003
Posts: 90
Location: Canada

PostPosted: Thu Jul 10, 2003 8:59 pm    Post subject: Reply with quote

Terry, was it good for you? It was good for me.

David
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terry
Senior Contributor 200+


Joined: 22 Apr 2003
Posts: 262
Location: UK

PostPosted: Fri Jul 11, 2003 3:31 pm    Post subject: Reply with quote

David
I couldn't hear a difference even when it was dented. My young daughter years ago I think stuck her finger into a T27 and I lived with it for years in its dented state. It sucked out beautifully easily once I summoned up the courage to try it. Since then I have done others but occasionally I am left with small indents at the extremities of the former dents. Perhaps these can be sucked out with a fine tube. I think the domes are just dust covers but others say the shape alters the sound. My feeling is that if they do alter the sound the difference is slight.
Terry
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David
Intermediate Contributor 75+


Joined: 11 Jun 2003
Posts: 90
Location: Canada

PostPosted: Fri Jul 11, 2003 3:54 pm    Post subject: Reply with quote

Sorry Terry, I was just making a bad joke. I hope you weren't offended.

The domes just work for dispersion. I would think that if the fine dents were at the sides only the off axis sound would be affected. The tube I think would remove the remaining dents.

David
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terry
Senior Contributor 200+


Joined: 22 Apr 2003
Posts: 262
Location: UK

PostPosted: Fri Jul 11, 2003 5:08 pm    Post subject: Reply with quote

Sorry David
I am well known for being slow in understanding humour.
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b3rtie
Junior Contributor 10+


Joined: 02 Jun 2003
Posts: 19
Location: loughborough UK

PostPosted: Thu Jul 17, 2003 7:43 pm    Post subject: Reply with quote

Whilst borrowing a pair of a friends Cyrus 780s I dented the bass/mid dome. Was too awkward to get my nose in (its dead big u see...the nose, not the speaker!) so I resorted to surgical syringes (without needles). didnt work either (cant seal themagainst the surface), so I got some blu-tac.... and got it really warm (not too warm as it breaks up) - with the help of a hair-dryer and rolling inbetween my fingers, then stuck it on the dent of the dome, quite well padded around the dent. when the blu-tac cools a bit it becomes ridgid enough to pull on and thus the dent can be pulled out. There were some very fine dents also remaining on the dome.

There must be small enough vacuum machines to do this, like smaller versions of the suckers used for fitting car windscreens pehaps?
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terry
Senior Contributor 200+


Joined: 22 Apr 2003
Posts: 262
Location: UK

PostPosted: Thu Jul 17, 2003 10:30 pm    Post subject: Reply with quote

Good idea. It is amazing the uses to which we can put blu-tac.
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b3rtie
Junior Contributor 10+


Joined: 02 Jun 2003
Posts: 19
Location: loughborough UK

PostPosted: Thu Jul 17, 2003 10:43 pm    Post subject: Reply with quote

yeah! I once fixed the hupcap badge to the hubcap on my mothers MGB roadster after I pulled it off. It took my Dad about 6 months to notice and only after he knocked it of during a wheel change!
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qguy
Intermediate Contributor 75+


Joined: 08 May 2003
Posts: 85

PostPosted: Fri Jul 18, 2003 2:07 am    Post subject: Reply with quote

Well having a 3 year old and a 2 year made me an expert on dents...anyways I used masking tape.....works for me !!!

I still wonder how they learned to remove the metal covers on the midrange and tweeters of the KEF 105/2 Ls.....
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terry
Senior Contributor 200+


Joined: 22 Apr 2003
Posts: 262
Location: UK

PostPosted: Sat Jul 19, 2003 6:28 pm    Post subject: Reply with quote

Yes I suppose masking tape would do the job. Another good idea.
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proffski
Über Contributor 1000+


Joined: 22 Aug 2003
Posts: 1297
Location: Tewkesbury UK

PostPosted: Wed Aug 31, 2005 6:35 pm    Post subject: Reply with quote

Yep, I'll confess to being a sucker for tweeter domes...
Have also seen people use various sticky tapes with care, the bluetak idea deserves a star!

This used to happen a lot when I was in retail, wished we had speakers with plasma tweeters.

That would have learnt them! Cool
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helios102
Introductory Contributor


Joined: 15 Sep 2005
Posts: 9
Location: Loughborough, UK

PostPosted: Sun Sep 18, 2005 10:18 pm    Post subject: T27 Dented domes Reply with quote

Just sorting out today through my Bits and Pieces when I was horrified to find one of my T27's (spares for my LS3/5a) had a dented dome. I pretended I hadn't seen it (hoping it would go away) and consoled myself by surfing through the letters in this Forum.

Lo an Behold! A Solution!

I have just picked up the poor T27 and given it The 'Terry' Kiss of Life - it works!! Now I must find a better place to store it!

Thanks,
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Tony
(Bogers LS3/5a+AB1)
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