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m.elmslie
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Joined: 17 Dec 2011
Posts: 7
Location: FRASERBURGH
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 Posted: Mon Dec 19, 2011 1:18 pm Post subject: Rebuilding a pair of Kef 105 Mk I's T52 Replacement ? |
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Hi,This is my first post on here as a new member.Although new to here i'm not a Kef newbie.Ten years ago I bought a very rough set of Kefkit 3's and rebuilt them into my own cabinets complete with an off board upgraded crossover supplied by Falcon Acoustics.They've amazed me ever since and i've yet to hear anything that comes close.
Recently a friend gifted me his knackered 105's He aquired them,off freecycle of all places,a year ago intending to do them up himself.Now however he and his family have decided to emigrate to Australia.
So far i've manage to pull all the pushed in cones out using some blu tack and the hoover but i need to find a t52 sp1049 as one was missing and had been replaced with what looks like a maplins special!
They seem to be few and far between even on ebay!So my question to the experts on this forum is what would be a suitable replacement and what would i have to change on the crossover to say substitute t27's in place of the t52's.I have no knowledge of electronics,when I bought the crossover from Falcon a very nice man there drew me a laymans drawing of what wire went where to effectively build a biwired crossover!So words of one sylible and lots of pictures would be very welcome.
Hope somebody can help me out.
Regards
Martin [/img] |
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speakerguru
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Joined: 18 Nov 2005
Posts: 1192
Location: Green Hut, Tovil
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| Posted: Mon Dec 19, 2011 3:26 pm Post subject: |
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Welcome to the forum.
Re your 105s, there's nothing close to a T52 in response or impedance as far as I know. The T52 was sold separately for Constructor Series so some may come up on eBay eventually. Other than that, maybe a letter to Father Christmas....... |
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ColinR
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| Posted: Mon Dec 19, 2011 3:29 pm Post subject: |
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| Quote: | | They seem to be few and far between even on ebay |
A pair were sold yesterday for £70, so keep your eyes open!
| Quote: | | what would be a suitable replacement |
Nowt!
| Quote: | | and what would i have to change on the crossover to say substitute t27's in place of the t52's. |
You wouldn't, as time aligned speakers have all voice coils in a single plane. i.e. drastic woodworking would be required.
| Quote: | | I have no knowledge of electronics |
Ouch.
| Quote: | | when I bought the crossover from Falcon a very nice man there drew me a laymans drawing of what wire went where to effectively build a biwired crossover! So words of one sylible and lots of pictures would be very welcome |
Unless there is a speaker designer nearby who will trade technical help for a large quantity of single malt you'll just have to wait for what turns up on sleezeBay.
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ColinR
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| Posted: Mon Dec 19, 2011 3:46 pm Post subject: |
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speakerguru | Quote: | | The T52 was sold separately for Constructor Series |
That was the SP1072 as an alternative to the SP1049 with a faceplate.
Although both appeared in the Ref 105-2 I'm not sure about the mounting holes in the Ref 105.
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speakerguru
Über Contributor 1000+
Joined: 18 Nov 2005
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Location: Green Hut, Tovil
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| Posted: Mon Dec 19, 2011 4:51 pm Post subject: |
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| ColinR wrote: | That was the SP1072 as an alternative to the SP1049 with a faceplate.
Although both appeared in the Ref 105-2 I'm not sure about the mounting holes in the Ref 105. |
 Oops I forgot about that. You might feel brave enough to mod the head cabinet though. Much more do-able than a blind crossover re-design. |
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audiolabtower
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Joined: 06 Jan 2009
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| Posted: Mon Dec 19, 2011 7:31 pm Post subject: |
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Yes, you need the SP1039 with the circular faceplate and circumference top and bottom cut across to a straight line.
T27 would be a mistake and needs a crossover redesign, much lower power handling and woodworking. I would put an email trigger search into eprey and have some patience. If you can get them working to spec again it will certainly be worth it. Good luck. |
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m.elmslie
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Joined: 17 Dec 2011
Posts: 7
Location: FRASERBURGH
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| Posted: Tue Dec 20, 2011 10:39 am Post subject: Many thanks |
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| Thanks for the answers lads.Guess i'll just have to be patient and hope one comes up on fleabay or even better a matched pair. |
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T.O. Chef
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Joined: 31 Aug 2007
Posts: 187
Location: Toronto Canada
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| Posted: Thu Dec 22, 2011 12:10 pm Post subject: |
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What about the T52 sp1072?.
I thought the 2 versions were identical in response, but now I'm not exactly certain, and of course the faceplate is & mounting holes are different.
Can anyone comment as to whether the 105's can be modified to accept the sp1072's?
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ColinR
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| Posted: Thu Dec 22, 2011 12:26 pm Post subject: |
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Hint, hint, there are two Ref 105-2 crossover schematics on this site, one is for SP1049 the other is for the __________ (fill in blank space), with a rerun of the target function for the whole design.
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speakerguru
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Joined: 18 Nov 2005
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Location: Green Hut, Tovil
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| Posted: Thu Dec 22, 2011 5:26 pm Post subject: |
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| T.O. Chef wrote: | | I thought the 2 versions were identical in response, but now I'm not exactly certain...... |
SP1049, SP1072; The moving parts, alnico magnet and centre pole are identical. Only the outer magnet return path and top/mounting plate are different. Reasons for the change were elimination of costly deep forged pot and turned top plate, plus, compatability with T33 mounting plate. |
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T.O. Chef
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Joined: 31 Aug 2007
Posts: 187
Location: Toronto Canada
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| Posted: Fri Dec 23, 2011 2:13 am Post subject: |
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Well, I have 2 pairs of "Not Constructor Series" sp1072's sitting on my desk, 1 pair of which tests beautifully matched.
So I'll see if I can't help our new friend get up & running properly. Glad I saved them.
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m.elmslie
Introductory Contributor
Joined: 17 Dec 2011
Posts: 7
Location: FRASERBURGH
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| Posted: Thu Jan 12, 2012 2:51 pm Post subject: Thanks for the offer |
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Thanks to T.O.Chef for his kind offer but costs involved importing from canada just a wee bit to much for me at this present time.
Anyway thought i'd post a couple of pics of the 105's in their original condition as i was given them.Hopefully as work goes on i'll be able to add to the set.
http://www.flickr.com/photos/74103645@N05/sets/72157628830208307/ |
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audiolabtower
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| Posted: Thu Jan 12, 2012 7:28 pm Post subject: |
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Oh Dear! great original tweeter mod  |
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proffski
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Joined: 22 Aug 2003
Posts: 1297
Location: Tewkesbury UK
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| Posted: Thu Jan 12, 2012 10:54 pm Post subject: |
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| audiolabtower wrote: | | Oh Dear! great original tweeter mod |
Aargh, I hate seeing this sort of torture!
Paper cone tweeters... 
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m.elmslie
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Joined: 17 Dec 2011
Posts: 7
Location: FRASERBURGH
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| Posted: Fri Jan 13, 2012 11:47 am Post subject: |
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| You should have heard it ! |
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