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This forum has been set up to facilitate discussion of 1970s KEF speakers and drive units. The owner of the Forum has no connection with KEF Audio.
 
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  Topic: KEF 104aB rebuild with MiniDSP and Dayton drivers
Nimo_jon

Replies: 4
Views: 790

PostForum: KEF Speakers from the 1970s   Posted: Tue Sep 18, 2018 10:32 am   Subject: KEF 104aB rebuild with MiniDSP and Dayton drivers
Hi, thanks indeed there were a lot of work.

Repeated filler application, sanding down, and refill again. Replacing the baffle was not considered because it is very difficult to do the cut out for ...
  Topic: KEF 104aB rebuild with MiniDSP and Dayton drivers
Nimo_jon

Replies: 4
Views: 790

PostForum: KEF Speakers from the 1970s   Posted: Sun Sep 16, 2018 7:58 am   Subject: KEF 104aB rebuild with MiniDSP and Dayton drivers
Wow. Lots and Lots of work.
But like they say .... It's not so much the destination as the journey.
The cab's sure look great!

Thanks Chef! This project dragged a number of years. Recently there ...
  Topic: Colin Royle
Nimo_jon

Replies: 21
Views: 35695

PostForum: Obituaries, Tributes and Memories    Posted: Mon Sep 10, 2018 3:36 pm   Subject: Colin Royle
Tribute to the great man. Sad
  Topic: KEF 104aB rebuild with MiniDSP and Dayton drivers
Nimo_jon

Replies: 4
Views: 790

PostForum: KEF Speakers from the 1970s   Posted: Mon Sep 10, 2018 3:33 pm   Subject: KEF 104aB rebuild with MiniDSP and Dayton drivers
KEF 104aB rebuild with MiniDSP and Dayton drivers

In 2011 I rebuilt a very old pair of KEF104 into KEF104ab using premium coils and caps (see my old post http://i154.photobucket.com/albums/s263/ni ...
  Topic: What idiot decided to cut a hole in these?
Nimo_jon

Replies: 5
Views: 1523

PostForum: KEF Speakers from the 1970s   Posted: Mon Jul 30, 2018 7:11 am   Subject: What idiot decided to cut a hole in these?
GBP 1800. Wow.
  Topic: 105.2 clone with T33 tweeters?
Nimo_jon

Replies: 21
Views: 4759

PostForum: DIY with KEF drive units   Posted: Wed Jul 11, 2018 1:20 am   Subject: 105.2 clone with T33 tweeters?
Yes, the ferrofluid is meant for the T33 I am fixing, not for the T27.

The B300 is to be replaced by the Peerless 12in. I am driving it with a 200W class D amp.

Intrigued to read you are adding ...
  Topic: 105.2 clone with T33 tweeters?
Nimo_jon

Replies: 21
Views: 4759

PostForum: DIY with KEF drive units   Posted: Tue Jul 10, 2018 10:41 am   Subject: 105.2 clone with T33 tweeters?
Hello Sasi,

Thanks and nice to read your sharing. You are too right to say that the passive components L and C can add up to the cost of a decent amplifier, and provide little flexibility for tunin ...
  Topic: kef 105.2 Bass cabinet's Internal Volume
Nimo_jon

Replies: 9
Views: 5799

PostForum: KEF Speakers from the 1970s   Posted: Mon Jun 25, 2018 3:11 am   Subject: kef 105.2 Bass cabinet's Internal Volume
KEF 105.2 dimensions

Thanks for the insight of the internal dimensions. I am rebuilding a KEF base cabinet using MDF (now in Singapore).

The external dimensions are top 330mm Base 415mm height 6 ...
  Topic: 105.2 clone with T33 tweeters?
Nimo_jon

Replies: 21
Views: 4759

PostForum: DIY with KEF drive units   Posted: Fri Jun 22, 2018 1:51 am   Subject: 105.2 clone with T33 tweeters?
Hi eschenborn

Wonder how has your project progressed. I am doing a very similar exercise now. I miss my KEF 105.2 after the tweeters died 20 years ago (I sold the pair away ). I have gatherrf a lot ...
  Topic: KEF Carlton III resurrection with Seas 22T/AF
Nimo_jon

Replies: 14
Views: 27642

PostForum: KEF speakers   Posted: Fri Sep 02, 2011 1:18 am   Subject: KEF Carlton III resurrection with Seas 22T/AF
Yes, the cap will tame the T27.
However, 0,6u is not the value, you should use 0.33uf.
0.33uf interacts with the L, C, values here to give the desired effect.

Sometimes KEF adds a 220ohms in ser ...
  Topic: KEF Carlton III resurrection with Seas 22T/AF
Nimo_jon

Replies: 14
Views: 27642

PostForum: KEF speakers   Posted: Thu Sep 01, 2011 1:44 am   Subject: KEF Carlton III resurrection with Seas 22T/AF
Hi there,

1. the first simulation you did which showed a miss-match between the B110/T27 - was this done with the ETI crossover with 6uF/0.4mH/5ohm/12ohm?

Yes, that was done using the circuit di ...
  Topic: KEF Carlton III resurrection with Seas 22T/AF
Nimo_jon

Replies: 14
Views: 27642

PostForum: KEF speakers   Posted: Wed Aug 31, 2011 5:17 pm   Subject: KEF Carlton III resurrection with Seas 22T/AF
Hello Mulane

I looked at the circuit you provided and compared with the Atkinson design. There are some discrepancies. In the original design, there are a total of 4 tweeters : 2 Celestions , 1 Kef ...
  Topic: KEF Carlton III resurrection with Seas 22T/AF
Nimo_jon

Replies: 14
Views: 27642

PostForum: KEF speakers   Posted: Tue Aug 30, 2011 11:34 am   Subject: KEF Carlton III resurrection with Seas 22T/AF
Hi there

R73 and R66 are the sensitivity compensation network to bring the 22TAF down from 93dB to 88dB (as the original tweeter).

There are two types of attenuation: series resistance and vol ...
  Topic: KEF Carlton III resurrection with Seas 22T/AF
Nimo_jon

Replies: 14
Views: 27642

PostForum: KEF speakers   Posted: Tue Aug 30, 2011 12:44 am   Subject: KEF Carlton III resurrection with Seas 22T/AF
Another very interesting thread Nimo_jon. What progress have you made with the Seas in the 104aB?

Very interested in the circuit you come up with as I also use T27s in my transmission lines and if ...
  Topic: KEF 104 to KEF 104aB mkII with SPICE
Nimo_jon

Replies: 8
Views: 10267

PostForum: KEF Speakers from the 1970s   Posted: Mon Aug 29, 2011 4:37 pm   Subject: KEF 104 to KEF 104aB mkII with SPICE
The Mundorf sounds more fluid (after breaking in) than the Carli Mylars.
I would say the Carli sounds in between the Mundorf and the Alcap.

As for T27a replacement, I found something better, read ...
 
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