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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: What idiot decided to cut a hole in these?
Nimo_jon

Replies: 5
Views: 576

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: 20
Views: 1197

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: 20
Views: 1197

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: 4878

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: 20
Views: 1197

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: 25139

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: 25139

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: 25139

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: 25139

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: 25139

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: 9252

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 ...
  Topic: KEF 104 to KEF 104aB mkII with SPICE
Nimo_jon

Replies: 8
Views: 9252

PostForum: KEF Speakers from the 1970s   Posted: Mon Aug 29, 2011 2:47 pm   Subject: KEF 104 to KEF 104aB mkII with SPICE
Hello Mulane,

How you doing? Thanks for reading. Yes the comparison was done with the modified 104. The 104 has moved on to a 104aB.

So now I have TWO pairs of KEF 104aB. Only one pair follows ...
  Topic: KEF Carlton III resurrection with Seas 22T/AF
Nimo_jon

Replies: 14
Views: 25139

PostForum: KEF speakers   Posted: Wed Jul 06, 2011 3:30 am   Subject: KEF Carlton III resurrection with Seas 22T/AF
Thank you Sir. You are right. Smile
  Topic: KEF Carlton III resurrection with Seas 22T/AF
Nimo_jon

Replies: 14
Views: 25139

PostForum: KEF speakers   Posted: Tue Jul 05, 2011 2:50 pm   Subject: KEF Carlton III resurrection with Seas 22T/AF
The KEF Carlton III (1983) speakers are now more than three decades old. After the long years, the T33 tweeters may suffer from performance degradation due to the thickening of the ferrofluid in the v ...
  Topic: KEF 104 to KEF 104aB mkII with SPICE
Nimo_jon

Replies: 8
Views: 9252

PostForum: KEF Speakers from the 1970s   Posted: Sat May 28, 2011 2:24 pm   Subject: KEF 104 to KEF 104aB mkII with SPICE
Hi mate,

The Mundorff 2.7mH really amazed me after a simple, short run in.

First of all, the mid range has a lot more details, with even more involving sweetness. I could hear my familiar record ...
 
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