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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: Advice please on 105-II recap
habrune

Replies: 17
Views: 854

PostForum: KEF Speakers from the 1970s   Posted: Sat Oct 06, 2018 8:29 am   Subject: Advice please on 105-II recap
Yes that is inaudible. My experience is that differences of about 1 or 2 dB are in an absolute sense inaudible and neglectible, but when tuning e.g. a tweeter to midrange level small differences of 0. ...
  Topic: Advice please on 105-II recap
habrune

Replies: 17
Views: 854

PostForum: KEF Speakers from the 1970s   Posted: Thu Oct 04, 2018 9:54 pm   Subject: Advice please on 105-II recap
That's great engineering! I love these details, thanks! So, I expect the voltage sensor is high impedance. Further, if it senses mean RMS, it won't bother about EMK spikes supposedly generated bij the ...
  Topic: Advice please on 105-II recap
habrune

Replies: 17
Views: 854

PostForum: KEF Speakers from the 1970s   Posted: Mon Oct 01, 2018 11:07 pm   Subject: Advice please on 105-II recap
I disconnected the S-stop circuitry totally (diconnecting the 6-strand lead from the inside of the connector on the head, black-blue-red-yellow-white-lightblue). I also bypassed the relay connections. ...
  Topic: Advice please on 105-II recap
habrune

Replies: 17
Views: 854

PostForum: KEF Speakers from the 1970s   Posted: Mon Oct 01, 2018 12:52 pm   Subject: Advice please on 105-II recap
Speakerguru, thanks. In that line of thought one could remove the 47R to increase output but I fear the 47R is also there to dampen resonance between the caps and the voicecoil inductance (as does the ...
  Topic: Advice please on 105-II recap
habrune

Replies: 17
Views: 854

PostForum: KEF Speakers from the 1970s   Posted: Mon Oct 01, 2018 11:03 am   Subject: Advice please on 105-II recap
Audiolabtower, thanks for the reply. LED's are functioning well and I aligned the heads. Marvelous stereo image. The T52 have only the R3 = 47 Ohm as 'zobel', C12 is a short.
In my CS9's I had exchan ...
  Topic: Advice please on 105-II recap
habrune

Replies: 17
Views: 854

PostForum: KEF Speakers from the 1970s   Posted: Sat Sep 29, 2018 10:47 pm   Subject: Advice please on 105-II recap
An acquaintace asked me to recap a pair of 105-II's Early serial no. 1113. I measured all the caps and all of them about 10% larger than nominal. Quite normal as I learned from very usefull informatio ...
  Topic: Rebuild 105 from CS9
habrune

Replies: 12
Views: 486

PostForum: KEF Speakers from the 1970s   Posted: Mon Sep 10, 2018 1:42 pm   Subject: Rebuild 105 from CS9
Thanks Speakerguru. That ring is still in place, pff...(sweat..)
  Topic: Rebuild 105 from CS9
habrune

Replies: 12
Views: 486

PostForum: KEF Speakers from the 1970s   Posted: Sun Sep 09, 2018 1:42 pm   Subject: Rebuild 105 from CS9
That is a reassuring reply, much appreceated, and thanks for the values, a help in the sense that tuned values are not that far off so that the Falcon kit will do.
Thanks for this illuminating thread ...
  Topic: Rebuild 105 from CS9
habrune

Replies: 12
Views: 486

PostForum: KEF Speakers from the 1970s   Posted: Sun Sep 09, 2018 7:52 am   Subject: Rebuild 105 from CS9
Audiolabtower, I have to apopogize because I see that you adressed in other posts your 105 recap issue etc. in detail. Didn't do my homework properly, sorry.
One question remains: you mentioned the ...
  Topic: Rebuild 105 from CS9
habrune

Replies: 12
Views: 486

PostForum: KEF Speakers from the 1970s   Posted: Sat Sep 08, 2018 2:17 pm   Subject: Rebuild 105 from CS9
Audiolabtower and Speakerguru: Very pleased by your very informative answers. Thank you, really great to hear the information that is hard to get.

Am I correct to conclude that the bottom line is w ...
  Topic: Rebuild 105 from CS9
habrune

Replies: 12
Views: 486

PostForum: KEF Speakers from the 1970s   Posted: Thu Sep 06, 2018 11:11 pm   Subject: Rebuild 105 from CS9
Yes, thank you for the link, I am aware of the admirable KEF matching procedure and the Falcon offerings (I recapped 103's, 104's and cantata's). Did you measure 3.526/3.556 at the time when the 105-I ...
  Topic: Rebuild 105 from CS9
habrune

Replies: 12
Views: 486

PostForum: KEF Speakers from the 1970s   Posted: Thu Sep 06, 2018 6:45 pm   Subject: Rebuild 105 from CS9
Audiolabtower, thanks for your realistic answer. I get from it that the deviation between actual values needed for these specific individual drivers to achieve optimal performance and the specced valu ...
  Topic: Rebuild 105 from CS9
habrune

Replies: 12
Views: 486

PostForum: KEF Speakers from the 1970s   Posted: Tue Sep 04, 2018 6:52 pm   Subject: Rebuild 105 from CS9
I managed to acquire a very cheap pair of CS9 kit cabinets. Very small dent in one T52, tiny spot on one B110B with coating loss, both with no impact on sound and soundstage. And rubbing B300's. Afte ...
  Topic: KEF KIT3 Servicing
habrune

Replies: 16
Views: 16876

PostForum: KEF Speakers from the 1970s   Posted: Wed May 06, 2015 12:49 pm   Subject: KEF KIT3 Servicing
Thanks for the warning! Wow, nearly solid mercury....
  Topic: KEF KIT3 Servicing
habrune

Replies: 16
Views: 16876

PostForum: KEF Speakers from the 1970s   Posted: Sun May 03, 2015 11:05 am   Subject: KEF KIT3 Servicing
Thank you all very much for the variety of tips. I'll try on some remote parts of the rim first (having been warned loud & clear). Dot 4 brake fluid is at hand, as I'm changing the brake leads of ...
 
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