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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
audiolabtower

Replies: 4
Views: 109

PostForum: KEF Speakers from the 1970s   Posted: Sun Sep 16, 2018 3:55 pm   Subject: KEF 104aB rebuild with MiniDSP and Dayton drivers
Wow again, to rebuild the cutouts clean from that bad wood, what a job! Were you not tempted to replace the baffles, maybe put the drivers down a centre line?
  Topic: KEF 105 vs 105/2
audiolabtower

Replies: 7
Views: 107

PostForum: KEF Speakers from the 1970s   Posted: Fri Sep 14, 2018 8:47 pm   Subject: KEF 105 vs 105/2
The zobel cap value will not be ultra sensitive and 5% will be fine. Also since the network is in parallel with the inductance of the drive unit it does not matter which way round the cap or resistor ...
  Topic: KEF 105 vs 105/2
audiolabtower

Replies: 7
Views: 107

PostForum: KEF Speakers from the 1970s   Posted: Fri Sep 14, 2018 1:25 pm   Subject: KEF 105 vs 105/2
Intentional, yes because a 12in unit in a 70 litre box can't give you below 20Hz at any significant power level compared to the design efficiency, so impedance should be high. I assume this impedance ...
  Topic: KEF 105 vs 105/2
audiolabtower

Replies: 7
Views: 107

PostForum: KEF Speakers from the 1970s   Posted: Thu Sep 13, 2018 2:20 pm   Subject: KEF 105 vs 105/2
Your hf section looks like the aB version which some T52s required, presumably if the resonant freq was high Q and closer to crossover freq? Many T52s did not need it. I assume the 30uF is in C9 and t ...
  Topic: Rebuild 105 from CS9
audiolabtower

Replies: 12
Views: 153

PostForum: KEF Speakers from the 1970s   Posted: Sun Sep 09, 2018 12:43 pm   Subject: Rebuild 105 from CS9
Hi, look at it this way, only Kef and Spendor went to the expense of selecting crossover components, or at least not many others claimed to do so, except for the hand calibrated samples specially buil ...
  Topic: Rebuild 105 from CS9
audiolabtower

Replies: 12
Views: 153

PostForum: KEF Speakers from the 1970s   Posted: Thu Sep 06, 2018 11:37 pm   Subject: Rebuild 105 from CS9
Measured about 5 years old so drift not an issue, besides it would have been remarkable if drift had been so consistent between 2 different samples. Crossovers now external to cabinets in a wooden box ...
  Topic: Rebuild 105 from CS9
audiolabtower

Replies: 12
Views: 153

PostForum: KEF Speakers from the 1970s   Posted: Thu Sep 06, 2018 7:13 pm   Subject: Rebuild 105 from CS9
Kef bought in their caps and sorted them into 1% bands for the Reference series, measured and paired the drive units and wound inductors to suit based on what the computer calculated for best match mi ...
  Topic: Rebuild 105 from CS9
audiolabtower

Replies: 12
Views: 153

PostForum: KEF Speakers from the 1970s   Posted: Wed Sep 05, 2018 9:45 pm   Subject: Rebuild 105 from CS9
Guru will know the best but 105 II ran from 1979 to 1987, while CS9 ran from 1981 to 1990, so it is likely the drive units were those left over from the reference series closer tolerance pairing selec ...
  Topic: Kef 105/4 crossover recap
audiolabtower

Replies: 4
Views: 242

PostForum: KEF speakers   Posted: Fri Jul 20, 2018 6:51 pm   Subject: Kef 105/4 crossover recap
Low Loss electrolytics are used in places where high internal resistance may be troublesome. Very generally speaking used for high crossovers around 3kHz where the ear is very sensitive or series caps ...
  Topic: 105.2 clone with T33 tweeters?
audiolabtower

Replies: 20
Views: 1386

PostForum: DIY with KEF drive units   Posted: Mon Jul 16, 2018 9:13 pm   Subject: 105.2 clone with T33 tweeters?
That is the one Fincham or Linkwitz has no knowledge of, thus not a Kef design and most probably sent in by an owner or third party.
  Topic: Can someone ID these KEF AWA speakers?
audiolabtower

Replies: 3
Views: 148

PostForum: KEF speakers   Posted: Mon Jul 16, 2018 2:44 pm   Subject: Can someone ID these KEF AWA speakers?
Sorry, I'm in the UK and would not have any idea of the market in NZ, if that is where you are. Obviously non original tweeters will affect things.
  Topic: Can someone ID these KEF AWA speakers?
audiolabtower

Replies: 3
Views: 148

PostForum: KEF speakers   Posted: Sun Jul 15, 2018 12:16 pm   Subject: Can someone ID these KEF AWA speakers?
They look like Calindas, if the bass unit has no voice coil and a passive radiator, and the tweeter cut out is certainly for a T27.

http://uk.kef.com/explore-kef/kef-museum/1970s/corelli-calinda-an ...
  Topic: 105.2 clone with T33 tweeters?
audiolabtower

Replies: 20
Views: 1386

PostForum: DIY with KEF drive units   Posted: Tue Jul 10, 2018 10:12 pm   Subject: 105.2 clone with T33 tweeters?
I investigated that active crossover and got in touch with Laurie Fincham at THX and Siegfried Linkwitz who did the Wireless World active design with his 4th order crossovers and neither could remembe ...
  Topic: 105.2 clone with T33 tweeters?
audiolabtower

Replies: 20
Views: 1386

PostForum: DIY with KEF drive units   Posted: Tue Jul 10, 2018 12:45 pm   Subject: 105.2 clone with T33 tweeters?
rather small ferrite coils.

For info Kef used iron dust rather than the cheaper ferrites in the reference series because had much superior saturation performance as well as lower low level distorti ...
  Topic: KEF 104/2 - restoring, surrounds, ferro fluid and caps
audiolabtower

Replies: 14
Views: 628

PostForum: KEF speakers   Posted: Wed Jun 13, 2018 11:31 am   Subject: KEF 104/2 - restoring, surrounds, ferro fluid and caps
Perhaps a surplus of viscosity makes the coil more difficult to move and thus reduces sensitivity to produce a less bright sound?
 
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