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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 104/2 - restoring, surrounds, ferro fluid and caps
audiolabtower

Replies: 14
Views: 141

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?
  Topic: What idiot decided to cut a hole in these?
audiolabtower

Replies: 4
Views: 163

PostForum: KEF Speakers from the 1970s   Posted: Sun May 27, 2018 1:30 pm   Subject: What idiot decided to cut a hole in these?
I did wonder if they left the series cap in the bass circuit too!
  Topic: What idiot decided to cut a hole in these?
audiolabtower

Replies: 4
Views: 163

PostForum: KEF Speakers from the 1970s   Posted: Sat May 26, 2018 7:08 pm   Subject: What idiot decided to cut a hole in these?
Wink
  Topic: What idiot decided to cut a hole in these?
audiolabtower

Replies: 4
Views: 163

PostForum: KEF Speakers from the 1970s   Posted: Fri May 25, 2018 8:32 pm   Subject: What idiot decided to cut a hole in these?
https://www.ebay.co.uk/itm/kef-floor-standing-speakers-model-105-and-full-technics-music-system/132626012320?hash=item1ee12058a0:g:vp0AAOSwlgNa~KOF

eBay item number:132626012320
  Topic: Bringing the 105.2 back to life
audiolabtower

Replies: 10
Views: 5064

PostForum: KEF Speakers from the 1970s   Posted: Wed May 16, 2018 12:48 pm   Subject: Bringing the 105.2 back to life
Good story, well worth doing. In their day they were one of the finest speakers you could buy, and even today unless you need 110 dB to go deaf quickly they are still one of the best ever.
  Topic: 103/4 - B160 SP1278 Swap w/ B160 SP1314
audiolabtower

Replies: 8
Views: 463

PostForum: KEF speakers   Posted: Thu May 10, 2018 11:32 pm   Subject: 103/4 - B160 SP1278 Swap w/ B160 SP1314
What a great story, and a fine way to restore a speaker the original designers and makers spent a great deal of effort on.
  Topic: 105.2 clone with T33 tweeters?
audiolabtower

Replies: 10
Views: 846

PostForum: DIY with KEF drive units   Posted: Sat Mar 03, 2018 1:03 pm   Subject: 105.2 clone with T33 tweeters?
There's no way you could put a B300 in a 105.4 bass section because it was designed for two B200s (in parallel perhaps?), but with one certainly rolled off before the other for a single unit ranged i ...
  Topic: 105.2 clone with T33 tweeters?
audiolabtower

Replies: 10
Views: 846

PostForum: DIY with KEF drive units   Posted: Tue Feb 27, 2018 7:09 pm   Subject: 105.2 clone with T33 tweeters?
Air core would be very much more resistance and probably diverge from the design if substituted just on values alone. Kef used iron dust core ferrites in the reference series which had lower distortio ...
  Topic: 105.2 clone with T33 tweeters?
audiolabtower

Replies: 10
Views: 846

PostForum: DIY with KEF drive units   Posted: Mon Feb 26, 2018 9:45 pm   Subject: 105.2 clone with T33 tweeters?
Falcon do kits for the 105 crossovers replacing the alcaps. If they can supply the coil values too you would be well on the way. I replaced all my caps years ago but if you went for alcaps now they sh ...
  Topic: Tangent TM1 revival
audiolabtower

Replies: 2
Views: 3337

PostForum: Other speakers   Posted: Thu May 25, 2017 5:21 pm   Subject: Tangent TM1 revival
Personally I think that square reflex tube was purely a gimmick. It must lead to "chuffing" and non linear behaviour under high output - just read the research done recently on port design e ...
  Topic: Reference 101 S Stop circuitry fault
audiolabtower

Replies: 11
Views: 1352

PostForum: KEF speakers   Posted: Mon May 08, 2017 3:33 pm   Subject: Reference 101 S Stop circuitry fault
I'm not sure if SpeakerGuru actually designed these speakers, so he should know Smile but from memory it has 2 large inductors and 1 small inductor in the crossover which are wound on iron dust cores, ...
  Topic: Reference 101 S Stop circuitry fault
audiolabtower

Replies: 11
Views: 1352

PostForum: KEF speakers   Posted: Thu May 04, 2017 12:39 pm   Subject: Reference 101 S Stop circuitry fault
Unfortunately the Falcon B110 is a SP1003 replacement, not the SP1057 which was used in the 101. The 1057 had twice as much power handling and a smoother response. In the event of no spares the only r ...
  Topic: 105.1 tweeter mounting hardware
audiolabtower

Replies: 8
Views: 1309

PostForum: KEF Speakers from the 1970s   Posted: Fri Apr 28, 2017 11:24 am   Subject: 105.1 tweeter mounting hardware
From memory the edges were rougher than MDF which is usually quite smooth and solid? Maybe they were still flooring grade chipboard so used the grip nuts? Or an early rougher type of MDF? The B300 baf ...
  Topic: Kef 105.2 Crossover / Head Assembly wiring HELP!
audiolabtower

Replies: 25
Views: 3888

PostForum: KEF speakers   Posted: Thu Apr 20, 2017 10:47 am   Subject: Kef 105.2 Crossover / Head Assembly wiring HELP!
Yes the switch is on the pcb, so it sits behind the power select knob.
  Topic: KEFKIT1 SP1045 kit
audiolabtower

Replies: 2
Views: 816

PostForum: DIY with KEF drive units   Posted: Tue Apr 18, 2017 12:13 pm   Subject: KEFKIT1 SP1045 kit
Wow, a regency Chorale! I understand Chippendale was the first to used bextrene cones when perfecting his rococo carvings and elaborate fretwork Very Happy
 
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