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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: Phase of KEF 107/2 tweeters
speakerguru

Replies: 2
Views: 536

PostForum: KEF speakers   Posted: Sat Jun 22, 2019 3:42 pm   Subject: Re: Phase of KEF 107/2 tweeters
"The brown color is always the positive when paring(sic) with blue color"
Brown is LIVE and blue is NEUTRAL for ac mains in the EU but none of that has any bearing on KEF speaker wiring co ...
  Topic: KEF 105.1 Refurbishment
speakerguru

Replies: 12
Views: 1706

PostForum: KEF Speakers from the 1970s   Posted: Sun Dec 30, 2018 3:57 pm   Subject: Re: KEF 105.1 Refurbishment
*Somehow I cant attach the pics even when using I think that may be because the url you used is a secure https one and pix.sfly.com requires you to login before releasing the image.

Nice job on th ...
  Topic: Kef b200g sp1075
speakerguru

Replies: 7
Views: 1493

PostForum: KEF speakers   Posted: Wed Dec 19, 2018 4:22 pm   Subject: Kef b200g sp1075
A very gentle wipe with a damp cloth should be OK.
  Topic: Kef b200g sp1075
speakerguru

Replies: 7
Views: 1493

PostForum: KEF speakers   Posted: Wed Dec 05, 2018 9:50 am   Subject: Kef b200g sp1075
...One more thing what pva should i use? What should I buy - henkel moment wood waterproof or regular one or some cheap one, and should I dilute it with water?
see http://www.hifiloudspeakers.info/s ...
  Topic: Kef b200g sp1075
speakerguru

Replies: 7
Views: 1493

PostForum: KEF speakers   Posted: Tue Dec 04, 2018 10:03 am   Subject: Kef b200g sp1075
I see. Something must have gone wrong when the chassis was attached to the magnet assembly. Normally the action of staking the semi shear pins on the top plate (of the magnet) forces the chassis down ...
  Topic: Kef b200g sp1075
speakerguru

Replies: 7
Views: 1493

PostForum: KEF speakers   Posted: Mon Dec 03, 2018 10:18 am   Subject: Re: Kef b200g sp1075
.... I saw that magnet on one b200g Is little separated from the basket 1mm and someone put a part of toothpick to get it not to move....

Welcome to the forum. Could you post a photo?
  Topic: KEF 105 vs 105/2
speakerguru

Replies: 43
Views: 5497

PostForum: KEF Speakers from the 1970s   Posted: Sat Nov 03, 2018 5:37 pm   Subject: KEF 105 vs 105/2
I assumed the 30uF was part of the aB circuit, only used with the 0.22uF and 3.3/7uF combination. There are certainly designed spaces for these components on the pcb at C9 and C11 (0.22), unpopulated ...
  Topic: KEF 105 vs 105/2
speakerguru

Replies: 43
Views: 5497

PostForum: KEF Speakers from the 1970s   Posted: Sat Nov 03, 2018 5:22 pm   Subject: KEF 105 vs 105/2
A few pictures here showing the filters "as found".

Note the etched trace on the left side. I have not attempted to decipher that revision, but everything seems to function as it should, ...
  Topic: KEF 105 vs 105/2
speakerguru

Replies: 43
Views: 5497

PostForum: KEF Speakers from the 1970s   Posted: Sat Nov 03, 2018 12:11 pm   Subject: KEF 105 vs 105/2
That said, the etching of the SP1100 board in one spot shrieks of modification, as does the seemingly amateurish jumper wire from input to HF section (right after the Tank Circuit). I have not seen a ...
  Topic: KEF 105 vs 105/2
speakerguru

Replies: 43
Views: 5497

PostForum: KEF Speakers from the 1970s   Posted: Fri Nov 02, 2018 11:20 pm   Subject: KEF 105 vs 105/2

This circuit has been either wrongly traced or wrongly drawn. There is no way any KEF tweeter crossovers would have had a 5.5kHz trap in the input to the tweeter part of the crossover.

It's poss ...
  Topic: KEF 105 vs 105/2
speakerguru

Replies: 43
Views: 5497

PostForum: KEF Speakers from the 1970s   Posted: Thu Nov 01, 2018 10:45 pm   Subject: KEF 105 vs 105/2
The 30uF is shown in a circuit diagram here,
Link, please?

All I can find is this http://www.hifiloudspeakers.info/Anatomy/Crossovers/105.2/105.2CrossoverIndex.html
which shows a series LC NOT a ...
  Topic: KEF 105 vs 105/2
speakerguru

Replies: 43
Views: 5497

PostForum: KEF Speakers from the 1970s   Posted: Thu Nov 01, 2018 5:55 pm   Subject: Re: KEF 105 vs 105/2
...On the HF section There's a 30uF cap in parallel with a .028Mh coil on the input....

Are you sure about this? 30uF in parallel with 28uH resonates at ~5.5kHz. I don't recall any KEF designs usin ...
  Topic: Kefkit-ish - Scrap, improve or replace
speakerguru

Replies: 4
Views: 1054

PostForum: DIY with KEF drive units   Posted: Thu Nov 01, 2018 5:37 pm   Subject: Re: Kefkit-ish - Scrap, improve or replace
...an infinite baffle floorstander of approx 46L with a B139 saved from an ancient K2 Celeste, a B110 of unknown provenance and a Scanspeak D2010 tweeter......an actual Kef DN12....

46 ltr is in th ...
  Topic: Advice please on 105-II recap
speakerguru

Replies: 17
Views: 2956

PostForum: KEF Speakers from the 1970s   Posted: Sat Oct 20, 2018 3:45 pm   Subject: Advice please on 105-II recap
Something is either very wrong with the crossover...design itself, ..

Well, that's not very likely, is it? Something has broken or changed after all these years and it is not as designed.

Why n ...
  Topic: 105/3 -B160(SP1257)- Adhesive recommendation/repair advice?
speakerguru

Replies: 5
Views: 1309

PostForum: KEF speakers   Posted: Fri Oct 12, 2018 1:35 pm   Subject: 105/3 -B160(SP1257)- Adhesive recommendation/repair advice?
Glad you managed to effect a repair. Very Happy
 
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