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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 C55 tweeter revival
Thierry

Replies: 13
Views: 5887

PostForum: KEF speakers   Posted: Sat Nov 14, 2015 10:13 am   Subject: KEF C55 tweeter revival
Hi,

Maybe before you give up you could try to have your tweeter repaired ?

http://www.wembleyloudspeaker.com/

Good luck.

Thierry
  Topic: Meridian M3
Thierry

Replies: 4
Views: 12873

PostForum: Linn Kan, Isobarik and others   Posted: Thu Oct 23, 2014 10:44 am   Subject: Re: Meridian M3
Gosh, a 1979 design! I have a test report on the M30 which is nothing like the M3. I'll keep looking in my library but please do not hold your breath... Smile There is a tiny bit of info below.

ht ...
  Topic: B200 SP1070 to replace B200 SP1076?
Thierry

Replies: 37
Views: 14331

PostForum: KEF speakers   Posted: Wed Oct 22, 2014 5:01 am   Subject: B200 SP1070 to replace B200 SP1076?
what is PVA damping?

Some reading : http://en.wikipedia.org/wiki/Polyvinyl_acetate

I call it wood glue.

Thierry
  Topic: Amp for 105.2
Thierry

Replies: 24
Views: 15761

PostForum: KEF Speakers from the 1970s   Posted: Tue Nov 26, 2013 3:18 pm   Subject: Amp for 105.2
De-magnetizing a ferrite magnet probably takes a fair amount of heat built in the unit (which I assume was likely to happen in the KM1, given the system goals). This is largely preferable over the old ...
  Topic: Amp for 105.2
Thierry

Replies: 24
Views: 15761

PostForum: KEF Speakers from the 1970s   Posted: Tue Nov 26, 2013 11:45 am   Subject: Amp for 105.2

Yes that's correct. The only thing that I can think of which would dull the sound would be if the bond between voice coil and diaphragm was failing or the magnet had become partially de-magnestised. ...
  Topic: Amp for 105.2
Thierry

Replies: 24
Views: 15761

PostForum: KEF Speakers from the 1970s   Posted: Mon Nov 25, 2013 1:46 pm   Subject: Amp for 105.2
I worked on T52s quite a bit when developing the KM1 version.

The KM1 is one of the best loudspeaker system (if not the best) I have ever listened to in my life and the closest thing to real life m ...
  Topic: Amp for 105.2
Thierry

Replies: 24
Views: 15761

PostForum: KEF Speakers from the 1970s   Posted: Tue Oct 22, 2013 9:18 am   Subject: Amp for 105.2
In my humble opinion the Quad 606 (MkI or MkII) is a very good choice.
I also used a Quad 405 and an two home made Quad hybrids using the Quad 405 boards and a swicthing mode power supply.
All of ...
  Topic: Amp for 105.2
Thierry

Replies: 24
Views: 15761

PostForum: KEF Speakers from the 1970s   Posted: Sun Oct 20, 2013 4:08 pm   Subject: Amp for 105.2
In my humble opinion the Quad 606 (MkI or MkII) is a very good choice.
I also used a Quad 405 and an two home made Quad hybrids using the Quad 405 boards and a swicthing mode power supply.
All of ...
  Topic: 105/2 refurbishment.
Thierry

Replies: 4
Views: 2652

PostForum: KEF Speakers from the 1970s   Posted: Fri Aug 23, 2013 5:48 am   Subject: 105/2 refurbishment.
Hello,

Glad to see the good work going on.

One very important thing once you are finished with the bass cabinet and woofers are refitted is to check it is absolutely airtight : push the cones b ...
  Topic: KEF 101
Thierry

Replies: 8
Views: 3853

PostForum: KEF Speakers from the 1970s   Posted: Mon Jun 24, 2013 8:44 am   Subject: KEF 101
The only time I had to replace a capacitor in a passive crossover was when it blew into pieces because of a massive power surge. Speakers were B&W D5s (wonderful little speakers) connected to a 20 ...
  Topic: KEF 105 question
Thierry

Replies: 19
Views: 8995

PostForum: KEF Speakers from the 1970s   Posted: Thu Mar 21, 2013 9:17 am   Subject: Re: KEF 105 question
I'm new to all this but have just got hold of a pair of vintage KEF 105's which I haven't been able to listen to yet. I'm still looking for an amplifier which will do them justice. I had been thinking ...
  Topic: New to vintage speakers
Thierry

Replies: 21
Views: 14941

PostForum: KEF Speakers from the 1970s   Posted: Mon Feb 18, 2013 1:30 pm   Subject: New to vintage speakers
Today i found the courage to replace the socket holders. As the caps of the original were missing and just coulnd find new ones. I bought 2 new socket holders and replaced them, easy fix. Though by op ...
  Topic: 105.1 led circuit
Thierry

Replies: 31
Views: 11824

PostForum: KEF Speakers from the 1970s   Posted: Sat Jan 05, 2013 9:26 am   Subject: 105.1 led circuit
Thanks for the help. The only thing I couldn't see was anything on the diodes. I guess that a standard 1N901 is not safe for 200W output swings so maybe they are 200V diodes to be safe?

200W on a 8 ...
  Topic: 105.1 led circuit
Thierry

Replies: 31
Views: 11824

PostForum: KEF Speakers from the 1970s   Posted: Wed Dec 12, 2012 6:54 am   Subject: 105.1 led circuit
Remind me what were the switch position markings? Apart from the clipping indicator at different power levels and the "listening window" position, what else was there?

Maybe you have in m ...
  Topic: KEF 105 Project Nearly Complete...
Thierry

Replies: 12
Views: 4350

PostForum: KEF Speakers from the 1970s   Posted: Mon Nov 19, 2012 4:27 pm   Subject: KEF 105 Project Nearly Complete...
If the bass cabinets are up to the perfection you achieved with the heads, your 105s will definitely look spanking new !

It is always comforting to see beautiful loudspeakers like the 105 being pam ...
 
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