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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 Celeste IV SP1145
speakerguru

Replies: 2
Views: 277

PostForum: KEF Speakers from the 1970s   Posted: Sun Dec 08, 2019 12:30 pm   Subject: Advice please on Celeste IV SP1145
The cloth is a sock and my initial recollection was that it was pulled tight by a drawstring at the bottom, hidden by the base. Early models had a wood/MDF base; later models had a moulded plastic bas ...
  Topic: KEF Ref 105.4 power cords?
speakerguru

Replies: 4
Views: 3216

PostForum: KEF speakers   Posted: Tue Dec 03, 2019 2:02 pm   Subject: Re: KEF Ref 105.4 power cords?
... when I was able to purchase high end power cords (AQ) - at a used price. The result was that the bass immediately cleared up....

Trying to summon up my wildest imagination, I still cannot conc ...
  Topic: Cross over SP2010A
speakerguru

Replies: 2
Views: 252

PostForum: KEF speakers   Posted: Thu Nov 14, 2019 4:56 pm   Subject: Cross over SP2010A
Looks plausible. Without taking mine apart, which I'm not inclined to do, I can't say with absolute certainty.

You could always try KEF Audio. I should think they have all the old KEF Electronics ...
  Topic: Can i Just say...
speakerguru

Replies: 5
Views: 377

PostForum: KEF speakers   Posted: Thu Nov 14, 2019 4:24 pm   Subject: Can i Just say...
I think that Guru knows more about the design than anyone??... Wink Smile

No. I did not do much work on that design. I was working on Kubes and the Professional Series at that time, I think.

Imagi ...
  Topic: Can i Just say...
speakerguru

Replies: 5
Views: 377

PostForum: KEF speakers   Posted: Fri Nov 08, 2019 4:19 pm   Subject: Re: Can i Just say...
I'm loving my 105.3 with valve amplification. Everywhere you see "you'll need 3Kw transistor amplification to drive them", nope 35W is plenty - and i'm not using anywhere near all of that.
...
  Topic: 104/2 low sound level
speakerguru

Replies: 4
Views: 1931

PostForum: KEF speakers   Posted: Sat Oct 26, 2019 5:09 pm   Subject: 104/2 low sound level
A capacitance meter might be the way to go, unsolder one end of each cap to measure. There are some resistors in the circuit, less likely than the caps but could be measured, the inductors should be t ...
  Topic: KEF 105.3 refoam and ferrofluid Cadmium washers?
speakerguru

Replies: 5
Views: 3614

PostForum: KEF speakers   Posted: Fri Sep 13, 2019 9:00 am   Subject: KEF 105.3 refoam and ferrofluid Cadmium washers?
Were they used to space the SP1240 to the correct position to maintain phase relationship?

Or was it simply fitted by mistake?

No. You can calculate one washer's worth of phase shift assuming th ...
  Topic: Cs7 with BD139 passive radiator for deeper bass?
speakerguru

Replies: 7
Views: 7536

PostForum: DIY with KEF drive units   Posted: Tue Aug 27, 2019 8:29 pm   Subject: Cs7 with BD139 passive radiator for deeper bass?
The Falcon B139 chassis dimensions are identical to the original later version KEF SP1044 with an extra 25mm chassis depth to allow for greater power handling ( now 150W), helped by the provision of a ...
  Topic: Cs7 with BD139 passive radiator for deeper bass?
speakerguru

Replies: 7
Views: 7536

PostForum: DIY with KEF drive units   Posted: Tue Aug 27, 2019 4:14 pm   Subject: Cs7 with BD139 passive radiator for deeper bass?
Please read http://www.hifiloudspeakers.info/speakertalk/viewtopic.php?t=652&highlight=transmission
It will save you wasting a lot of time on unnecessary cabinet work. If you do like woodwork the ...
  Topic: KEF 105.3 refoam and ferrofluid Cadmium washers?
speakerguru

Replies: 5
Views: 3614

PostForum: KEF speakers   Posted: Tue Aug 27, 2019 4:03 pm   Subject: KEF 105.3 refoam and ferrofluid Cadmium washers?
Sorry can't remember definitively but the words "zinc plate, chrome passivate" seem to be lurking in the back of my brain for all KEF metalwork of that era. Could that be it?
  Topic: Cs7 with BD139 passive radiator for deeper bass?
speakerguru

Replies: 7
Views: 7536

PostForum: DIY with KEF drive units   Posted: Sat Aug 24, 2019 3:45 pm   Subject: Cs7 with BD139 passive radiator for deeper bass?
... since you don't have a B139, it's much better to get the Falcon one, as it provides longer excursion and higher power handling...

Not true; see https://www.falconacoustics.co.uk/drive-units-1/f ...
  Topic: Phase of KEF 107/2 tweeters
speakerguru

Replies: 2
Views: 3126

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: 7535

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: 4815

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: 4815

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 ...
 
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