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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 105.1 Refurbishment
audiolabtower

Replies: 7
Views: 165

PostForum: KEF Speakers from the 1970s   Posted: Thu Nov 29, 2018 6:11 pm   Subject: KEF 105.1 Refurbishment
Excellent.
  Topic: KEF 105.1 Refurbishment
audiolabtower

Replies: 7
Views: 165

PostForum: KEF Speakers from the 1970s   Posted: Thu Nov 29, 2018 5:15 pm   Subject: KEF 105.1 Refurbishment
Try 12in gaskets, or more easily I guess those windows sealing strips with the close cell foam.
  Topic: KEF 105.1 Refurbishment
audiolabtower

Replies: 7
Views: 165

PostForum: KEF Speakers from the 1970s   Posted: Wed Nov 28, 2018 11:59 pm   Subject: KEF 105.1 Refurbishment
That might explain any bass difference? Check the baffle sealing foam strip, B300 sealing gasket, internal edges, speaker cable tube glueing, binding post mounting tightness etc etc?
  Topic: KEF 105.1 Refurbishment
audiolabtower

Replies: 7
Views: 165

PostForum: KEF Speakers from the 1970s   Posted: Wed Nov 28, 2018 3:37 pm   Subject: KEF 105.1 Refurbishment
Excellent looking job, always nice to see classic speakers of that age looking good as new. Are the bass cabinets well sealed? Unpowered, pushing the coil of the B300 in gently by hand they should tak ...
  Topic: KEF 105 vs 105/2
audiolabtower

Replies: 43
Views: 1400

PostForum: KEF Speakers from the 1970s   Posted: Sun Nov 04, 2018 3:28 pm   Subject: KEF 105 vs 105/2
Yes my boards are most certainly screen printed as SP1100. I have seen pictures of that screw back head arrangement but never seen one. I did find a picture of a crossover "kit" which is sim ...
  Topic: KEF 105 vs 105/2
audiolabtower

Replies: 43
Views: 1400

PostForum: KEF Speakers from the 1970s   Posted: Sat Nov 03, 2018 9:34 pm   Subject: KEF 105 vs 105/2
Chef - I can now see your pics, having disabled Malwarebytes. The SP1100 labelled pcb in the pics is nothing like mine, which are the original type mounted behind the B110 enclosure, with a large hole ...
  Topic: KEF 105 vs 105/2
audiolabtower

Replies: 43
Views: 1400

PostForum: KEF Speakers from the 1970s   Posted: Sat Nov 03, 2018 8:57 pm   Subject: KEF 105 vs 105/2
Guru, the green wire photo (which my browser can't see) is not mine but T.O.Chef's, and are his modified crossovers, nothing to do with my crossovers or posts.

I can only state that my original pc ...
  Topic: KEF 105 vs 105/2
audiolabtower

Replies: 43
Views: 1400

PostForum: KEF Speakers from the 1970s   Posted: Sat Nov 03, 2018 3:57 pm   Subject: KEF 105 vs 105/2
If you mean 0.35mH then it does not make any sense since a second order filter followed by a third order filter plus the tweeter rolloff would not be the linkwitz design of a total design fourth order ...
  Topic: KEF 105 vs 105/2
audiolabtower

Replies: 43
Views: 1400

PostForum: KEF Speakers from the 1970s   Posted: Sat Nov 03, 2018 2:34 pm   Subject: KEF 105 vs 105/2
p.s. can't see your pictures Smile
  Topic: KEF 105 vs 105/2
audiolabtower

Replies: 43
Views: 1400

PostForum: KEF Speakers from the 1970s   Posted: Sat Nov 03, 2018 2:30 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
audiolabtower

Replies: 43
Views: 1400

PostForum: KEF Speakers from the 1970s   Posted: Fri Nov 02, 2018 6:23 pm   Subject: KEF 105 vs 105/2
C9 and C11 are open circuit on my board, but obviously there for the aB network if required.
  Topic: KEF 105 vs 105/2
audiolabtower

Replies: 43
Views: 1400

PostForum: KEF Speakers from the 1970s   Posted: Fri Nov 02, 2018 2:52 pm   Subject: KEF 105 vs 105/2
The 30uF is in parallel with the 0.028uF, thus both in series with the tweeter input. Can you see the link yet?
  Topic: KEF 105 vs 105/2
audiolabtower

Replies: 43
Views: 1400

PostForum: KEF Speakers from the 1970s   Posted: Fri Nov 02, 2018 12:17 am   Subject: KEF 105 vs 105/2
edited, try again.
  Topic: KEF 105 vs 105/2
audiolabtower

Replies: 43
Views: 1400

PostForum: KEF Speakers from the 1970s   Posted: Thu Nov 01, 2018 11:10 pm   Subject: KEF 105 vs 105/2
https://photos.app.goo.gl/fFrCCrYasywoT8pu6
  Topic: KEF 105 vs 105/2
audiolabtower

Replies: 43
Views: 1400

PostForum: KEF Speakers from the 1970s   Posted: Thu Nov 01, 2018 8:03 pm   Subject: KEF 105 vs 105/2
The 30uF is shown in a circuit diagram here, perhaps done by Colin some time ago. It was used when the aB circuit was deployed (since my 104aBs had an extra series 10uF in the same position) and open ...
 
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