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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 vs 105/2
speakerguru

Replies: 43
Views: 647

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: 647

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: 647

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: 647

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: 647

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: 647

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: 89

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: 713

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: 345

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

Replies: 5
Views: 345

PostForum: KEF speakers   Posted: Tue Oct 09, 2018 10:18 pm   Subject: 105/3 -B160(SP1257)- Adhesive recommendation/repair advice?
...I'm assuming a pva should be ok and will not melt anything...

"pva" doesn't narrow it down a lot. There are so many variations. Most white "PVA" wood glues would not work on ...
  Topic: 105/3 -B160(SP1257)- Adhesive recommendation/repair advice?
speakerguru

Replies: 5
Views: 345

PostForum: KEF speakers   Posted: Mon Oct 08, 2018 10:17 pm   Subject: 105/3 -B160(SP1257)- Adhesive recommendation/repair advice?
Assuming the voice coils are not rubbing, then re-sticking locally should be OK.

See http://www.hifiloudspeakers.info/speakertalk/viewtopic.php?t=1655 for some info on the original adhesive, which ...
  Topic: Advice please on 105-II recap
speakerguru

Replies: 17
Views: 713

PostForum: KEF Speakers from the 1970s   Posted: Fri Oct 05, 2018 8:52 am   Subject: Advice please on 105-II recap
.... 105-2 has a bigger magnet en slightly more output than my constructor series B300 SP1071 (marked): Magnet diameter 128 mm vs 123 mm, thickness 24mm vs 21 mm.

In overall sound the bigger magnet ...
  Topic: Advice please on 105-II recap
speakerguru

Replies: 17
Views: 713

PostForum: KEF Speakers from the 1970s   Posted: Thu Oct 04, 2018 1:15 pm   Subject: Advice please on 105-II recap
...I noticed that the S-stop print takes some signal from the blue tweeter lead (apart from the overall signal before the relay, the red lead).
Maybe, a faulty the S-stop here causes a power drain fr ...
  Topic: Advice please on 105-II recap
speakerguru

Replies: 17
Views: 713

PostForum: KEF Speakers from the 1970s   Posted: Mon Oct 01, 2018 11:40 am   Subject: Advice please on 105-II recap
I wonder if Guru could give an idea if altering the resistor value would reduce the high freq impedance just a little to give a little more energy in that region (amplifier stability taken for granted ...
  Topic: KEF 105 vs 105/2
speakerguru

Replies: 43
Views: 647

PostForum: KEF Speakers from the 1970s   Posted: Fri Sep 14, 2018 10:12 am   Subject: KEF 105 vs 105/2
I understand that the graph will never be near flat, but this roller-coaster is unlike anything I've seen with its huge peaks and valleys. And Never have I seem the bass section with a giant top curv ...
 
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