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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
T.O. Chef

Replies: 43
Views: 1400

PostForum: KEF Speakers from the 1970s   Posted: Tue Nov 06, 2018 9:56 pm   Subject: KEF 105 vs 105/2
Now that I'm as far as I think I can go using the filters that came with this 105 set (following Guru's advise, Thank You Sir) I am pleased as punch with what they can do with good material.

I have ...
  Topic: KEF 105 vs 105/2
T.O. Chef

Replies: 43
Views: 1400

PostForum: KEF Speakers from the 1970s   Posted: Sun Nov 04, 2018 3:50 pm   Subject: KEF 105 vs 105/2
Curiousuer and Curiouser.

How so very interesting there should be so many incarnations.
Just tweaking along the way, or do you think because of varying characteristics between driver productio ...
  Topic: KEF 105 vs 105/2
T.O. Chef

Replies: 43
Views: 1400

PostForum: KEF Speakers from the 1970s   Posted: Sun Nov 04, 2018 2:43 pm   Subject: KEF 105 vs 105/2
If anyone here should be interested, here's what the nearly complete restoration of my 105's looks like.
I do have the original full size cloth covered shrouds in good condition, but somehow I prefer ...
  Topic: KEF 105 vs 105/2
T.O. Chef

Replies: 43
Views: 1400

PostForum: KEF Speakers from the 1970s   Posted: Sun Nov 04, 2018 2:15 pm   Subject: KEF 105 vs 105/2
Gentlemen, you know infinitely more than I about crossover design and particularly KEF.
I can't thank you enough for your patience and generosity taking the time to both assist and educate me.
It' ...
  Topic: KEF 105 vs 105/2
T.O. Chef

Replies: 43
Views: 1400

PostForum: KEF Speakers from the 1970s   Posted: Sun Nov 04, 2018 3:29 am   Subject: KEF 105 vs 105/2
BTW .... Jerry (Falcon) seems to be aware of this configuration.
The cap set he sent me was an exact duplicate of what's shownin on the board as found (by me(.
As you can see from the photo.
Confused
  Topic: KEF 105 vs 105/2
T.O. Chef

Replies: 43
Views: 1400

PostForum: KEF Speakers from the 1970s   Posted: Sun Nov 04, 2018 3:25 am   Subject: KEF 105 vs 105/2
Yes. I know exactly what you're talking about with the 105 crossover mounting and component layout.
What you describe is precisely the same as the 2 pairs of 105's I have had the pleasure of restori ...
  Topic: KEF 105 vs 105/2
T.O. Chef

Replies: 43
Views: 1400

PostForum: KEF Speakers from the 1970s   Posted: Sat Nov 03, 2018 3:15 pm   Subject: KEF 105 vs 105/2
It would seem to me that if the board had not been modified with the cut in the trace then the circuit would have been : 30uF series, 0.028mH to ground, then 3.3uF series, 0.35uF to ground, 7uF series ...
  Topic: KEF 105 vs 105/2
T.O. Chef

Replies: 43
Views: 1400

PostForum: KEF Speakers from the 1970s   Posted: Sat Nov 03, 2018 2:13 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
T.O. Chef

Replies: 43
Views: 1400

PostForum: KEF Speakers from the 1970s   Posted: Sat Nov 03, 2018 1:10 am   Subject: KEF 105 vs 105/2
MAYBE .... someone saw that crossover configuration on-line somewhere and decided this filter was incorrectly made? Then added the 30uF to match?
That seems feasible.
It doesn't explain the etched ...
  Topic: KEF 105 vs 105/2
T.O. Chef

Replies: 43
Views: 1400

PostForum: KEF Speakers from the 1970s   Posted: Sat Nov 03, 2018 1:05 am   Subject: KEF 105 vs 105/2
It's possible the input for the hf section was taken after the 30uF capacitor in the MF circuit. That could work, as 30uF is pretty much a short circuit at tweeter frequencies, but I can't think why i ...
  Topic: KEF 105 vs 105/2
T.O. Chef

Replies: 43
Views: 1400

PostForum: KEF Speakers from the 1970s   Posted: Fri Nov 02, 2018 9:47 pm   Subject: KEF 105 vs 105/2
Guru, thank you very much for that link explaining and calculating Tank Circuits. That has helped immensely analyzing a big issue.

I first reinstalled the aB circuit. Both sides test audibly very c ...
  Topic: KEF 105 vs 105/2
T.O. Chef

Replies: 43
Views: 1400

PostForum: KEF Speakers from the 1970s   Posted: Fri Nov 02, 2018 3:54 pm   Subject: KEF 105 vs 105/2
AH!!! Thank you Audiolabtower.
So there it is. my filter exactly (minus the aB) and it was the Mark ! version sporting it.
This is wonderful information, I'm so glad to know my crossover is not s ...
  Topic: KEF 105 vs 105/2
T.O. Chef

Replies: 43
Views: 1400

PostForum: KEF Speakers from the 1970s   Posted: Fri Nov 02, 2018 12:51 am   Subject: KEF 105 vs 105/2
I see a huge series cap set on the HF input of that 105/2 layout as published by Colin. Not a parallel one.

I've been up and down all 105 crossover configurations, and actually have a set of 105/2 ...
  Topic: KEF 105 vs 105/2
T.O. Chef

Replies: 43
Views: 1400

PostForum: KEF Speakers from the 1970s   Posted: Fri Nov 02, 2018 12:16 am   Subject: KEF 105 vs 105/2
Alas ... no Google account here.
Reasons abound, but I won't get into them. Suffice to say, After 2 years I was finally able to escape from their grasp.

Oh how I wish we could all just do this wi ...
  Topic: KEF 105 vs 105/2
T.O. Chef

Replies: 43
Views: 1400

PostForum: KEF Speakers from the 1970s   Posted: Thu Nov 01, 2018 11:02 pm   Subject: KEF 105 vs 105/2
I'd love to see that schematic AudioLT. Was it intended to be attached?

I guess then my questions are:
How crucial is the value of that cap. In my case a 30uF.
And, can I assume that inductor ...
 
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