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Kef 104ab acoustic contour control

 
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Richie
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Location: Northamptonshire

PostPosted: Sat Jan 08, 2011 8:23 pm    Post subject: Kef 104ab acoustic contour control Reply with quote

Kef 104ab, is it possible/worth by passing the acoustic contour control ?
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audiolabtower
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PostPosted: Sat Jan 08, 2011 10:16 pm    Post subject: Reply with quote

try switch cleaner on the contacts, or solder a shorting wire between the contact terminals and see if you can hear a difference?
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ColinR
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PostPosted: Tue Jan 11, 2011 2:39 pm    Post subject: Reply with quote

Quote:
try switch cleaner on the contacts


For serious gunk on switches and PCBs a fine brass wire clothes brush (for velvet) cleans up contacts nicely Cool .
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Richie
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PostPosted: Tue Jan 11, 2011 4:21 pm    Post subject: Reply with quote

Thanks for that, I'm not sure there is anything actually wrong with the switchs I just wondered if by passing them would improve the sound.
Anyway new caps arrived today so I have to pluck up the courage to try soldering them on....... fingers crossed.
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T.O. Chef
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PostPosted: Tue Jan 11, 2011 9:04 pm    Post subject: Reply with quote

Love the Avatar white 104's Richie
Do you have a pair of those? What's the finish applied with? Is it a plastic, a paint?
Do let us know how the re-cap goes please. Are you using all electrolytic cap's? Alcap? Are you changing the 0.6uF to a Solen?
I for one am quite interested to hear your take on the results.
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speakerguru
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PostPosted: Wed Jan 12, 2011 12:40 pm    Post subject: Reply with quote

Richie wrote:
.... I'm not sure there is anything actually wrong with the switches I just wondered if by passing them would improve the sound...

Do you mean will two soldered joints sound better than one metal to metal contact? The answer is only if the switch is dirty or corroded.
Some experiments to try:
Spray the switch with cleaner/lubricant and see if you can hear a change.
Solder a link across the contacts and see if you can hear a difference.
What the switch does is select a different tap on an inductor, so you could also try to bypass with a link on the pcb.

I very much doubt that you will hear anything provided the switch has been turned a few times to scrape away any oxide. You might also check the fuses, while you're at it. The ends can tarnish over time.
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Richie
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PostPosted: Wed Jan 12, 2011 4:49 pm    Post subject: Reply with quote

T.O. I think its a paint finish, what ever it is its very good. Seems it was a Kef option way back when.
I just bought the Falcon Acoustics 104ab cap. replacement kit (x2)

I'll try the things you suggest guru, I thought many people by-passed the fuse to ?
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Richie
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PostPosted: Wed Jan 12, 2011 4:57 pm    Post subject: Reply with quote

[img]http://myhifi.homestead.com/T27-Tweeters.html[/img]

Here's another thing, I have just replaced a dud tweeter, but the replacement has a screw in the back, whats that about ??
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Richie
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PostPosted: Thu Jan 13, 2011 8:05 pm    Post subject: Reply with quote

I wish I could get these hot links to work..... any idea's ?
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T.O. Chef
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PostPosted: Thu Jan 13, 2011 11:53 pm    Post subject: Reply with quote

Ritchie .. you have a PM
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