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How to Repair or replace KEF R101 Crossovers

 
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SteveP
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Joined: 20 Sep 2008
Posts: 3

PostPosted: Sat Sep 27, 2008 11:40 am    Post subject: How to Repair or replace KEF R101 Crossovers Reply with quote

Hi

I have a pair of Kef Reference 101s which recently developed a fault in one of the crossovers.
( I swapped the modules and found that the drive units were fine.)

I use them for hi fi and monitoring/mastering, and love the sound - very uncoloured- mine could just do with a little bit of high end.

I have seen the schematic- without SSTOP circuitry, and component list,
by Steve Bell
I'm wondering what my options are?

1.Can I remove the SSTOP modules - if so , how do I adapt the connections o the circuit board?
2. Could the SSTOP be still be working, and one or more of the components need replacing?
3. Can I build 2 replacment units per the design, or are there better crossover designs available - I've heard that the R101 crossover design is probably better than the LS35A - since it has a flatter crossover response and no lower midrange accent?
- Maybe I could use a veroboard - and a bit of soldering practise -per the "wilmslow" thread.

I'd be grateful for some help as I really love these speakers and don't wan to give up on them - and I'd like to find a decent valve power amp to drive them - I think they'd be even more impressive.

Thanks
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ColinR
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Joined: 31 Jul 2004
Posts: 1175
Location: Staffordshire

PostPosted: Sat Sep 27, 2008 2:46 pm    Post subject: Reply with quote

Quote:
which recently developed a fault in one of the crossovers


Without you describing the fault as fully as you could with details of any PCB track damage due to a leaking capacitor or the particular varient of S-STOP in your 101.

Read all of this thread as the Ref 103-2 only has one more component in it's crossover design, so diagnosis/repair/modification will be the same.

http://www.hifiloudspeakers.info/speakertalk/viewtopic.php?t=777

Regarding amplifiers buy a Quad 520 varient, they work rather well with Ref 101s Cool .
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SteveP
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Joined: 20 Sep 2008
Posts: 3

PostPosted: Sat Sep 27, 2008 5:01 pm    Post subject: Reply with quote

Many thanks Colin.

I'll look at the board/components, and have the option of removing the 680k resistor.

Steve
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speakerguru
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Joined: 18 Nov 2005
Posts: 958
Location: Green Hut, Tovil

PostPosted: Mon Sep 29, 2008 8:14 am    Post subject: Reply with quote

The most llikely problem is deterioration of the relay contacts. Short across the contacts to check.
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SteveP
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Joined: 20 Sep 2008
Posts: 3

PostPosted: Sat Oct 04, 2008 2:50 pm    Post subject: Reply with quote

Thanks, I'll check this out. I've had a busy week and am looking forward to getting to grips with this

Regards

Steve Pierce
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