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Thread: Kef Corelli SP1051 - possible fix and servicing.

  1. #21
    Join Date: Apr 2012

    Location: Southall, West London

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    I'm Geoff.

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    Quote Originally Posted by Edwardlon View Post
    Why do resistors put a furry coat on? Did they get cold or something?
    When the resistors get hot, the lacquer breaks down exposing the ceramic coating, which is porous and absorbs atmospheric moisture which evaporates when the resistor gets hot again loosening the surface, giving that fluffy look. It has no effect on the resistor's value.

  2. #22
    Join Date: Apr 2012

    Location: Southall, West London

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    I'm Geoff.

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    Quote Originally Posted by Edwardlon View Post
    But anyway this is only a fun learning project - I really don't need more speakers. My wife was amused when I told her I had got yet another set of speakers - this would be my 6th set. But she could not argue against 12.50
    If you get these working nicely, you'll probably like them as much as your Tannoys. I use mine alongside the Cheviots and both sound excellent.

  3. #23
    Join Date: Mar 2017

    Location: London N2

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    I'm Edward.

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    Quote Originally Posted by walpurgis View Post
    If you get these working nicely, you'll probably like them as much as your Tannoys. I use mine alongside the Cheviots and both sound excellent.

    I'll be very pleasantly surprised if the Kefs get anywhere near the sq of the Tannoys.

    Speaking of which I will be away late March for a while so I plan on having Paul at RFC do a recap and other work on them then. He says his fettling will further improve the Eatons.
    Source: Tidal/Roon
    DAC: Metrum HEX NOS

    Amp: Sugden Masterclass 2018 spec, Radford Revival STA25,
    Speakers: Tannoy Eaton


  4. #24
    Join Date: Mar 2017

    Location: London N2

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    I'm Edward.

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    So I pulled out one of the crossovers, made a list and went along to Cricklewood Electronics to get the caps.

    A bit of confusion on values etc but I think I got correct ones but would most appreciate a double check.

    First value is what is on the xover and second value is what I bought. I took the xover with me and the guy at the shop was most helpful.


    2 x 30 mfd (50v) - 2 x 30 uF (100v)

    4 x 10 mfd (50v) - 4 x 10uF (100vnp)

    4 x 5 mfd (50v) - 4 x 4.7uF (100 vnp) 4.7mfd was the closest they had.

    2 x 3.3 mfd (50v) - 2 x 3.3uF (50 vnp)

    2 x 0.69 mfd (50v) 2 x MA684k 630v (am confused about this).

    Also, from schematic I got from the interweb, tried to ascertain what resister is used. So purchased 2 of 4r7 5% 58ev. But will likely not replace them.

    Here is the schematic I found, some values are different to what was on the xover so whoever put the schematic together may have got things incorrect.

    Source: Tidal/Roon
    DAC: Metrum HEX NOS

    Amp: Sugden Masterclass 2018 spec, Radford Revival STA25,
    Speakers: Tannoy Eaton


  5. #25
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 36,257
    I'm Geoff.

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    All looks OK apart from this:

    Quote Originally Posted by Edwardlon View Post
    2 x 0.69 mfd (50v) 2 x MA684k 630v (am confused about this).
    I'm not sure what you've been given there.

    The value is 0.6uF. I used 0.56uF which is close enough. I have plenty of spares.

    That schematic is wrong by the way.

  6. #26
    Join Date: Mar 2017

    Location: London N2

    Posts: 917
    I'm Edward.

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    Quote Originally Posted by walpurgis View Post
    All looks OK apart from this:



    I'm not sure what you've been given there.

    The value is 0.6uF. I used 0.56uF which is close enough. I have plenty of spares.

    That schematic is wrong by the way.
    Ah thanks Geoff. Is the new resistor ok or should I leave well alone?

    PM incoming btw.

    cheers
    Edward
    Source: Tidal/Roon
    DAC: Metrum HEX NOS

    Amp: Sugden Masterclass 2018 spec, Radford Revival STA25,
    Speakers: Tannoy Eaton


  7. #27
    Join Date: Apr 2012

    Location: Southall, West London

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    I'm Geoff.

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    Chances are the resistors are fine, although changing them for the 4.7 ohm ones won't hurt if you want to.

    In every photo I've seen online of the Corelli crossover, those resistors are furry. Mine aren't though.

  8. #28
    Join Date: Mar 2017

    Location: London N2

    Posts: 917
    I'm Edward.

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    Quote Originally Posted by walpurgis View Post
    Chances are the resistors are fine, although changing them for the 4.7 ohm ones won't hurt if you want to.

    In every photo I've seen online of the Corelli crossover, those resistors are furry. Mine aren't though.
    Can one measure the resistance value whilst still in circuit?

    On some of the caps I got they will have to stand quite proud due to size issues.
    Source: Tidal/Roon
    DAC: Metrum HEX NOS

    Amp: Sugden Masterclass 2018 spec, Radford Revival STA25,
    Speakers: Tannoy Eaton


  9. #29
    Join Date: Feb 2013

    Location: W Lothian

    Posts: 46,160
    I'm Grant.

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    not really. you will get spurious readings
    Regards,
    Grant ....

    I've said it before and I'll say it again: democracy simply-doesn't-work
    .... ..... ...... ...... ................... ..... ..... ..... ..... .....
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  10. #30
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 36,257
    I'm Geoff.

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    Quote Originally Posted by Edwardlon View Post
    On some of the caps I got they will have to stand quite proud due to size issues.
    I did mention the size difference. If you think the caps may vibrate against each other, use a little blob of silicone sealant between them. You won't need much. A small tube will be enough. I use clear, but any colour will do obviously.

    Like this: http://www.ebay.co.uk/itm/SILICONE-T...AAAOSw~oFZx873

    Some bargain shops or pound shops stock it too.

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