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Thread: Renovation of Celestion 66 Studio Monitors

  1. #1
    Join Date: Jan 2013

    Location: Durham - UK

    Posts: 1,314
    I'm Ken.

    Default Renovation of Celestion 66 Studio Monitors



    These are the Celestion 66 Studio Monitors I purchased off Fleabay.
    They have very nice cabinets with good original grill cloth and badges, I got them for a ridiculously low price. The following is the story of their renovation back to full working order.






    They are an early version unofficially referred to as Mk I.
    When you take the grills off they don't look so smart and certainly look their age.







    The drivers show all the signs of being stored for years unused.
    The tweeter covers had unglued themselves and were lying inside the main grill covers.






    Here is where things get ugly, both bass drivers have perished surrounds, but I knew that when I bought them, that's why they were so cheap. Within a minute of winning them in an auction on Fleabay I also had an offer of £80 accepted for a pair of early 66 bass drivers that looked in great condition, they will be going in as soon as possible. Strangely enough the two original drivers still measure the correct resistance so I will keep them for now.







    That's the first cabinet stripped out and ready for work to start.
    First thing I did was paint the horrible white glue line around the edge of the baffle board. Some satin black and an artists brush did the trick. The sides and back of the cabinet seem relatively stiff and resonance free. The top and bottom seem very boxy when you give them the old knuckle wrap - I will be applying a bitumen dead sheet to both.
    As you can see my workshop - err kitchen - is in a bit of a mess at the moment, sooo many projects.






    That's the x-over, confirming they are an early (Mk I) version. It's taken as a wiring reference should I forget how it all goes back together. I will be keeping everything pretty much as original as a first step. Once I have got used to how they sound I will consider upgrades such as re capping and even the tweeter upgrades. For now I will simply renew the puny internal wiring and the binding posts, as one of my posts is broken.

    More to follow………..
    Ken

    http://www.jkwynn.co.uk/
    DIY Technics/ProJect based Turntable + Terminator linear tracker + Ortofon MC20 Supreme / Pro-Ject Phono box & Pre Box RS / KMTech Active X-Over / Nakamichi AVP1 Power / DIY Sealed Three Way Speakers / Stello CDT100 Transport / DAC Magic.

  2. #2
    Join Date: Jan 2012

    Location: leicestershire

    Posts: 649
    I'm John.

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    Nice cabinets......looking forward to following the renovation.
    You won't be disappointed with the 66s.....currently listening to The Muswell Hillbillies through mine.
    ----------------------------------------------------------------------------------
    Technics 1210/Mike New Bearing/Jelco SA750d/Goldring 2500/Paul Hynes SR5 21/27.
    Cambridge Audio 840c CD. Squeezebox Touch. Synology NAS.
    Teac A-3440.
    Beresford Bushmaster.
    Quad II monoblocks....Quad 44/405.....Croft Micro.....Cambridge Audio 840.
    Celestion Ditton 66.....KEF Reference One

  3. #3
    Join Date: Jan 2013

    Location: Durham - UK

    Posts: 1,314
    I'm Ken.

    Default

    John - yes they were just too good to pass on, I had to pull the trigger.

    Need a bit of work but I think they will tidy up nicely.

    Never actually heard a set but everyone I speak to has good things to say about them - can't wait.
    Ken

    http://www.jkwynn.co.uk/
    DIY Technics/ProJect based Turntable + Terminator linear tracker + Ortofon MC20 Supreme / Pro-Ject Phono box & Pre Box RS / KMTech Active X-Over / Nakamichi AVP1 Power / DIY Sealed Three Way Speakers / Stello CDT100 Transport / DAC Magic.

  4. #4
    Join Date: Nov 2013

    Location: Yorkshire

    Posts: 4,271
    I'm Andr'e.

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    Even thought the 'Ditton' fad is over with most people this should be very interesting thread, look forward to the finished article..

  5. #5
    Join Date: Nov 2010

    Location: Yorkshire

    Posts: 6,608
    I'm AnDreW.

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    Quote Originally Posted by The Barbarian View Post
    Even thought the 'Ditton' fad is over with most people this should be very interesting thread, look forward to the finished article..
    Ouch! They ain't that bad.
    SS CD Teac VRDS25X(Mega Modded) DAC Caiman SEG+Anker PSU DECK 1210 Mat Analouge Studio Crystal Mods MN Base/Bearing/Platter+Ebony arm Board Feet Isonoe PSU Paul Hynes SR7EHD-27XL/DCSXL Ag DC lead/Jaeger(low-impedance) connector/3 StageRegs/Recapped PCB+No Pitch/Strobe/Light ARM SME V(Kondo Ag Rewire&Tags) MCOrtofon Cadenza Black CABLES Arm Yannis SPD-4 IC Yannis 222 Litz+Ag bullets Power WAR PRE ATC SCA2 SPEAKERS ATC 50ASL STANDS Atacama PHONO Sugden Masterclass PA4 SUT Ortofon ST80SE POWER PSAudio P10

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  6. #6
    Join Date: Jan 2009

    Location: Sheffield - UK

    Posts: 5,672
    I'm Mark.

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    That crossover is interesting Ken - all air-coed coils and point to point hard wired. It's odd that the coils aren't orientated a bit better though.

    100% Analogue

  7. #7
    Join Date: Jan 2013

    Location: Durham - UK

    Posts: 1,314
    I'm Ken.

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    Mark - If I do a re-cap at some point it would be good to try and re-orientate the coils at the same time. (Possible phase II)
    Ken

    http://www.jkwynn.co.uk/
    DIY Technics/ProJect based Turntable + Terminator linear tracker + Ortofon MC20 Supreme / Pro-Ject Phono box & Pre Box RS / KMTech Active X-Over / Nakamichi AVP1 Power / DIY Sealed Three Way Speakers / Stello CDT100 Transport / DAC Magic.

  8. #8
    Join Date: Jan 2009

    Location: Sheffield - UK

    Posts: 5,672
    I'm Mark.

    Default Renovation of Celestion 66 Studio Monitors

    Repositioning the coils isn't difficult, certainly not for someone with your DIY expertise . As fas as caps are concerned, there only looks to be one electrolytic in the whole thing!

    100% Analogue

  9. #9
    Join Date: Jan 2013

    Location: Bristol

    Posts: 3,174
    I'm Justin.

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    Well, I'd rather a pair of 66s than, say, a pair of LV OBX-R2s, to which, IMHO, the Celestions give a massive hiding. At massively reduced cost.

    If you get them working well, they'll easily beat 90% of the speakers that were at this years Bristol Hi-Fi show. In my opinion, that is.
    In the cup - Indian Bibi Peaberry

  10. #10
    Join Date: Jan 2013

    Location: Durham - UK

    Posts: 1,314
    I'm Ken.

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    I think those big bundles of 6 and 9 caps are elctrolytics, to be honest I haven't had time to go there yet.

    There is a huge thread generated over a period of about five years covering all kinds of 66 based stuff on diyaudio.

    When you swap out the old electrolytics for modern polyprops you have to add a risistor in series to keep the values as original.

    They give the values required. Lots of frequancy plots etc. I will get into all that later on, my immediate task is to get a working set to standard spec.
    Last edited by Qwin; 14-04-2014 at 15:33.
    Ken

    http://www.jkwynn.co.uk/
    DIY Technics/ProJect based Turntable + Terminator linear tracker + Ortofon MC20 Supreme / Pro-Ject Phono box & Pre Box RS / KMTech Active X-Over / Nakamichi AVP1 Power / DIY Sealed Three Way Speakers / Stello CDT100 Transport / DAC Magic.

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