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Thread: Tannoy Cheviots Replacing cone surround

  1. #1
    Join Date: Mar 2019

    Location: London

    Posts: 6
    I'm mick.

    Default Tannoy Cheviots Replacing cone surround

    Hi

    Im in the middle of replacing a tannoycheviot surround - (HPD315/8 spkr with Rolloff and energy knobs serial 512818). I know they lived unused for 25 years in a dry warm room but after a year of occaisional use this one started farting on specific bass frequencies and on examination the foam surround was flapping.

    I bought a pair or surrounds online and know Ive got the speaker out and the foam off. Ive cleaned the metal struts that hold the surround in place and most of the old foam
    off theunderside of the cone but the chassis still has a green coloured residue that is hard to remove especially as i risk damaging the cone. Is there any advantage in cleaning this off now ive removed all the loose bits of foam as i will just be gluing the new surround on top of it before replacing the struts?

    thanks in advance

    mick

  2. #2
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 39,939
    I'm Geoff.

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    Have you removerd the cones from the driver chassis? Installing new surrounds is far easier if you do and almost impossible to do properly otherwise. The are no metal struts. On the back of the cone are the Girdacoustic bracing ribs, they are made from similar paper based material as the cones and are fragile. The edge of the surround is sandwiched between these and the cone lip.
    "when common sense, logic and plausibility are excluded. All that remain are foolishness and lies"

  3. #3
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 39,939
    I'm Geoff.

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    I replaced the surrounds on my Cheviot Mk.II speakers some years ago. The thread is here: https://theartofsound.net/forum/show...intage+Tannoys

    You'll have to wade through a few pages, but it shows what was done. Mine have the later 3128 drive unit, not the HPD, but the principles are the same. There are cautionary remarks about not getting steel parts near the magnets, worth noting.
    "when common sense, logic and plausibility are excluded. All that remain are foolishness and lies"

  4. #4
    Join Date: May 2012

    Location: Dagenham Essex

    Posts: 8,881
    I'm I'mteachingmarcotheartofpishanto.

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    I sent mine to Lockwood audio , came back like new
    Music , fills the gaps between silence !

    TAT Sale post Leader " Marcos Mentor "

    Also a pishanto specialist confirmed by Head Daftee

    Real name " Allen " or "Zoomer Nut”, “Numpty Napper”.

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  5. #5
    Join Date: Mar 2019

    Location: London

    Posts: 6
    I'm mick.

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    Thanks for replies and links - I had read thru your great work in the link and suspect i may have mad e my first mistake as the surround kit ive got specifically says it is made to fit over the edge of the cone rather than underneath as the originals did. My question of struts was misworded as i meant the 4 quarter circle pieces that screw on over the edge of the surround and on your photo the surface is virtually clean.

    Yes ive avoided taking the cone off as the instructions with my kit was specific about it fitting over the cone not under - it says apply the glue provided to the "outer upper top edge" of the cone and i am currently in two minds as it could mean outer ie the very edge of the cone or all the way to the upper edge where the surround finishes and the cone heads down?

    Whatever I may just try it and thanks for the link to Lockwoods as its always good to have a backup plan

    best

    mick

  6. #6
    Join Date: Mar 2019

    Location: London

    Posts: 6
    I'm mick.

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    Thanks all for advice after a few moments of nerves ie cutting and gluing I have got a new surround in and working as well as the old one in the other speaker though I do intend
    to match them up after ive done some frequency tests - so nice to listen for pleasure with the warmth of the cheviots

    best

    mick

  7. #7
    Join Date: Mar 2016

    Location: Barnet, london UK

    Posts: 1,518
    I'm Adam.

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    hi mick, this thread would benefit greatly from pictures.
    "lack of passion is fatal"


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  8. #8
    Join Date: May 2012

    Location: Dagenham Essex

    Posts: 8,881
    I'm I'mteachingmarcotheartofpishanto.

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    Quote Originally Posted by WESTLOWER View Post
    hi mick, this thread would benefit greatly from pictures.
    Try doing this >
    Music , fills the gaps between silence !

    TAT Sale post Leader " Marcos Mentor "

    Also a pishanto specialist confirmed by Head Daftee

    Real name " Allen " or "Zoomer Nut”, “Numpty Napper”.

    ±± KEEP IT REEL

  9. #9
    Join Date: Mar 2019

    Location: London

    Posts: 6
    I'm mick.

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    Hi and thanks again - I admit I took no photos b4 replacing the surround. I didnt do anything unusual beyond taking the cone out, cleaning off all the gunk and then a few days looking at the bits b4 following basic instructions on the surrounds Id bought - applying glue to the edge of the cone and pressing in the surround repeatedly till it dried - then applying glue to the chassis and pressing down the edge of the surround over and over till it was dry. All the time testing the cone wasnt rubbing and nudging the drying surround till it wasnt. As I said the surround I bought specifically called it for it to be glued on top of the cone as opposed the original foam glued underneath so I had no need to take the cone appart. In fact I was very grateful for the link to Lockwoods as I spoke to them as a back up in case I messed up. I suspect proper reconing would improve them but as id started I thought i might as well complete the job. I cant tell the difference at the moment between the cheviot with the original surround and the one ive redone but I'll do more experiments before long as I have the second surround waiting

    Surround I used http://dump.superorg.com/Photo/Surro...%20Cheviot.JPG

    Completed http://dump.superorg.com/Photo/Completed.JPG


    I suspect I was a bit sparse on the cone glue and then liberal with the chassis glue but im sure that will show itself in time. The surround fit perfectly in one position of the clock though whether a generic 12" surround at a quarter of the cost would have been just as good I dont know.


    best

    mick


    Tannoy Cheviots and Cyrus2 Amplifier. Focal Twin Speakers for work. Most listening comes Digitally into my audio interface a Metric Halo ULN8 for quality D/A. Technics 1210 deck for vinyl

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