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Thread: Tannoy Cheviots Replacing cone surround

  1. #1
    Join Date: Mar 2019

    Location: London

    Posts: 4
    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: 39,310
    I'm Geoff.

    Default

    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: 39,310
    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: 8,702
    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 "

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  5. #5
    Join Date: Mar 2019

    Location: London

    Posts: 4
    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

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