Vintage Products

Re: MS150.2 repairs

Step1 — Thu, 16 Sep 2010 18:28:56 GMT

Thanks, I am sure there weren't any a couple of years ago when I bought the kit but I may have missed them!

Re: MS150.2 repairs

Sam — Thu, 16 Sep 2010 16:41:21 GMT

Thanks Guys!

Feel I know what to look for now.

Martin - I will be using the proper method, with the dustcaps off, and shims! ;p

Step 1 -

Step1:

I can't see any reason why folks the like of goodhifi cannot provide dustcaps.

See here on his website: http://www.speakerrepairshop.com/index.php?item=dust-caps&action=page&group_id=12&lang=EN

Dustcaps galore!

Re: MS150.2 repairs

Step1 — Thu, 16 Sep 2010 13:34:18 GMT

Dillen:
I still haven't understood why people prefer to skip this important step. It keeps me busy, which is
fine with me, but I still would have preferred doing the actual refoam jobs rather than repairs to
what's left of a failed DIY attempt. It's cheaper too.

Martin

I would love to have shimmed the coils on my 120's however I could not source any suitably sized dust caps so very carefully used the method that seems popular. i.e. the feel and cross your fingers approach. I still want to replace the caps at some point as there are dent marks that I cannot get rid of but as these have no bearing on the sound it is not a priority.

I can't see any reason why folks the like of goodhifi cannot provide dustcaps.

BTW the glue I do not think is straight PVA as while it has a PVA consistanncy it smells like nail varnish!!! Maybe a mixture of the two?

Re: MS150.2 repairs

chartz — Thu, 16 Sep 2010 13:16:06 GMT

So, I'm sorry. It wasn't sarcasm but admiration... We all look up to Men of the Art, don't we?

Anyway, refoaming is a very scary business to me. I know some have had success.

I used to repair loudspeaker units when I was an impoverished student. I took them from the tip or the local repair guy and built cabinets and crossovers!

So I know how to do it basically, but I'm afraid of ruining these, which I actually paid for! And they still have their surrounds in one piece!

And I'm new to B&O speakers (MC120.2, they sound appalling, although in near-mint condition!)

Jacques

Re: MS150.2 repairs

Rich — Thu, 16 Sep 2010 11:37:20 GMT

Dillen:

I've been called many things in my life. Yoda is a first but not one of the worst and
I take it as a compliment.

Martin

Actually, the intent was for me to be Yoda (I am not worthy), and the quote I was stealing would really have equated you with Obi-Wan!

Re: MS150.2 repairs

Dillen — Thu, 16 Sep 2010 11:29:39 GMT

Don't get me wrong.
I am not looking for work, I have lots of it everyday.

It just hurts my poor old heart when I see what sometimes arrives here, knowing what it
could have been.
And I'm sure that many DIY'ers are succesful with what they do, I obviously
only hear from the not quite so succesful ones.

The flexible part sounds good but I really wouldn't recommend using a
glue that peels off easily (unless only on glass).
The woofer will work hard and the cones movements are quite strong.
Speaker cement is very tough and will hold on to almost anything, also glass,
and I use it for glass panel repairs too.
I don't have a brand name but I'm sure you can find some, maybe from a
pro speaker repairer or from production.
I've seen other good types of glue too, some contact glues will work fine
if not used the "contact"-way but only used on one surface, like the
black 3M stuff that doesn't pull into thin strings, but it's a royal mess to
clean up if it goes wrong or gets in the wrong places.

Wow, 50 euros for shipping to me, that's about as expensive as shipping from Denmark
and why I prefer to ship out from Germany whenever possible.

I've been called many things in my life. Yoda is a first but not one of the worst and
I take it as a compliment.

Martin

Re: MS150.2 repairs

chartz — Thu, 16 Sep 2010 10:51:19 GMT

Well I don't know what you use in Denmark Martin, but the vinyl glue we use here keeps a certain degree of flexibility too, even after years. You can actually see that on old pots where some glue leaked onto the jar... It peels off easily and it is indeed supple. I also use it to peel off debris on dirty Lp's!

Martin, it doesn't mean I wont send you my woofers! I just don't have the money right now (50€ to send them to you... argh!). But I am definitely ordering the caps, because I am deeply disappointed in these MC120's (see here).

Jacques

@Rich (your name?)

Rich:

The following is to be heard in your head as if Yoda were speaking:

Yyyyeeeesssss.....to Martin you listen!!!!!

Martin is a nice, knowledgeable man, so call him Yoda if you will... but please no sarcasm.

Re: MS150.2 repairs

Rich — Thu, 16 Sep 2010 10:48:59 GMT

Dillen:

And you will need shim'ing. Those woofers are too precious to skip that step.
I still haven't understood why people prefer to skip this important step.

Martin

The following is to be heard in your head as if Yoda were speaking:

Yyyyeeeesssss.....to Martin you listen!!!!!

Re: MS150.2 repairs

Dillen — Thu, 16 Sep 2010 10:23:16 GMT

Speaker cement looks a lot like woodworkers glue, that's correct, but speaker cement does not dry
up completely hard. It will remain a bit flexible, even after years.
Using a glue that hardens will introduce a stress zone in the surround material and the surround will
often develop cracks right at the glue edge.

Besides, woodworkers glue will not stick well to the metal basket.

And you will need shim'ing. Those woofers are too precious to skip that step.
I still haven't understood why people prefer to skip this important step. It keeps me busy, which is
fine with me, but I still would have preferred doing the actual refoam jobs rather than repairs to
what's left of a failed DIY attempt. It's cheaper too.

Martin

Re: MS150.2 repairs

chartz — Thu, 16 Sep 2010 09:59:10 GMT

Thanks Adam. Did you refoam yourself? How about a tutorial in HFW then?

Jacques

Re: MS150.2 repairs

AdamS — Thu, 16 Sep 2010 07:05:00 GMT

The PVA type adhesive is absolutely fine to use for refoaming - it's not actually far removed from what many loudspeaker manufacturers use! The joint between the cone/surround and the surround/chassis are not generally highly stressed, and both have a decent area of contact, so an uber-adhesive that will withstand an earthquake is not necessary. The joints for the cone/coil, suspension/coil and suspension/chassis are a different matter, however, and the likes of Loctite 4105 or 382 (both of which you can buy from Maplin) are often used here.

The other advantage with the PVA type glue is that it does not 'grab' instantly and so you have the ability to line everything up perfectly; doubly useful if you are not intending to shim the voice coil to keep it still whilst you operate. The corresponding disadvantage is, of course, that everything has to be held very firmly whilst it dries.

Best of luck with your MS150s. I was given a pair and ended up refoaming them and then donating them to a certain Mr. T Jarman! He loves them to bits and I'm very glad, but I'm still regretting my decision. I have since acquired a pair of M150s but they're just not the same, especially as I now also have a Beomaster 8000. Oh well........

Re: MS150.2 repairs

Sam — Wed, 15 Sep 2010 13:02:36 GMT

I've ordered the rings, but can anyone recomend me a glue to use?

Seems the internet doesn't like to tell what "real" speaker glue actually is, or where it can be found...

Re: MS150.2 repairs

Sam — Sat, 04 Sep 2010 09:31:50 GMT

Thanks Chirs,

crisis averted there! What brand of speaker cement would you reccomend to me then?

the dynaudio 8" are kind of plasticy coated, is there special stuff for that or does it all do the same job?

@Soundproof - that did make me smile, epecially as he thought he'd found a load of junk. Shame about the reputation of B&O being style over substance, when it quite clearly isn't!

And a very nice find indeed, what I'd give for a BM8000!! (And a 'gram 8002) :s

Re: MS150.2 repairs

Medogsfat — Thu, 02 Sep 2010 11:57:09 GMT

fleccky:

thinking of going with goodhifi's foams etc, and his... "special" glue

"Special glue" - ahem..... It's just a little bottle of PVA type adhesive & rubbish. Use proper speaker cement.

Chris.

Re: MS150.2 repairs

soundproof — Thu, 02 Sep 2010 11:39:13 GMT

I enjoyed this thread - you may find it useful.

http://www.audiokarma.org/forums/showthread.php?t=191250