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Good old B139's gliceryn treatment

 
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Wiesiek Lipowski
Intermediate Contributor 25+


Joined: 10 Dec 2006
Posts: 39
Location: Poland

PostPosted: Thu Oct 10, 2013 12:13 am    Post subject: Good old B139's gliceryn treatment Reply with quote

That's what I come across on another website:

http://www.diyaudio.com/forums/multi-way/243413-kef-b139-sp1044-fs-43hz.html

What do you think, dudes?
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proffski
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Joined: 22 Aug 2003
Posts: 1296
Location: Tewkesbury UK

PostPosted: Thu Oct 10, 2013 8:09 am    Post subject: Re: Good old B139's gliceryn treatment Reply with quote

Thank you for that most interesting morsel Wiesiek!

That is rather scary, I was aware of old phono cartridges sounding bad for the same reasons but this is a revelation indeed!
I'll speak to my resident chemist regarding long term effects of glycerol on butyl rubber. Colin would have had the answer by now...
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audiolabtower
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Joined: 06 Jan 2009
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PostPosted: Thu Oct 10, 2013 9:50 am    Post subject: Reply with quote

Derek Hughes, designer of Spendor speakers after Spencer, has used brake fluid on surrounds of specific speakers he designed years ago and shown results on the Yahoo Spendor forum. The exact fluid required depended on the material of the original surround (early Spendors did not have a problem) but SOME later polypropylene driver surrounds hardened over time. The painting of the surrounds significantly decreased the resonant freq of the driver, bringing it back much closer to spec and improving subjective results considerably. Long term results remain to be seen and reported but it looks worthwhile so far. Again the exact fluid (eg Dot 3 or 4) must be compatible with the exact material of the surround so this information is paramount. Brake fluid is designed to keep rubber pipes supple and prevent hardening and cracking so the idea is not at all out of hand.
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