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How To Repair MG 1.6 QR Foil?

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Posted on January 15, 2015 at 14:07:53
Teimon
Audiophile

Posts: 3
Location: Northwest
Joined: January 15, 2015



I recently purchased a pair of MG 1.6 QR speakers with socks that had been clawed by cats. When the old socks were removed, I also found some small cat nail punctures in the mylar, a couple of which puncture the tweeter QR foil in such a way that the foil is almost completely severed (see photo). The tweeters still work, but as long as I have the socks off I'd like to repair/fortify the iffy spots. I've searched this site (and the web) but can't find any info on how to repair breaks in QR foil. Any suggestions?

Any help would be much appreciated. Thanks.

 

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RE: How To Repair MG 1.6 QR Foil?, posted on January 15, 2015 at 21:05:14
MikeCh
Audiophile

Posts: 1113
Joined: November 16, 2002
 That's going to be a tricky repair since you'll need to remove some material off the wire on each side of the puncture so that you can apply a conductive patch over it. Would have been easier to repair if it were just a puncture in the Mylar.

OTOH, maybe this coating would work well enough if you can get it to permeate through the hole.

http://www.amazon.com/0-2ML-Silver-Conductive-Electrically-Repair/dp/B00HNHUZ08/ref=pd_sbs_op_4?ie=UTF8&refRID=0P3V7KSEJCEWNC8NW5VX

 

This is what I used, posted on January 17, 2015 at 10:35:31
Meatface
Audiophile

Posts: 189
Joined: November 26, 2011
 It has lasted about 3 years, so far. You'll have to carefully clean off the adhesive to get a good contact. If I remember correctly, I had painted a few layers, allowing them to dry between applications. After the repair there has been no audible difference.

 

RE: How To Repair MG 1.6 QR Foil?, posted on January 20, 2015 at 17:08:59
Teimon
Audiophile

Posts: 3
Location: Northwest
Joined: January 15, 2015
 Thanks for the suggestions. Both got me looking on Amazon, where I came across the following copper foil tape with conductive adhesive:

http://www.amazon.com/gp/product/B000UZ8SJK/ref=ox_sc_act_title_6?ie=UTF8&psc=1&smid=A23VKRUGUD63LA

Assuming the adhesive is really conductive (one reviewer claims otherwise), this would solve two problems - tape over the holes in the mylar AND bridge the aluminum QR foil.

Questions:
1. Has anyone used something like this on Magnepans?
2. Might a copper-aluminum joint cause corrosion problems down the line?

 

RE: How To Repair MG 1.6 QR Foil?, posted on January 20, 2015 at 22:53:30
Roger Gustavsson
Audiophile

Posts: 2055
Location: Huskvarna
Joined: February 12, 2010
 Why not use aluminium foil tape with conductive adhesive? http://tinyurl.com/kvu2fkg I would not go for a no-name product as the adhesive need to be good.

 

RE: How To Repair MG 1.6 QR Foil?, posted on January 21, 2015 at 11:08:39
Teimon
Audiophile

Posts: 3
Location: Northwest
Joined: January 15, 2015
 Thanks for the input. I found a similar 3M product on Amazon that is thinner in width and costs significantly less:

http://www.amazon.com/gp/product/B00KNU938M/ref=ox_sc_act_title_2?ie=UTF8&psc=1&smid=ATVPDKIKX0DER

I'm not sure if the difference between 3M 1170 and 1120 is significant - 1120 seems to have an ever so slightly thicker adhesive layer and minimally lower resistance per 3M spec sheets, but the 1/4" width of the above product (1120) is very close to the width of the Magnepan QR foil.

 

RE: How To Repair MG 1.6 QR Foil?, posted on January 26, 2015 at 20:50:51
MikeCh
Audiophile

Posts: 1113
Joined: November 16, 2002
 Just to reiterate, bridging over the puncture will not be effective unless your bridge material has something conductive to attach to on each end.

 

RE: How To Repair MG 1.6 QR Foil?, posted on February 8, 2015 at 14:56:57
JFShark
Audiophile

Posts: 43
Location: Baltimore
Joined: June 18, 2003
 I fixed this with a piece of aluminum foil trimmed to fit and centered in a piece of scotch tape applied to the surface. It's worked without a problem for two or three years now.

 

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