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In Reply to: RE: MMG-W buzzing posted by JBen on September 12, 2014 at 11:50:41
I talked with Sheila at Magnepan. She said that they switched to 30NF in Nov of 2005. So, the adhesives used in 2004 were the Super 77 to hold down the wires, then top coated with Milloxane. There sure does not seem to be much of a top coat on this assembly. But, this is my first look at a Maggie.
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So, it is the old glue after all. Well, let the fun begin...glue away! LOL
That is, unless you have questions even after all that you have read. Let us know if you need clarification on how to proceed. Or, you can state your plan of action and we can help you polish it, if need be.
I would suggest that you plan to do it in stages; perhaps just a couple of wires at first. It is not just to get the feel for doing it. In addition, you may learn what is the state of the rest of the wires. We still don't know what caused these wires to become unglued. When I have had to reglue in the past, I pretty much knew what caused the issue (usually, stupid me pushing test SPL sky high on MMGs from the previous century : - ))
Thanks. I still have my original question: Can I just re-glue the loose section with DAP, or do I need to go for a complete rebuild? I'm not intimidated by the gluing process. But, why not just tack down the "loose" wires and move on?
That's what I mean, yes. At this point you can start to glue back on just the segments that need it.
Hmmm, perhaps I should have not erased some stuff that I wrote and then edited out. Here are a few that remained in the paste buffer.
-- Clean the Mylar under each wire to be reglued with acetone but keep the good areas untouched. Carefully -- and on a fully horrizontal level -- acetone-moist cotton swabs and thin brushes can help to contain the treatment areas. You don't want the acetone running up to -- and weakening -- other good areas. I do the same cleanup with acetone under each segment of wire to be glued...a bit tedious but seemingly worth it.
-- DAP is good and proven. So is E-6000, which I have adopted since Neolith first reported about it a few years ago. Both have worked on my MMGs, which get tremendously abused at times. (and both have failed under some situations. If they do, E-6000 tends to do so more "graciously".)
Taking things slowly at first may reveal issues not yet seen, without aggravating what is good. Unless this speaker suffered a strumming type of trauma across the wires (that you never saw), there's a chance that the remainder of the still-glued sections could be weak anyway. Then, it would have to be a rebuild. Hopefully, this is not the case.
Thanks JBen. I will check into the E-6000.
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