Just add some but as little as possible to the cracks. This is becuase you should add as little weight as possible to the speaker. Also are you talking about the same tek 7 becuase the reason i use it on sourrounds is becuase its strong but flexible if you use something like paper glue which is not flexible it will generate some nasty distortion.
Sony SS-5177 Made in Norway
- Thread starter Gurkov
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- 70's sony norway seas sony speakers
Gurkov
Active Member
Don’t know, I just googled Tek7 when you mentioned it. And all results pointed to the same Tec7 product. ”Fog- och tätningsmassa” in Swedish, sold on ”Classe” and a bunch of other stores...
I know you are excited over the Sony speakers but just wait a little bit i have to think this over. If you use the wrong glue you might damage the sourround but then again are there any noticable cracks? If not then you dont need to repair the sourround yet.
Gurkov
Active Member
Sure, no rush for me! I’m eager to learn, but I won’t touch anything unless I know exactly what I’m doing. And why.
If cracks cause distortion, I haven’t heard it at least. The dullness shouldn’t be due to that, right?
What do you make of this closeup of one of the woofers? Anything resembling a crack?
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Gurkov
Active Member
About the possible age / manufacturing year. Both woofer and mid says 46/73, which I gather means they were ”tested fine” in week 46 of 1973. Hey, anniversary coming up in just 9 days! 
Don’t know how long it could take for them to actually end up in a speaker, but if the 5177A line ran 1975 through 1976 (says Hifi Engine at least), then these A-less ones are probably older...
Don’t know how long it could take for them to actually end up in a speaker, but if the 5177A line ran 1975 through 1976 (says Hifi Engine at least), then these A-less ones are probably older...
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Yeah the tec 7 Will do Just fine.
https://skvis.no/nb-no/hjem-hage/ha...jqJqzcCrSqLV_6PmIE-bx_nFdickhEc8aAkTvEALw_wcB
This is just an example you dont have to order from this site. But are you sure its a crack and not some wierd paper deformation one easy way to tell is to take your finger under the sourround and push up under the crack gently if it begins to open you should seal it if its Just a paper deformation then you should probably leave it as is.
https://skvis.no/nb-no/hjem-hage/ha...jqJqzcCrSqLV_6PmIE-bx_nFdickhEc8aAkTvEALw_wcB
This is just an example you dont have to order from this site. But are you sure its a crack and not some wierd paper deformation one easy way to tell is to take your finger under the sourround and push up under the crack gently if it begins to open you should seal it if its Just a paper deformation then you should probably leave it as is.