What glue for tangerine phase plug?

I open a 902-8A to find a loose plug. What is the best glue to use and are there tricks for centering it or for removing the old glue.

Thanks.

It looks like a super glue was used. It also looks like the centring can be done with match book covers. Anyone done this before I start?

I use super glue. Acetone to remove the glue from the metal. I use an exacto and a microscope to remove from the plug.....but we can't all do that. You just want to avoid gaps so it glues better.

Ron

I need to do the same project...but have it on the shelf for now as I became concerned about centering, and the other considerations listed. Would love to see this process documented - it would be a big help for future DIYers.

I don't know anything about phase plugs, nor their proper installation and alignment, but I do know glue. I'm having a hard time believing that cyanoacrylate (super glue) would be appropriate for this job. Cyanoacrylate is not a very permanent adhesive. Its tend to degrade over time and doesn't stand up well to vibration. I would think a plasticized cellulose based glue would be much better.

I found this on AK: It appears a lightweight epoxy is used. That doesn't bode well for cleaning and reinstalling it. I don't know what the Tangerine plug is made out of, but it's possible the cured epoxy is harder.

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Originally Posted by alancohen

I found this on AK: It appears a lightweight epoxy is used. That doesn't bode well for cleaning and reinstalling it. I don't know what the Tangerine plug is made out of, but it's possible the cured epoxy is harder.

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Very interesting Altec literature Alan! Any chance you can post a larger (higher resolution) version of it? The file/sizing is so small that I have to zoom in on it to try to read it and then it's all pixelated. I think the Altec Users Board may resize files like this one (makes them low res) when you upload them that way?

Here's a link to where I found it. Scroll down the page...

Metallic "tick" from altec horn? - Page 2 - AudioKarma.org Home Audio Stereo Discussion Forums

It seems the picture manager resized the images. Is this better?

Thanks for the responses so far.

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Originally Posted by RonSSS

I use super glue. Acetone to remove the glue from the metal. I use an exacto and a microscope to remove from the plug.....but we can't all do that. You just want to avoid gaps so it glues better.

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Hi Ron, I have removed the glue from the plug and metal by scraping carefully. That took about an hour and then I used non-acetone nail polish remover for the metal and plug. I think acetone can have adverse effects on plastic so I was glad my wife had the other stuff. Mind you the ingredients are very similar and it smells just like acetone. I think the ladies use it on those stick-on type nails so I was thinking it would be ok to use it on the plug. Seemed to work ok.

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Originally Posted by Alien_Shore

I need to do the same project...but have it on the shelf for now as I became concerned about centering, and the other considerations listed.

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A_S, centering will be easy with two matchbook covers inserted in the gap.

Quote:

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Originally Posted by alancohen

I found this on AK: It appears a lightweight epoxy is used. That doesn't bode well for cleaning and reinstalling it. I don't know what the Tangerine plug is made out of, but it's possible the cured epoxy is harder.

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Alan,
The lightweight epoxy seems to be used on everything but the plug. I'm sure that was super glue. Scraping it off was not hard so I can't see that as being epoxy. It also was covering the slits somewhat near the outside of the plug so removing it all was time consuming.

I think I will get the two part epoxy stuff from my local hardware store and will clamp it while it dries.

I decided to reassemble it and remount them to 811 horns while I was waiting for your responses. I did a side by side listen to them with a simple 50?fd cap on each. The one with the plug sounded like an Altec tweeter while the one without was a total midrange. The high end had almost disappeared and the mids were a lot stronger. A true squawker.