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.
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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.
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?Quote:
Originally Posted by alancohen
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.
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.Quote:
Originally Posted by RonSSS
A_S, centering will be easy with two matchbook covers inserted in the gap.Quote:
Originally Posted by Alien_Shore
Alan,Quote:
Originally Posted by alancohen
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.
Six years ago, I used Loctitie All Plastics Super Glue on a 902 phase plug. It's a 2 part with a bonding agent and activator. As far as I know, it's still holding strong today. I think you can find it at Home Depot. I also used paper shims in the gap for alignment.
Good luck.
Thank you.
I like to use silicone as a glue, bonds to most things and holds pretty good.
I agree that it does look like super glue was used at the factory - can anyone who worked there confirm?
If it is, it sure explains why so many of them fall off. :rolleyes:
As far as the document referenced, here is the full-sized page:
802-8G detail
They probably used epoxy to hold the wire to the former, the former to the diaphragm and the diaphragm to the basket. They probably also used it to hold the metal parts of the motor together.
My Home Depot did not have an Epoxy for plastics so I got the Loctite All Plastics Super Glue that miker1 mentioned.
The surfaces were all scraped clean then wiped with the non-acetone nail cleaner with a lint free cloth and then with an alcohol swab to reduce any chance of residue. I then applied the bonding agent and glue as directed using glue only on the upper half of the motor 'cup'. I didn't need the matchbook cover as the plug centered itself. So far so good. Will update if anything bad happens.
I remember Jerry Hubbard saying it was a special type of glue - not anything that you'd normally find just anywhere.
Why not ask Hanuschak?
Hi Todd,
I have done the gluing and let it play all evening. They feel very solid and there is no glue in the slits like originally. The two drivers sound the same so I think it went well.
Bill H? No thanks, not had good luck in dealings with him.
Glad you found a solution, and sorry to hear that you had a bad experience with BH. I have had, and only heard, great stories about his business practices and the quality of his work.... He must have been having a bad day or week, or it was out of his control? He once gave me a horn for free and I have spent over an hour on the phone with him for 2 different repairs 30 mins each, multiple calls. I try to keep it short... can you imagine how many people want his time....MIND BLOWING.....Now imagine all the people who call him and english isn't their first language or when a translator is invovled?Quote:
Originally Posted by Cal Weldon
Thanks for posting the full sized page! There isn't a lot of literature on the 802-8G; this would be a good document for our library. How is the library coming, Altec Best? I'm sure with the hurricane it's the last thing on your mind right now--just wondering if a library is still in the eventual works?Quote:
Originally Posted by Alien_Shore
Exactly...........Quote:
Originally Posted by voice of the theater
Still going strong this much later. No hint of movement.
On another note: The 416's should have their new cones soon. Looking forward to playing with them.