Anyone with technical knowledge RE: ADS L1290

First off, you have the series 2 speakers. The series 1 did not have the internal fuses.
Try swapping the tweeter with the other speaker's tweeter. The problem may be in the crossover circuit board, but could be in the tweeter. If you find the tweeter is indeed bad, you can get it fixed by contacting Richard So at ads_speakers@yahoo.com. He can fix yours or sell you a new one. Good guy to deal with.
Lastly, you have a great speaker. I have both the 1290/2 and 1590/2 and wouldn't part with them for anything!

Hello Sid42

Since I am not much of a speaker tech, and interested in following this advice, can you or anyone tell me or direct me to any written procedure to remove the tweeters?

I will assume that I would remove the screws and pull the tweeter forward, out. Do the internal tweeter wires need to be cut or is there a blade connector of some type? If no connect exists and wires must be cut, what is the best way to reconnect?

Also, before removing, would it make any sense to use a VOM to test continuity from the speaker terminals to the tweeter?

I really appreciate everyones assistance.

The tweeters are easy to remove, and you are right you do have to remove the screws. Be VERY careful when removing NOT to tear up the gasket behind the speaker. Also, pry it off witha knife blade or small scredriver, but put something on the wood where you are prying so as not to damage the wood surface. Tweeter/midrange aren't bad, woofers are tougher.
Once removed, there are plug-in connections, so you do not have to cut wires.
I'm not too electrically minded, so I don't know if continuity is what you need to do. Myself, as I said earlier, I would just swap the tweeter on your other speaker.
Let me know what you find out as to the cause of your problem.
Alan

In thinking about your problem, look on the back or bottom of the speaker and verify you do indeed have the series 2 model. It will say "1290/2". If it is the series 1, you do have fuses, and your fix may be as simple as replacing a fuse.

It looks like I will be swapping tweeters. My speaker ismodel 1290/2 SN#16214

I found some other postings on the web where someone actually has a ADS parts list scanned and uploaded from 1992.

The 1290/2 tweeters are part number 206-0117. Interestingly the L990 (which I own), L880/1 and /2, L780/1 and /2 all use this same tweeter. I don't want to cannibalize my L990s...maybe I can find a set of these other speakers and use them for parts?

I will attempt to remove the tweeter tomorrow and I am hoping it will be something as simple as a loose wire (yes, unlikely, I know).

I don't know a thing about the VOM. This was a suggestion I received from another kind soul, so i may hit Radio Shack after all the black friday chaos and see what they say.

Thanks for the advice on removing the speaker. i am going to buy a new putty knife to protech the wood should I have to pry the tweeter out. I alsohave the cap/cover for the midrange so i can protect that as well.

Happy Thanksgiving to you all!