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Hi Hal, That's no problem. Very carefully take a 1 inch putty knife and some rags and scrape up that gorpy glue. You want to be careful to not bring up any of the particle board. Fill the old holes with some silicone caulking and scrape them flat with your putty knife once the black gorpy stuff is cleaned up. Get a roll of Mortite at the hardware store.It's like modeling clay on a string. It comes in a big roll and is used to fill cracks in old wooden windows and can be pulled out for the summer. It's the easiest way to make a uniform woofer gasket that does not harden and does not get goopy. When you put your woofer back in note where the old holes were and move the woofer over 1/2 an inch....remember to make new pilot holes smaller than the screws diameter. Protect that woofer from any slips of your hand! I know from experience. I noticed that little point of crumbled particle board. One pair I fixed looked exactly like yours I put a Mortite gasket in an just kept it abutted against the woofers edge around the routed edge of the woofer cabinet hole.When your screws are in place it will be air tight I did the same with the tweeter. Don't over tighten the screws,the gasket does a job of holding too. The Mortite doesn't even squeeze out,it was made for Dyna it seems. I saved 2 different Dynaco woofer gaskets. They were a cheap way out,foam, and are as thin as a piece of paper. I forgot wipe the black crap off the woofer frame too. When your done you will have a better Dynaco A-25 than before,,,,,Mark.
Some earlier A-25's used a ScanSpeak woofer,
What I know about the A25:I enjoyed mine very much for the ~9-10 years I used them.The A25 had the simplest crossover imaginable (a single capacitor in series with the tweeter to keep the low frequencies out), probably one reason it was renowned for its transient response. Crossover was a relatively low 1500 Hz. The aperiodic tuning gave it very tight,articulate bass and a smooth impedance curve that made it an easy load for an amp. The bass tuning was accomplished by feeding it a low frequency square wave and adjusting the amount of stuffing in the port while observing the woofer output on an oscilloscope.The later A25XL had a slightly more complex crosseover, a slightly smaller tweeter and about 3dB higher sensitivity.I don't know where Wayner is but he is also a good resource for A25 know-how. He built beautiful replacement cabs for his. That's who I'd reacjh out to for advice. His A25 pictures are gone (below are a couple I saved) and maybe he is too but Frank Van Alstine might know how to reach him.
Seas A26 10" 2-way Kit
Hey! Man! Those are pretty. I don't mind the look of those tweeters. I've never heard them. But I think the key of these speakers is that those woofers are running full range and naturally rolled off just a right point and steep enough for the tweeters to come in, so no need for the crossover for the woofer. I love the design of these speaker. Anyway, here's a modern day A25, the Seas A26 kit.https://www.madisoundspeakerstore.com/2-way-speaker-kits/seas-a26-10-2-way-kit-pair-based-on-the-classic-a25/Buddy
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