Aguaa, re: the 25/35s,
They're not tough to pop open for rehabilitation. Just takes a little time and patience. A small pen-knife will pry the grilles off of their Velcro supports. If while doing so you encounter resistance around the "Dynaco" badges you'll need to unscrew them. I believe the later-model speakers had threaded badges that dug into the wood, as opposed to the early ones, which were just stuck onto the grille cloth.
Once you've got the grille off, back out the Phillips-head screws holding the woofer down. Then take a very fine chisel to the woofer basket and very gently start prying it out, tapping around the bevel a few times. This might be a good time for a shot of scotch or a decent Bordeaux, pray, or whatever. Here you've got to be careful because you don't want to damage the woofer surround or the MDF (a.k.a. particle board). Just keep worrying that puppy until it comes loose.
Snip the power leads to the woofer if they're soldered on, otherwise just unhook them.
And there, Behold, is the cross-over. Simple and elegant. Un-solder the ancient capacitor and replace it with a new $10 one of the same value, I think 5 or 6 or 7uF, 200-300V rating. Squirt a little Deoxit on the selector switch while you've got everything busted open and spin that baby a couple of times.
Acquire a tube of very cheap poly or vinyl caulk, apply a bead around the bevel where the basket sits. Oh yeah, you should reconnect the woof before doing that. Set the woof back in, return the screws to their holes unless you've buggered them up, in which case you'll have to drill new holes (MDF is cranky that way), and after overnight drying time, you should be in business. Give the new capacitors a month or two to settle in and enjoy your brand-new second-hand A-25s.