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Many Thanks to all, especially Gary
I just wanted to say thanks to everyone who replied to my queries and helped me out on this project. I have yet to replace the one bad diaphragm, but I just finished rebuilding the crossovers and reassembling and testing one of them, and I have to say I am impressed by the speakers - good crispy highs and decent bottom end for a relatively small enclosure with only a 12" woofer. And many thanks to Gary for throwing in that 4th knob - that was a nice gesture. It's good to find a forum with folks who are really into their hobby and willing to help out others without the BS that I see on far too many other forums, things like inflated egos and heads and constant bickering and infighting.
Anyway, I got all new L-pads after discovering mine were shot, got audio grade resistors and went with a mix of Dayton and Jantzen caps, partly because I wanted a superior quality cap and partly because those were the only ones that matched the original values. Then I replaced the cheesy spring terminals with 5-way binding posts. Also I reconfigured the inductors so they wouldn't cancel each other out, and then I put on those nice new knobs I got from Gary. I'll likely pass on getting grilles, the industrial look will work fine in the garage. I will get around to staining the new skirts to match the cabs and finish my refinishing job soon - It's kinda low priority right now, especially since I'm doing the same damn thing for work right now on a new staircase, and god knows the last thing you want to do after spending the whole day doing it is the same thing but not for pay. I can live with imperfect cosmetics for now, since they're just going in the garage, not the living room. But so far my total investment in them is about $75, and after the new diaphragm for that same additional amount, I should have a nice set of vintage speakers for $150 that will be worth significantly more than that, and more importantly, sound quite good. I can't wait to hear them both with a good quality record, it will likely make me glad I spent extra to get that nice Garrott Bros. cartridge on my digital turntable and the correct old Shibata stylus for my antique AT14SA cartridge on my other table. Since these things were made when vinyl was king, I think it's safe to assume that vinyl will have the proper sizzle to get the most from them. They seem to be real power monsters - what are others using to drive them? I'm going to use my Ramsa WP-9220 PA amp so I think I shouldn't have any problem giving them all the power they'll need, but I sure wish I still had that old Sansui receiver I had back in high school, it would probably be perfect for them.