Wut? Elaborate, pls
I love speakers, in fact I design and build them as a hobby, the ones I use in a daily base are DIY...man, it's a subject I can rant for hours, there's a huge amount of missunderstanding about them...beware to unleash the nerdy beast...
I'll just leave here
the best link that I know on the matter, that site is a treasure trove of hard info
With pleasure.. Tesla was the name of local, Czechoslovakian monopoly, all the manufactures of electrical appliances and components, fused into one huge moloch. Not everything it made was obsolete crap, tho, some things made in the 50s/60s were actually quite nice. For example, the speakers were fitted into the first fender twin reverb combos.. the manufacture of speakers was halted in 2007/2008(bought by some bigger company only to be later closed), but you can still find some on ebay, but for totally ridiculous prices.

They weren't miraculous or anything, but they were cheap and relatively good, made with fine components and skillful handiwork. I think the few remaining factories(there is multitude of companies with similar names, having name Tesla in their brand name), divided in the 90s, later focused on the aforementioned components, mainly vacuum tubes.
http://www.jj-electronic.com/en/ http://www.electron-tubes.cz/en/ The slovakian triodes and pentodes aren't bad, from what i've heard.
Building your own, huh? That's awesome! I'd love to do that someday too, it's fascinating how sounds in different frequencies are spreading in different manners.. every space and every material offers different possibilities.. and how you can't let a single screw loosened, or you're left with bunch of unwanted resonance, that must whip the perfectionist out of you, right?

I have done some testing and reviewing in the past, but i'm more focused on instrument amplifiers and signal and effect processors. I like nice stuff, but i don't have to own the absolutely best stuff there is.. i mean, at one time, i was going every day past this shop with McIntosh valve amps.. and i've stopped there few times and i must agree that they sound terrific.. but at the same time, a single amp costs amount to a price of a brand new car..
Thanks for the link, i have already spend some time digging through and it is as you say, and they dude seems wicked cool. I have amassed few links to interesting sources as well, but they're mainly aimed at the signal processing, so i dunno if you'd be interested in that. In any case, here's a good site about modern (mainly pedal) compressors, with some interesting facts on the side:
http://www.ovnilab.com/faq.shtml