my buddy jrod over at FSB turned me on to this killer vintage Russian guitar and effects site. click on the title, and you get a babelfish translated version of the site. i've barely gotten into it, but it looks like it's filled with some freaky psychedelic machines and cold war rock and roll ingenuity. check it out!
he also found on the same site, a different version of the KAZAN BOOSTER that was featured in one of the first posts on APOCALYPSE AUDIO. the difference with this one is that there are diodes sprinkled around in the signal path, which is a rather odd design technique. the only other place i've seen something similar is in Joe Gagan's Vulcan distortion. this can be found in the ANALOG ALCHEMY LINK on the right of the page. he described it as a sort of limiter to prevent hard saturation of the transistors. it sounds like a neat little trick- i might have to give it a shot sometime.