Waaaaait for iiiiiiit...Tiptop should have the Euro Buchla 200's version of the Model 266 SOU in a matter of months, for a reasonable price that's rather non-Buchla-ish. Given that the Source of Uncertainty is something of the "gold standard" for random signals, having that for randomness seems to me to be a real opportunity to experience something historical AND useful, to say nothing of it being built to Buchla standards.