Thank for the reply Jamie - that sounds like a really nice cap combo you're running in your crack! Wish I could easily jump the pond and arrange to meet up and give her a listen.
The issue of the proper orientation of non-polarized caps has me a bit confused. I read up a bit on it before putting mine in, and per http://bottlehead.com/smf/index.php?topic=2366.0 and a few other sources I stumbled on, the general advice seems to be that you should connect the "outside foil" lead of a non-polarized coupling cap to the plate of the tube. I also read that the outside foil lead is often, but not always, the short one (see, e.g: http://www.v-cap.com/installation-notes.php). I couldn't find anything confirming this holds true for the RTI's - so I just guessed, perhaps incorrectly. I think I may call Tyler or even RTI directly and see if I can get some confirmation on which lead goes to the inner vs. outer foil. PJ spells out a way of testing this in the thread linked above, but I'm not sure exactly how one goes about "putting some ac across the cap."
For safety, I should really pick up some appropriately sized sleeves for the leads anyways - so I'm not at all opposed to uninstalling and reversing them.
Edit - just spoke with Tyler (really a nice guy), and he confirmed that Jamie has the right of it. He did test the caps on his scope, and the long lead is the outside foil (opposite of vcaps). Tyler explained there's no harm in running them backwards, but you can get slightly better noise performance the other way around. Thanks again for calling this to my attention Jamie!
Edited by skeptic - 3/19/14 at 10:46am