EL34 differences in air & stage depth?


I've been searching the threads trying to learn about differences between different EL34 tube offerings. Most comments seem directed at tonal qualities. I'm curious if any have compared and found differences in "air" and stage depth. My system is posted. The H-1 appears to come with Shuguang EL34s. It does many things well but I'd like a little more openess in the presentation. Possibly this means more mid-range forwardness and/or greater high end extension. Thinking about "tube rolling" (KT77s as well as EL34s). Any suggestions would be very much appreciated. Thanks in advance for your input.
128x128ghosthouse
Mike -
Exactly which Siemens EL34 did you get? There appear to be various "NOS Siemens EL34s" out there depending on (if nothing else) year of manufacture.

Glad they are working for you.

CA
These were apparently made in the 70's. Not sure how I would verify that. For all I know they are chinese fakes (but I hope not!). I do know they really seem to have changed the sound--even over the SED Winged C's.
Mike - wasn't trying to plant any seeds of doubt! If you don't mind, who did you buy them from? Thanks.
No, no Ghosthouse, you didn't do that. I was really just referring to my own naivety. Got them on eBay (of course) from a guy in England. He has an eBay store -- search for Langrex. If you can tell me more about the tubes, that would be great.
RAM Labs (Roger Modjeski) sells Siemens EL34s as well. Use them in my Music Reference RM9SE.