EL34 differences in air & stage depth?

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.

Mike - OK. That's great. Let your ears be your guide!
I'm a total novice on this NOS tube thing. I wanted to do the Siemens but started to get confused when I saw the differential in pricing between NOS Siemens offerings: e.g., Upscale Audio vs The Tube Store vs The Tube Depot (I think I'm right on remembering Tube Depot). As I kept searching around to try and understand what was behind the difference in price I stumbled on this "Tube Classics" site. He has some great pictures and info but what really threw me was the statement on the site, "EL34 tubes made by Telefunken in West Germany are pretty rare and Siemens and Lorenz never made any EL34 tube." I guess tubes marketed by Siemens were made by others? (Phillips and Ei)?? Anyway, it all started to seem way too complicated (especially given the pricing, the existence of fakes and me not having a clue what I was doing). So I went with current production. If you got something that sounds good to you, great...that's all that really matters.

If you are interested, the Tube Classics site can be found here:
http://www.tube-classics.de/TC/Tubes/SieTel%20EL34/EL34.htm

Pubul57 - thanks for the input. I'll check out RAMLabs.

As you no doubt know, input tubes make a bigger improvement in sound quality. First things first.

Ivanj -
Thanks for taking the time to reply. If I understand things correctly, given that the H-1 is a a different sort of hybrid design (transistor-based pre) I don't have a small tube upgrade option. I did upgrade them on the JoLida I had been running, however.