There shouldn't be any problems at all. You can Ed at CJ and he will clear it up for you.
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Many thanks guys I didn't think there should be any issues but someone told me the 7308 wouldn't work that it had too much gain or something. I think it must of been something else other then gain as I thought the output was the same in all of them but some had different heater plate current or something, I haven't heard back from Conrad Johnson yet but I did email them as well.
As a corollary to this discussion that there are in fact issues with using at least certain 7308 tubes in the amp. As per Conrad Johnson, the amp was not designed to use those tubes and would cause problems. I have tried old stock Sylvania 7308s and did indeed have problems with them. Don't know the technical cause but be careful when tube swapping. The amps calls for 6922 & 6550's which I have alternated NOS tubes with success.