Glenn, to me all these expensive & rare tubes are not worth the money, unless you are a collector or crazy like me.
When I did some extensive tests I found out that similar tubes of different production did sound different.
That was based on Sylvania 6SN7W's and Mullard Ecc33's.
Then again I get all my listening pleasure from cheap tubes GR Super 10 on 6BL7's.
Thanks John, you are ever so right!!!!!!!!!!!!!!
Clayton stop it please, It's past lunch time and I can't look at these nice dishes............or else I'll have another late lunch