I could be wrong, but I thought nuvistors were only available from Musical Fidelity. I thought they kept a certain number around for repairs, and nothing else.
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I'm pretty sure that MF held back a backup pair for each unit produced and the US importer or manufacturer should be able to help with procuring them. I would be surprised that they would be needed anytime soon though, I thought the life span was in the tens of thousands of hours? Also I'm pretty sure you can sometimes find folks selling nuvistors on Ebay, perhaps NOS backups could be procured more easily there? Good luck!