Where would one go to to test old tubes to see if they are still good?

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Nick Athanasatos

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I have the Sylvania STR415 6L6 tubes that came with the MkIIC I got from original owner.He changed them with new 6L6 Boogie Tubes from the Mesa Boogie store in California I think, he said figuring they were old and needed changing.
What's the story with these old tubes on eBay labeled as refurbished ?
And where would one buy a new set of those Sylvania Tubes from a reliable place ?
And what would a matched set of 4 cost ? Thanks
 

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