[Amps] Matched Pairs of Tubes

[kb5gt at cableone.net]

I guess I just learned what makes a matched pair of tubes. A guy on fleabay has two 
4-250A tubes advertised as a matched pair. The ad says that only the filaments have 
been checked. I sent him/her an email asking how they were determined to be a 
matched pair if only the filaments were checked. The reply was that they both had 
the same date code, and that is what makes them a matched pair. Amazing. His/her 
user name had the word audio in it.



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