I picked up a set of tubes made by NATIONAL in france. Are these the
same As amperex? Also As the national tubes were made a good bit before
the amperex I'm running in my Henry 2k (the ones in the amp have about
20 hours on them) should I put the nationals in or do these tubes age
much when not in use? Can anyone tell me which numbers are the date
codes and how to read them? stan
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