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RE: Agree...

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The problem with ANY tube tester is the fact that tube characteristics vary considerably from tube to tube - even the same brands/types/etc.

Tubes follow the typical "bell curve" distribution model. While many tubes are near the center point and close to published spec, a good number fall at the edges of the "bell".

Finding tubes at 60 or 70% (% of what - I'm not sure what the poster meant) means only that they are, well, at 60 or 70%! They may be new, unused tubes that simply fall at the low end of the tolerance range. No tube tester, Amplitrex, Hickok, AVO, or ??, can confirm if they are new or not - only how they test.

Edits: 05/31/09

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