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7JP4 Tube Grading

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03-16-2015, 07:48 PM

Polaraligned Polaraligned is offline

VideoKarma Member

Join Date: Mar 2014

Location: Apex, NC

Posts: 203

7JP4 Tube Grading

So I have seen "A" grade before and I just figured that it was a good tube in nice working condition. Someone is selling a "C" grade tube that he says is a good working tube. So this has me thinking- what the heck criteria is the grading based on? And how does one determine the grade? it sounds like it may be a bit subjective.

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