Woo Audio Amp Owner Unite
Aug 8, 2013 at 10:59 AM Post #26,956 of 42,298
 
I got news that the tubes all had black spots so I cancelled the order. Sorry
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What do black spots mean?
 
Aug 8, 2013 at 3:13 PM Post #26,959 of 42,298
Quote:
 
What do black spots mean?

 
Quote:

 
Quote from a website:
 
Some of the things to look for that indicates that tubes have been used are burn marks, which may appear as dark spots on the silver part of the glass tube, called the "flashing" of the tube. The tube’s flashing is the first place to look for signs of use
 

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