edwardre Posted October 7, 2002 Share Posted October 7, 2002 What does it mean when the metallic silverish 'cap' part of the tube is virtually gone? Or, more to the point, what is it and why do tubes have this 'inner glass coloration'? One of the tubes in my preamp has just a few specs of this left....it's virtually clear up there. Bald looking. Seems to work fine. Swapping it with the other channel's tube has no effect (that I can tell) on the sound. Should I start looking for a replacement? Is this tube starting to die? Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted October 7, 2002 Share Posted October 7, 2002 Ed, There's a device inside a tube called a "getter" that is flashed somehow to burn up the last part of the air inside the tube when it's made. That makes the discoloration you see. I don't think the amount of discoloration you see is predictable and is different from tube to tube. It's normal, don't worry about it! Al K. Quote Link to comment Share on other sites More sharing options...
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