How long do tubes last and how do you preserve them?

Nov 26, 2004 at 10:48 PM Post #16 of 16
Quote:

Originally Posted by gaijin
How can you tell when there is a failure ?


Popping noises, distortion in the sound, high levels of hum or noise. mismatched R/L sound output and no sound period are the main ones. Popping is usually the tube arcing and getting ready to short. You want to get those tubes out of the amp pronto. Distortion has several causes but the tube needs to come out. Microphonics are another tube problem but they dont necessarily mean the tube is no good. A tube can be microphonic in one use and fine in another.The gain tube has a higher amplification factor and a tube thats microphonic in that application can sometimes work fine as an output tube.
 

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