Tubes glowing.
Jan 20, 2012 at 3:54 PM Post #2 of 6
Yes it is, no worries...
 
Not glowing tubes would be a problem.
 
Jan 20, 2012 at 3:57 PM Post #4 of 6
Something normal on tube amps, usually when they get hot. 
 
When they are not glowing, thats something to be worried about. 
 
Jan 20, 2012 at 4:20 PM Post #5 of 6
Couldn't that be a redplating tube, though?  I know that's not normal and it's definitely not good.
 

 

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