Strange intermittent noise from valve

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Curlycat

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One of my favorite valves makes an intermittent noise. It's going to be hard to describe what it sounds like. Almost like a screech, a bit of a pop, screech again. Almost like the sound you get when your record has finished playing and the needle is stuck in the end grooves of the record.

Should I be concerned about this? Can it cause damage to my amp if the valve is busy failing?
 
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