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12ax7 + 12au7 strange behavior

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cl1238

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Joined 2015
I've built a 3x12ax7 + 1x12au7 preamp with tone control.
Lately, it start a strange behavior of having a constant low tick noise (sound like taping the input). I only notice it when there is no music playing.
If I swap the 12ax7 around, the noise goes away for a while. Then come back in a week or 2.
Where should I start looking?
Thanks
 
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