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Popping/Crackling in DT25 even after tube replacement and biasing


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I got my DT25 tubes replaced (both preamp and power) with the following tubes below, earlier this week. I confirmed that Line 6 recommends these tubes. The tech had also biased the amp post replacement.


However, the amp is making crackling noises in Class A/B mode but NOT in Class A.



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Wondered that myself, but it only occurs with hummers.

If it was the cable I would expect it pop and crackle on both hummer and single coil. 


Unless there's something odd with the cable ground, that it would only occur with the humbuckers.


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