Question about Seymour Duncan Sfx03 Twin Tube Classic Distortion Pedal

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Hi my seymour duncan twin tube SFX3 make a kinda radio noise with some crackling on both channels but more on the rhythm one,and its gets worst when i push the gain up. should i change the tubes? how can i fix that problem? thanks

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Sound comes and goes on the drive channel, and there is a strange crackling on the clean channel. i dont know if its the tubes, the speaker, or electronics.


Using a common lead pencil, gently tap on the smaller tubes in the unit, listening for noises and crackling to change and the drive channel changes.

It is normal to get a slight twang when doing this from the microphonics of the tubes, however, the crackling and up and down volume points to a bad tube.

Sep 03, 2010 | Fender Hot Rod Deluxe Guitar Combo...

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