Fender503 wrote:
@Aronteo

Hey I bought a SP plus 35 about 4 months ago. For some reason I get this crackling sound sometimes. I have tried turning down all of my knobs so see if I could isolate a bad tube or figure out what has been causing it. I only hear it when the amp is on and everything is plugged in. I have solid shielding on my guitar so I dont believe its coming from that. Just curious if you have experienced any issues that way with your SP35? Thank you!

Had the same thing with my SPP35, try unplugging everything, with mine it was still there.
Turned out one of the stock power tubes was faulty.

Cheers!