DSL 100 question

I have a Marshall DSL 100, and for the first ten minutes after turning it on it snaps and pops.
Not loud, but enough to annoy me. I know it's warming up, but should it be snapping and Popping?
I never noticed this with my Blue Voodoo. Do some tube amps just do this, or is mine broke?
My amp is only two months old.

Thanks

Check it with another cable if possible. Try it w/ another guitar as well. Sounds like it could be fuse or bad tube. Great thing about tube amps. Try switching out the tube if possible. They are usually warrantied for at least 90 days. If its none of those, could be transformer. Good luck.