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This fuse (power section) keep burning on my amp.
I had to change the power tube and that fuse last week.

Everything is back to normal, but that fuse burned again... any idea?

"To check the fuses, use an Ohmmeter to make sure they're blown because sometimes you can't see if
they are. Amps shipped after August 2007 with serial number xx7096 or higher have one main fuse
type 5x20mm slow blow. To remove the fuse you need to pull the black panel up from the left side and it
opens like a door and then you need to pull out the red insert which holds the fuse. A little screwdriver
comes in handy. Previous Duendes had two main fuses, type: 5x20mm slow blow, both of them need
to be good in order for the Amp to work. They are located between the power cable connector and the
power switch."

Did you ask your amp tech?

The fuse is blowing to protect something. Better to burn out a fuse than a tube. Hopefully you won't have to replace any more tubes.

Most of the time power tubes should be replaced in pairs, preferably matching. If one of the pair was bad, there's a good chance the other one is on its way out too.

They been replaced in pair and bias too.
We'll see, maybe the fuse got damaged... I changed it.
If it blow again, the amp will see a tech (again).

Yeah I would take it to a tech.