Stiletto Duce Noise

[edderkoppen]

Hey guys, I have a Mesa Boogie Stiletto Duce, after I have been playing it for about half an hour it starts to make a LOT of noise, like really loud hum or hiss. Can it be the pre amp or power amp tubes that needs to be changed ?
Thanks

[J M Fahey]

Hum or hiss not the same.
Can you post an MP3?
Does it respond to any control?
Post the schematic.

[edderkoppen]

Well, after 20 to 30 minutes where it sounds killer - as it normally does, noise(like if I added an extreme amount of distortion) appears. So even though I did not touch the gain - I try to turn it down, but this does not reduce the noise, only the natural gain

[J M Fahey]

Does *any* control affect it?
Move *every* pot and switch.