What scually makes the hiss is it the preamp or the poweramp?
Mesa Boogie Tremoverb And Recto cab
Peavey 5150 and cab
Peavey classic 2 12
Agile Intercepor pro 7
Jackson soloist sls
Jackson RR3
Ibanez 7321
Washburn Dimebolt 333
If its a good amp...neither really. Usually instrument cables, pickups, the electrical outlet the amp is plugged into...etc.