Before i play i always let my amp warm up with standby on and full power on but almost always it sounds like a fly/mosquito light is in my amp and a flock of mosquitoes is flying to there death in my amp after a while the noise subsides but i wanted to know if this is just normal activity from my tubes or do i have a problem? I also wanted to know how i should be running my cab out from my head I have a 2x12 recto cab and i just wanted to make sure.