OK, so my Orange amp takes maybe 30 seconds to warmup before it starts passing sound. I usually put it on standby, strum a few bars, tune the guitar, and then flip it over to "on" and I'm good. If you flip it to on instantly it won't make much sound initially. I am just curious though, to me it sounds like the sound is off a little for 5-10 minutes until the amp actually feels warm to the touch on the top. Anyone else notice anything like this? Am I imagining it? I would say the sound is kind of "thin" and almost has a tremolo type thing going on which goes away after a few minutes? I'm obviously warming up at the same time. Note it's taken me a long time to notice this.. I'm not talking about anything major.