I noticed an odd thing at practice last week. When my amp(peavey vb-2 all tube) is in standby mode I can still get sound out of it. Although quiet and very distorted. There also seems to be a volume cutoff. If I turn the gain down on the amp it's not there at all at a certain point. Otherwise it's always the same volume from the amount of gain it takes to make the sound to all the way up. After I figured all this out I stopped doing it just in case it was bad for the amp in any way. So what I want to know is: Is this normal? And can it cause any damage to the amp/tubes?