Hello there, 
 
I went and got myself an ART Tube MP Studio V3 preamp fairly cheap off the net and am wondering if I got a dud? 
 
My problem is the noise it makes. I've read a lot of reviews and obviously noise came up a lot. I wasn't expecting anything like top or even mid range quality from a cheap unit like this but I was hoping it would be usable! 
 
Here's my experience with it: 
 
I am plugging the unit into a small 25w peavey guitar amp without anything plugged into the V3's input. 
 
If I set both the input and output levels midway (12 o'clock) without its +20db button pressed in there is a small amount of hiss present with an occasional rustling noise creeping in.  
 
If I then switch the +20db pad on, the hiss becomes extreme. In fact, with +20db turned on, you cannot raise the output level above the first indicator without the unit becoming unusable due to it's hiss. 
 
Is this normal for the Studio V3? Have I got a dud? Is the valve dead (it doesn't seem to glow at all and I'm not sure whether I should expect it to?)? 
 
If anyone here owns one and will admit to it(!) I'd love to hear whether this is normal behaviour or if i need to return it. 
 
Thanks in advance...