I picked up a new '68 Custom Vibrolux Reverb yesterday. This amp rocks and is quite versatile. I really love the tone! However, there is a white noise hiss that is audible even without anything plugged into the input once the volume is up to 5 or so. It's not noticeable when playing, but it's definitely there when the guitar is quiet. Here is what I've observed so far... The hiss on the Custom "Bassman" channel is quite a bit louder than on the Vintage Channel, but it's there on both channels. The Custom channel is hotter, so I guess this makes sense. The reverb/trem seems to have nothing to do with the hiss because it doesn't change when 'verb/trem are turned on or off. The noise is worse the higher the volume is. I checked each tube one at a time. When I removed V1 on the Custom channel, the noise was completely gone. Same with V3. In fact, I couldn't even tell the amp was on when I pulled either of these tubes. Questions: Is it possible the amp came with two bad tubes and that replacing them would improve the sound? I have an extra 12ax7 that I'm gonna try tonight. Does this sound more like a lead dress issue? Besides the tubes, what are some simple things for me to try? I really don't want to ship the amp back without knowing I'll get one that doesn't hiss... especially if it's a simple fix. Also, I can have an authorized amp service look it over, but the closest one is two hours away and they'll need the amp for multiple days. Before I do that, I wanna make sure I cover my bases. Thanks.