My F-1X that I got used last week is picking up some noise.  I think I narrowed it down to one of the wires that connects to the middle pronge on the volume POT.  I think it is the orange wire that connects to the circuit board that the tube plugs into, because when I touch it or come near it the noise(hiss) gets louder and I can hear what seems to be a radio station.  
Could it be a bad tube or bad connection with that wire?  I don't know.  Anybody else ever have this problem?  Any help would be much appreciated.  I need to fix this problem before Memorial day because I have a big gig.