So I've replaced all power and preamp stock tubes in my Triple Recto with JJs(E34L and ECC83S). I get a lot of disruptive noise(could be described as a light wind-blowing sound mixed in with some crackling). After trying different combinations, I see the problem is coming from the preamp tubes. Thing is, I cannot seem to isolate the problem to one tube! I swap V2 and V3(where I suspect the problem is coming from)with all JJs, but ALL seem to cause noise. If I put the replaced tubes back in, the noise is not there. Are all five tubes possibly defective, or am I missing something here?