I bought one of these years ago and my compressor search ended. Mine came used for a couple of bucks because the tube was spent/faulty and I thought it would be a good project. So it turned out that Effectrode offered warranty but shipping was ridiculous so for 10 bucks I got the spec'd tube from Tubedepot and after 15 min the compressor was as good as new. Now I am starting to hear some of that soft crackling on note decay and beginning to think it's time for a new tube, ..again. For those of you with one of these units, have you had to deal with replacing the tube, how often? Is it weird to have it go after 4-5 years?