I think the tube in my Eden head might need replaced. Sometimes it sounds like the bass is effected when I'm not using my effects pedals. Plus, the tone just doesn't sound quite as clean as it used to. Does this sound like a tube problem? If so, a rep at Tube Depot recommended the Electro-Harmonix 12AX7 for a good value (good tone without spending an arm and a leg). Would anybody recommend a different tube? Should I stick with an Eden tube? Here's a link to more 12AX7 tubes at Tube Depot. http://www.tubedepot.com/12ax7.html I appreciate the help!