I'm replacing the tubes in an Ampeg-SVT-CL. I purchased this some time ago and never replaced the tubes. The sound just isn't there any more, no high end or mid-range and just a muddy bottom end. When I pulled out the guts there are stickers on top of the tubes that say 04. Is this 2004? Have I been running these tubes for 10 years?!!? I noticed the tube retainers have some almost like baking soda buildup on them. What should I clean this off with? I have some military grade corrosion spray for electronics. Do I need to avoid oil, fingerprints, etc on the new tubes?