I've had a problem develop with my Eden WT800. On low notes I was getting a pop now and then, sort of sounding like if ya yank a cord out with the amp on. Did a Google search which brought me right here. Read up and figured I'd try and replace the pre amp tube as others described the same problem and done the tube fix. Worked! Local shop had the tube and I am back in pop-free business. Time about 30 minutes total including replacing the tube. Cost $14.95! The alternative would have been a 40 minute drive and leave my amp with the shop for 2 weeks and fat bill. Happy Man! Thanks Talk Bass.com!