I recently purchased an Egnater Rebel 20 from eBay, upon receiving It i plugged it in and flipped it on and was greeted by some lovely static noise. As the amp warmed up, the static fades. I am pretty inept when it comes to amp, but wanted to hear from experienced individuals on what may be causing this. Here is a link to the youTube video that demonstrates my issue... https://www.youtube.com/watch?v=w7k1V2yh8yY I did go ahead and open up the back to see if any of the tubes had been loosened during shipping, I reseated them all and it still has the same issue. I was surprised to find the EL84's are chinese made tube, and I am pretty sure that these are not stock to the amp. Any help or recommendations would be greatly appreciated. Thanks for your time!