i just put new tubes in my ENGL SE (KT77s in the power section and the pre section is 1 tung sol, followed by 2 JJECC83s followed by 2 9th Gen Chinese. it seems my amp is much much noisier now. is it because there is a bad tube or is it just the gain level of the tubes. i plan to get a noise gate so i just want to be sure i didnt do something wrong or there isnt a faulty tube