Hey guys my prs archon 100 makes a ringy noise only in gain channel. Out of nowhere after 5-6 mths of use it has started to make the noise. I was told it might be the v2 or v3 preamp tubes so I changed it. Bought the tubes from sweetwater also bought the amp from sweetwater. It still makes noise. I also tried by directly plugging the guitar into return of fx loop it made the noise again. But while in clean channel with both loop on and off it doesn’t make any ringy noise. It just makes the ringy noise in gain channel even if i dont use the loop at all.and also it makes noise if i just use the return of fx loop. Hope this makes sense i have contacted the guys from prs but just wanted to know what you guys think. Btw i am not a tube amp pro tech or anything like that i have very little knowledge about the technicality of tubes and tube amps. Simply put i am a dummy with an amazing amp