Posted the dsl thread last week or so after I joined. I mentioned I just got the 40cr. Had it over a week now and getting adjusted but it has this constant white noise hiss. I leave the masters cranked and adjust the volume form there. It’s more pronounced on the red channels. Regardless you turn each channel volume up about 1/4th if the way and it’s there in either 20 or 40 watt mode. I contacted sweetwater where I purchased it from (awesome customer service btw). I Tried some different trouble shooting techniques. Different rooms, I’ve had it at a buddy’s house and it did it there as well. Leaving the guitar un plugged and just turning the amp on, that made it worse. Plugging the guitar directly into the effects loop return, that helped somewhat but didn’t resolve the issue. Long story short they’re sending me a new pre amp tube to swap around. I’m still learning and I’m no amp mechanic, hopefully this will be a smooth process to figure out. I’m sure they will make it right in the end. Just sucks to spend that kind of money and have issues pretty much out the gate. I’ll keep y’all posted.