I just received my JP2C today and was enjoying the sounds for the first half hour or so then the thing made a loud gunshot pop that scared the hell out of me. It seems to sound fine after and it didn’t do it again for the next half hour I played. I read the startup instructions thankfully and found the power tubes hanging down a bit from shipping but I seated them before I started playing. Hopefully it’s nothing. Maybe a tube anomaly but I’m a little nervous about it. Any reply is greatly appreciated. Any idea what may have caused this