Hey guys. I just bought a used blues jr (made in Mexico) for 275$. I thought I did pretty good. It's super clean. Just wondering, being a first time tube amp owner (since someone stole my 64' epiphone pacemaker) if there are any basic things I need to know so I don't ruin it. (Ie: how long should you let the tubes warm up...) stuff like that. How do I know if the tubes are still good? It looks like the three on the right are groove tubes. I read about the "magic 6" starting settings and that's working pretty good. I'm running through a boss cs-2 and stock bd-2 and a 95' MIJ foto flame tele. Had a sparkle drive but returned it cos the button **** out after one gig. Also. It has some hiss at low volumes but I'm sure that's normal right? Should mention its the older model with the silver control panel (which is impossible to read btw!!) Idk. Any help would be awesome. Thanks guys. Gary.