I notice people saying that this amp or that amp comes biased cold from the factory. Why? Then those same people say to bias it hotter. Shouldn't it be biased the same way as the manufacturer does? My guess is current production tubes are crap and can't be run the way they used to? For instance, I HAVE TO bias my fryette 2/90/2 cold or tubes don't last more than 2 to 3 months max.Thats why it's been relogated to paper weight duty. Many say Fryette is awesome and Engl is bad, but my Invader 2 and ironball have always held up show after show. POS if u ask me. Always wondered. Thanks.