4 years of heavy gigging ,weather changes ,dropping my amp from 6ft high the mesa original stock tubes have done the job . i hear all you guys putting this tube and that tube in your amps,can i really do much better ? pros cons? i get a killer sound from mesa tubes just cant imagine getting much better and the worry of using non mesa tubes in the set bias amp .can you convince me to change ? im getting some slight buzz now after 4 years and some minor deggression in the balls sound from the first 2 years ,i know they recommend every year but never had a issue ,but now i know its time 259.50 is alot of money for tubes i know but i think mesa is the smart and safe way to go . let me know guys if you think im wrong ,thanks cc