When to replace pre-amp tube?

Hi, I'm a tube dummy and want to know when would I need to replace the tubes on my MF Nu-vista M3 integrated amp. Thanks.

thuhaile08-25-2011 7:27pm

dekay Details Discussions Posts This discussion Message User 5,690 posts 08-26-2011 at 02:21am Copy Comment URL Report Comment Edit Delete When marketing the amplifier, as far as I recall, MF stated they were good for 100,000 hours and that they would "reserve" a replacement tube set for every unit produced. That was then and I don't know what the now position is.