Mesa 400+ fuse blower

[thessandman]

I just got this (used) and love it. Last week I had 4 gigs in 3 days. Thurs and Fri night was great, Sat. A.M. the fuse blew.Sent ti to my amp guy, He couldn't find anything wrong with it. Said the fuse must have been bad. Get ti home, and blow another fuse, right off the bat. Both times the amp was cold. I haven't been able to make it blow again, but I'm scared to gig with it. I called Mesa and they were sure it is a bad tube, they told me to tap the tubes----nothing. Any ideas?

 

[KojakCurtis]

Are you letting the tubes warm up long enough before you start playing? My general rule of thumb is to let the tubes warm up for about 10 min. before flipping the standby switch and goin' to town.

 

[thessandman]

No, I didn't. Would that be enough to blow an 8 amp fuse?