My amp is dead

uh my hd-130 amp just started to get really distorted at a low setting and just cut out completly. if i turn it back on after about an hour of rest it works for a minitue and cuts out again. is this just my tubes blowing or somthing more serious?

It could be tube related or it could just as easily be power supply related.
Has this amp ever had a cap job? Does it ever blow fuses? Do the tubes glow red?

It has never had a cap job. I blew a fuse once but that was because the power went out. but the tubes light up normally