Is it just 1 red light next to a particular tube or are all the red lights on next to all the tubes on the right side of the unit.If it is only 1 red light next to a specific tube, turn off amp then remove that tube and also remove 1 of the other same size tubes and switch their places if the red light follows the original tube then that tube is bad.If the red light stays on in the same place after switching tubes then either the socket is damaged or there could also be a problem with a bad connection wire inside.I cannot see the amp getting damaged in transit since it is triple boxed, if the boxes were not damaged when you received the amp then it is most likely one of the above causes.
Straight out of the box doesn't work.
Just received my new Prima Luna EVO 400. Heavy thing, looks good. Took the foam off the tubes, only on the power tubes. Nothing on the small tubes. I'm new at this, don't know what they are called. I did notice some of the tubes were a little crooked so I seated them in a little better. However ( you new that was coming) two of the small tubes on the right kind of wooble. Did I spell that right? What the hell plugged in and red light on the right side. It doesn't work right out of the box. Going back tomorrow. Just wanted to let ya know. Going to go through the recommendations again. Good night.