Straight out of the box doesn't work.

I don't know how the 400 works, but on my 100, a red light will come on when powering it and will stay on for a full minute, then will turn green, meaning it's ready to use. It is clearly described in the owner's manual. Hopefully that's all it is. 

The unit should work. Period. YOU shouldn’t be apologizing for a malfunctioning unit. Seller should be apologizing.

  @bpoletti 
  +1

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.

@mc,

Give the "Made in China" a rest already.