tube noise coming right from the tube

Hi, I recently got a decware zen triode amp (tried to ask in the decware forum but it won't let me register) The big tube seems to be making a ringing type noise that I can hear when the music is off at first I thought it was coming out of the speakers but it's right from the tube.  It's not super loud but I can easily hear it when the music is not playing.  Would this be considered normal?  Anything that can be done about it, maybe those tube rings I've seen.  It's the rectifier tube also maybe worth noting that tube seemed to not be working at all when I first tried to power up the amp.  IT didn't light up and no sound from he amp.  I wiggled it out and put back in and then it worked on the second try.