Blue tube glow

[Sebby123]

I have a mark ivB with stock mesa tubes... on the far left power tube it glows red with a slight blue spot...
Anyways ive changed the tube and it still does it.. is this bad? should i take it to a tech or is it something not to worry about?

 

[MrMarkIII]

Google "blue tube glow". It's shockingly normal.

 

[stokes]

The blue glow is normal,but if the red glow is on the plate,that is not.If it is the plate glowing and it does it with any tube you put in that socket,there is likely a problem in the amp.Try switching the other tubes in that socket,if they redplate too,take it to a tech.