So I thought I would follow-up. I thought the amp I ordered was new old stock turns out it was b-stock which may just be a fancy name for used or really old floor model. It looks mint and still had the tags on it so my mistake.
I opened up my mark v 25 and stole 5 of the 6 pre amp tubes and swapped out 5 of them v2 through v6 and it still squealed like crazy. I started to think I got a lemon and put all of the original tubes back in it but in a random order. I decided to take a chance anyways because the amp looks so mint and ordered a complete set of JJ high gain from eurotubes but they wont be here for a week.
The thought of spending 1200 bucks on a lemon was eating at me so I decided to see if I had any other tubes laying around. I found a little baggy with 1 JJ, 1 chinese tube and 1 Gold Pin Electro harmonix tube from years ago. I took the head out of the chassis and set it on top of my 4x12. I first tried the Gold pin in V1, no luck. I then moved it to v2, no luck, then v3....no luck. I started thinking maybe its 2 bad tubes so I added the chinese tube to v2....no luck. I had one last shot so I tried the JJ in v3 and BAM! It now sounds awesome and I can use all of the gain (not that I would) without squealing.
I noticed the year signed inside in from 2010 and I can only assume these are the original tubes from 2010. I think I will go ahead and just put the complete new JJ set in when they arrive for piece of mind.