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Just make sure that you only use 12ax7 types and you will be fine. Note that a lot of brands are simply relabels of valves made by other manufacturers. E.g. Mesa don't make their own valves so they are all relabelled JJ, Sovtek or Chinese valves. They may undergo more levels of screening but essentially they sound the same as their original counterparts, at much inflated prices.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
This puzzled me as well in my Bogner Manual. There are 5 pre amp tubes, the chassis labels them all as 12ax7 - except V4, which is a 12at7.
The Manual states differently
v1 12ax7
v2 ecc803
v3 12ax7B
v4 12at7 (explained above)
v5 12ax7B
Not heard of a ecc803, an ecc83, yes and wondered what the "B" was on the other 12ax7's.
The 12ax7B are Chinese Shuguang, slightly older version compared to the latest 9th generation, a pretty stock valve that breaks up early and maintains good clarity. I like the latest version better though.
Not sure what the first one is as there are no details, but the first one is the most important in terms of tone and noise, so put your best valve there. If you where to invest in just one new valve this is the one to replace.
The 12at7 is a lower gain specification of preamp valve, and some amps use them for the reverb driver so stick to the spec. It shouldn't affect the tone too much so you can leave the stock one in there unless it's giving you problems.
I think if I'd looked at my Bogner Manual closer it would have answered my question
I was still unsure if Mesa Amps recommended Mesa Tubes, but as you've pointed out they are just relabelled ones, so happy days
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
It's way past warranty