Nice avatar.
The TAD are typically rebrands of high grade chinese when it comes to preamps. Outside of this, and from what I know of long standing Mesa users on this board, one typically wants to re-load with Mesa branded glass. I know the Mesa bottles and pres are just the same as well - rebranded something-or-others, but it seems to be that their glass works best in their heads. Any Mesa dealer can get the tubes for you in one fell swoop.
Hope this helps.
And ya, typically, owners of tube heads can pick and choose various other tubes to make things happen differently within their amps. But to the best of my knowledge, Mesa is Mesa and needs to stay Mesa.
Cheers,
Mo