preamp tubes for MKIIB

[smallclone]

i just bought a MKIIB 1X12 combo and was wondering if anyone knew what kind of preamp tubes it takes. not the kind but more or less brand? or what came stock with it.

 

[Boogiebabies]

It probably came with whatever NOS 12AX7 or ECC83 Mesa could find at the time so it's highly improbable that
we can pinpoint exactly what came in it in 1981. I've seen them with Sylvania's, Philips, Tungsram (RFT) and Ei in the earlier
models. Post 1983 it's pretty much left over Ei's and then all Chinese to the later 90's.

 

[smallclone]

yeah i saw a wide variety. amperex, telefuncan, some tubes made in hungary. i wasnt sure if they were hand picked or what.