I've been compiling a list of the different dual triode 12A*7 preamp tubes and the different versions for use for pro-audio equipment: specifically for mics, micpres and compressors. Of course I screw around with occasional guitar amp as well...
Since 1947, with the introduction of the 12AX7 vacuum tube, there have been lots of interesting variations that can be tried in tube preamp circuits. This list is by no means complete but will provide some quality alternatives to the "Sovtek, Ruby or EH" tube choice that guitar center has.
Most of the below tube types spec close enough to be drop-in replacements (with circuit specification, a certain Mu value tube will be more in focus than other Mu value tubes) but a quick looks at the data sheets is always a good idea for specific biasing, etc..:
Tube Types
Gain (mu) 19
12au7
ECC82
E82CC
ECC802S
5814A
6189
13D5 (brimar)
CV4003 (Mullard)
M8136 (Mullard)
Gain (mu) 41
12av7
Gain (mu) 45
12ay7
6072
7062 (48)
5965 (48)
Gain (mu) 60
12at7
CV455
CV4024
ECC81
6201
E180CC
E81CC
ECC801S
Gain (mu) 70
5751
Gain (mu) 100
12ax7
12ax7a
12ax7WA
12ad7
12dt7
12df7
7025
7729
ECC83
ECC803S
E83CC
CV4004
Some of my favorite are the cleartop Black plate RCA's, Telefunken, Amperex (especially the PQ series), Mullard, GE 5-star, and NOS JAN (joint army/navy- military spec) tubes will be of significant quality. Brimar is still a sleeper...
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