Groove tubes are just rebranded tubes by other people (they "test" them and put their own name on them). You could most likely find the one I linked rebranded by them, it is a high gain 12AX7 with smooth high end character.
12AX7, 7025 (US marking) and ECC83, ECC803 are European markings all pretty much the same tubes that vary in sound by manufacturer.
If you print out a pic of the one I linked you will most likely find a GT that is that tube. What comes after the tube type (like 12AX7, ECC83) is at the tube maker's or re-brander's discretion.
Just call me B-String 2
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