This JJ kit has one ECC81 ( 12AT7), four ECC83S’s (12AX7) and two EL34 II’s.
Note that our JJ EL34 kits use the much improved JJ EL34II because it has vastly richer mid tones than the cheaper JJ EL34. The standard JJ EL34 has a reputation for sounding thin and JJ made the EL34 II to address this tone issue.
We use our SUPERMATCH process to match the ECC81 and the EL34’s. We supply a test certificate showing the matching test results. . The hand matched ECC81 should be placed in the phase splitter position next to the EL34 output valves.