This VT27 valve kit contains two ECC83S’s ( 12AX7) and two EL34II ‘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 test every valve we sell and one of the ECC83’s and the EL34 II’s are hand matched. We supply a test certificate showing the matching test results. The hand matched ECC83S should be inserted in the amp next to the EL34 output valves in the phase splitter position
Valves are made by JJ electronic in Slovakia.