This Fender Blues Jr and and other 15 watt amps valve kit contains three ECC83S’s ( 12AX7) and two EL84’s.
We use our SUPERMATCH process to match one of the the ECC83S’s and the EL84’s.
We have a nice Sovtek based valve kit which uses the exact valves as originally fitted to the Fender Blues Jr
You will receive a test certificate showing the matching info. Valves are made in Slovakia by JJ Electronic