Here is a value Vox AC15TBX full valve kit , using JJ Electronic valves.
This valve kit contains five JJ ECC83S’s ( 12AX7), two EL84’s and a 5Y3S rectifier valve.
We test every valve we sell and ione of the ECC83’s and the EL84’s will be hand matched. The specially selected balanced ECC83S is for the phase splitter position.
We test every valve in the Vox AC15TBX Full Valve Kit on our suite of AVO testers.
You will receive a test certificate showing the matching info and the test conditions for the matched valves. Valves are made in Slovakia by JJ Electronic
One important point to note with this amp model is that some of the amps were originally fitted with Philips EL84’s . The El84’s are recessed in the chassis. The holes in the chassis were cut to suit these valves. Unfortunately, all currently manufactured EL84 are slightly wider. The actual spec for diameter of an EL84 is 22mm and they did not take account of the tolerance on the valve width. You might need to use a round file to expand the chassis hole for the EL84. If you find they do not fit, then rasp out the chassis hole with a round file. Take care not to get the metal dust in the valve sockets ! If you dont do this then you face the very expensive option of trying to find narrow matched NOS valves !