Johan Segeborn | 9 years ago

4 brands of ECC83 / 12AX7 Preamp Tubes (V1, V2) are compared in a 1977 Marshall JMP 2204 using a 2010 Gibson Les Paul Custom Black Beauty 1957 Reissue. Everything kept constant. The tubes are:

TAD ECC83/12AX7
Marshall ECC83/12AX7, likely rebranded JJ
ERA ECC83/12AX7
Audio Classic ECC83/12AX7