The JJ ECC83MG is a "Mid Gain” 12AX7 type tube. It utilizes a medium length ribbed plate design that is much like the old Amperex and Brimar European designs. The ECC83MG has a fair amount of harmonic density but remains very open sounding whether played clean or overdriven. Tonally it fits nicely between the JJ ECC83S and JJ ECC803S. Also available with current Balanced triodes for phase inverter use and Balanced and Matched in pairs or multiples.