Mullard ECC83 / 12AX7
Mullard made ECC83 / 12AX7 and are becoming nearly impossible to find. These tubes are praised for their smooth sound. Some tubes may be marked with the Mullard logo, by the British military as CV492 or come marked as Amperex in Amperex boxes. These all bear the Blackburn Works, UK Mullard factory codes and are the real deal. Super rare.