Hi Sony VFET experts , I need help determing the rank of 3 vintage Sony VFETs found inside a part unit of a high end vintage Sony VFET amp the VFET is shown in the pic, your kind help will be greatly appreciated ! Thanks! And a very happy new year!🙂 the 3 VFETs are all marked SONY 2SK60 A580, I could not find any info as to what rank they might be .
