Replacement power transformer built to vintage specs withg correct interleave ratios and lots of iron. Perfect upgrade for later and re-issue Marshalls. Great replacement for many other vintage British amp. High quality - classic sound.Specs:Primary: 0 - 120 - 230 - 240 voltSecondary 1: 350 volt 290mA with center tapSecondary 2: 6,3 volt 7 ampere with center tapMADE IN USA