yes my jcm900 cab has g12t-75's too ,and i hear nothing but great things about these speakers ,and that they r yngwie malmsteen's favorite speakers ,i plan on keeping mine also but part of me starting up my guitar hobby again is experimenting with different speakers . whoa ! what is that? lemme guess 1960's?what are the specs in that monster? like what type speakers ,what kind of tubes ,what are the cabs and head called and what year are they from?