understood. with the cronus magnum you most likely will never roll the power tubes because the KT120s are only made by tung sol and they are impressive enough. you would just be left with the small signal tubes, and that can be a fun proposition swapping various combos of 12AX7 and 12AU7 as the system evolves. the clarity and transparency and sound stage of a tube amp is worth the price of admission if you ever get the opportunity. enjoy the hint, it's a great amp!