Because you will never understand then what your Lampi can achieve. Just like you wouldn't know what your spreakers are capable of until you heard them with various amps. Or what your TT is capable of until you listen to it with different combinations of carts and arms and phonos. Of course, certain things are difficult to change, such as changing your room for your speakers. But optimizjng a Lampi is one of the easiest things you can do due to the space and budget required. But you have to know first what are the different sonic levels it can achieve based on matching of valves and downstream electronics.
So when I say that I like Tak 300Bs better than PX25s I am wrong?