As you wish, I am a tolerable man.
Rinpoche, I think you should slow down, get that cable that you bought, listen for couple of months and then move on to linestage tube preamplifiers while being prepared to replace all the cables in your system when you choose one. Being prepared doesn't mean that you will have to but you might have to. Inserting tube preamp in the chain is not a straightforward thing. There are issues of electrical compatibility, connectors etc. That's in addition and before musical desirability. And it will not be inexpensive. Some of us spend years to build a system, especially those who don't have tens of thousands of dollars to throw around. And tube preamps have tubes, different tubes give different nuances of sound, it all should be tuned in any particular system. And if you want to save a few hundred dollars and not buy better tubes, forget about tube equipment, it is not for you then. I suggest you stop spending thousands on cables unless and until you must. This time may come when you have chosen your tube preamp. Try to be a good student, all right?