Melz1578 arrived.
Wow.
They are extremely good, i think even better than BrimarCV1988 or the TungSol i own. They are astonishing when it comes to detail, soundstage, imaging, blackness of background. While they are hyper detailed, they are not sacrificing musicality and natural timbre. They are not overly warm or lush, but in no way harsh, peaky, grainy, whatever term you might use for a bad midrange or treble. The bass is also exceptional, so much punch and dynamics. Combined with the MO's, the Susvara reached a new high. That being said, they are probably not the tubes that will help the 1266 achieve a sweet midrange. Oh, and they are completely silent.
After half an hour of listening, i messaged the guy i bought them from, because he has two more pairs of them, i will buy a back-up pair, the price is very attractive and the availability of those will certainly not get better.
Just imagine tubes like those new stock from a big reputable manufacturer with a warranty.
SPEAKING OF TUBES, i may or may not have gone for the_big_purchase in the end after all.
Man, i love tubes. This is one more time where i just sit in awe starring in the air while listening to music.