I just purchased a Primaluna Dialogue 2 integrated amp. Stock tubes from Primaluna are 4 x KT88, 2 x 12AX7, 2 x 12AU7. I was given several sets of NOS tubes with my purchase. I am looking for some feedback / insight on these NOS tubes -- what are the advantages AND are any of these NOS tube any good (sound improvement)? Here's the list: 4 x Sylvania 6L6 / 5932, a set of Sylvania Gold Brand 5751, a set of Telefunken 12AU7, and a set of Bendix 5992.

Thanks for your thoughts.

Audio:

Primaluna Dialogue 2
Marantz SA8003
Sonus Faber Cremona Auditors
Acoustic Zen interconnects & spkr wire.