Time for a new LD MKIII contribution
I received a pair of 6N6P-IR tubes, 1974 from the old Novosibirsk plant.
Compared to the 6N6P-I, these are politer in the treble, mids and bass are similar. I get the impression, they are a little more detailed, so you could imagine the spacial dimensions of heads and instruments better, somewhat more organized in presentation. I'd pair the 6N6P-IR rather with brighter presentation tubes than "tuby" ones like M8100 "no label, O-getter". For me, I'll keep them on my short list for system matching and the non-fatiguing signature is enjoyable, but for now the 6N6P-I will find their way back into the socket
Edited by Acapella11 - 8/13/12 at 12:35pm