My 1st pair of Linlai 6sn7 are at 75 hours. Thankfully they have lost the shrill & brittle sound. They are engaging now, with more body and more open high. The soundstage is back and there is more decay. The high frequencies are more extended, but still not as floaty as the RCA. I could live with these, even if they don't improve further.
I do wonder if the 2nd set will displace the Ken-Rad or be too much of a good thing? They have entered the country. Can't wait to hear how this pans out.
Thanks,
aldnorab