Mmcgill829 and all,
I recently received an Aric Audio Motherlode XL preamp, and an Aric Audio Transcend "Push Pull" amp.....they have only recently been installed and are breaking in. The Motherlode takes one 5U4G and two 6SN7s, the Transcend takes three 6SN7s and 4 EL34s.
The Motherlode XL preamp came with an RCA 5U4GB Tall bottle black plates, seem to be of nice quality...but obviously Aric likes them, so good with me. Additionally I spoke with Brent Jessee and he recommended the NOS 1943-1945 JAN military spec VT244 (5U4G equivalent) National Union black plates....not at all cheap at $200, but I trust Brent, so I bought it.
I had Aric upgrade to pair of NOS Sylvania 6SN7GT two rivet "Bad boy" tubes. For 6SN7s Brent recommended a matched set of the NOS 1950s 5692 JAN military spec CBS-Hytron. Here again they are not cheap at $350 for a matched pair, but I bought those as well. Damn this hobby is expensive!
Additionally I did quite a bit of research and bought some Chinese tubes as well: a matching quad PSVane EL34-PH (Philips reproduction) and matching quad of EL34-UK (Mullard reproduction) tubes. I also purchased a matching 3 tube set of Linlai E-6SN7 tubes.
I won't get around to tube rolling these in for a month or so, so can't give any impressions....other than the fact that they all seem to be well thought of for their respective categories.