Tube options for Jolida

After trying various NOS Philips-Psvane-Tung Sol-"preferred" etc. 12AX7s in my Jolida power amp (factory modded 502P), I finally bought a matched and balanced pair of Russian (as opposed to the "licensed" Chinese version) Gold Lions from thetubestore.com. GREAT sounding tubes in every way…every…except with Mumblecore…all other styles of music work fine (Late early music, early later music, neo classical, un-classical, bebop, crappy demo CDs of people who should not be playing music, random sound effects, specific sound effects, 45 rpm 12 inch vinyl that requires you to turn the thing over every 8.5 minutes, heavy metal and lighter alloy metal like Titanium, Richard Burton reading Dylan Thomas, Le Show, BBC3 crowd feet shuffling sounds…).

The 5751 Blackplates are excellent premium tubes, very dynamic.
For a more relaxed, classic sound from the same family of tubes is the RCA 12AX7 Blackplate.
The Blackplates have a very open sound.

I would also recommend Mullard Longplates, but tube rolling with Mullards can get very expensive.

GE or RCA triple mica blackplate 5751 from the 1950s.

I'm surprised you find the sound bright. What is the rest of your system?