Looking for brighter tubes


Attention tube heads: I'm looking for brighter (more treble...not higher amounts of glow and chrome) tubes, if they exist. My amp (Jolida JD502P) has a well regarded bunch of Russian Tung Sol 6550s and 12AX7/12AT7s but I'm wondering if there's anything out there that imparts more sizzle in this amp. I do like the amp as it is...but hey..."rolling rolling rolling, keep them tubeys rolling...
wolf_garcia
Wolf.

5751 tubes will make amp smoother on the top end.

You can also purchase 12 types with more lush sound like Black Sable Tung Sol with gold pin or Mullard ECC83 for richer, lush mids and open top end.

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Try Telefunken 12AX7, great midrange and probably more high frequencies than the Russian counterpoint.

For 12AT7 the most HF info I've experienced is the pinch waist Phillips. They are difficult to find and probably expensive by now.
What 12ax7 and 12at7s are you presently using and which ones have you already tried? Also have you tried any KT88s in place of the 6550s?
You'd probably find the NOS German tubes to be your best bet (Telefunken or Siemens).