AYRE VX-5 TWENTY- WHICH TUBE PREAMP MATCHS

Ayre is especially good with balanced preamps.  The Ayre preamps, Aesthetix, and Rogue RP-7 all click those boxes.

Good point, Atmosphere.  I assume you mean by “balanced standard” that there are conpanies that incorporate XLR jacks but that they have single ended circuitry, as opposed to fully balanced designs such as those by Ayre and Aestestix?

I had XLRs on my former preamp, a Modwright LS100.  They were there to permit using XLR cables but they were not balanced, and there would be no sonic benefit to using them.