Just tried the cheap and ok Bouyrang Reisong A50 Mark III Set 300B for $800USD. It was ok but couldn’t really push my 98dB sensitive horn speakers because of the twin 12” woofers. I’m not into soldering so I sold the amp to someone who might if they choose to upgrade. He was matching with Tannoy Gold 15” with 92dB sensitivity.
Overall ok, nothing super special just not enough power.
The best tube amp I owned was a KT88 integrated from Singapore 🇸🇬. Powerful bass and clean mids. I’ve also had Line Magnetic 518ia 845 tubes that was disappointing again not enough power to drive the PMC Twenty26 speakers of 86dB. And the Finale 805 tube amp was quite uneventful too. And the Primaluna Dialogue Premium was good but not masterful. I miss that KT88. But none had the impact and control that the PassLabs XA25 has/had. Synergy is critical with speaker matching a very important factor in getting the most out of your interest in tubes.