the linear tube audio zotl reference 40 tube amp is worth mentioning in this discussion
https://www.lineartubeaudio.com/products/zotl-40-reference-amplifier
a very special amp in that it uses the berning circuit, without output transformers and runs its 4x el34’s at a very modest biasing, thus very moderate heat (much less overall in my experience than a pass or belles class a ss amp, for instance)
the amp has a wonderful, sparkling clarity, speed and impact rarely found in tube power amps, kind of a ying to the primaluna’s yang in sonic attributes - but with all the midrange and imaging magic we expect from tubes (not to mention that w/o transformers, it is light as a feather... :)