91-01 is of Sophia Electric's modest priced level one amplifier. For those with Trio speakers should consider to go for Level Five Sophia Electric amplifiers or custom order. If 91-01 is of great sound, then 91-05 should have been in another league.
You simply can't expect a $4500 new pair of mono-block come with all Black Gate caps. Voicing is an art, spending money within a budget is also an art. Only fool would spend money without any sonic improvement.
I view the magical sound from Sophia Electric 91-01 as a great achievement. Some of the mega dollar 300B amplifiers from well known brands are not impressive sonically even though all expensive parts loaded.
Buyers and users should ask yourself if the sound is more important or the parts brand is more important in the end. The parts Sophia Electric used for 91-01 are above computer grade with mostly from brands like Sophia Electric CDE, Rubycon, allen bradley, Dale, Western Electric, etc.
91-01 also can run cool in long hours. As long as you do not push it beyond 8w amplifier can do, it should last for many years to come.