Step up on quality
Mounted on a Aiyima T1 Pro that goes into a Fosi ZA3 and the sound improved, sound stage is much better, bass is full, controlled, treble is clear, mids are velvet smooth for jazz, now I select “direct” instead of “tone” because it sounds so good, maybe it has to do with aiyima valves, and stock opamps on the ZA3. What a surprise the combination.

LT1028 review
This op-amp positively surprised me already during the comparison with other op-amps. It doesn’t create fireworks — it is neutral and precise. It has less noise than the other op-amps. Maybe it’s a little bit analytical, but with a tube preamp it does a great job. I’m satisfied, Sparkos was too blurred for me in this system