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Nick Sukhov SU-XXI MM Phono stage -85 dBA SN ratio...

I just wrote as it is, if you find that offensive, you gotta work on your soldering skills rather than take it the hard way 🙂
In my opinion, something that is being sold as a product should be done proper, and last for a while, not something riddled with cold solder joints. The latest picture here is done proper, as it should be.
 
I'm sure i can distinguish by looks what something is going to fail on me because of a human error. I'm also sure that would not pass any QC as a product suitable for market. I failed to mention sound anywhere, why focus on that which wasn't mentioned, instead of accepting and working on your soldering skill? Ego is a peculiar beast.
 
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I installed good NPO capacitors and a 1uF film capacitor.
Me too. I couldn't find any NPO capacitors for one microfarad. I put two of 0.47. I must admit that this particular capacitor doesn't decide anything about the sound. Well, the rest of the capacitors I used NPO of course. Even if I remove this capacitor, or shorten this chain, the result will not change in the rest of the frequency range.
 
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This photo shows X7R capacitors.
Absolutely right, these capacitors are in the factory assembly, I wrote about the manual assembly shown earlier, there was a nominal value of 2 x 0.47.
as I wrote before, it is this capacitor in the feedback that does not affect the sound quality, so it was decided to leave it X7

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