Improve operational preamps

[nakato]

Good afternoon, I introduce myself from Spain, and I would like to ask a question.

I bought a Fosi Audio Box X2 phono preamplifier a month ago, and I have changed the vacuum tubes for better quality ones, noticing a clear improvement in sound quality. I also bought some LM4562 preamps, but the result is not as expected, since it gives the music more clarity but the mids and bass are lost, almost completely.
The standard preamplifiers are the 2068DD, which together are more balanced, but I would like to know if I could improve the result with any other preamplifier model and if so, which one do you recommend?

Thanks and regards.

 

[AIM65]

Welcome on DIYAudio !

There are some threads regarding JRC2068, this is a very good part, not sure you should expect any kind of improvement.

https://www.diyaudio.com/community/threads/jrc2068-substitute-plug-play.326174/

https://www.diyaudio.com/community/threads/can-i-replace-jrc2068d-with-lme49723.345774/

 

[nakato]

thanks AIM65

 

[Osvaldo de Banfield]

Which part of Spain are you? One of my ancestors was from Catalunia.
I'm fan of Joaquín Sabina and Joan Manuel Serrat and listened tgem several times toguether or as soloists in theaters.

 

[nakato]

Good morning, I am from the capital Madrid.

Good artists that you mention, highly valued in my country.

Thanks and best regards