What does it take to make a top class phono stage? Great sound is a given, of course, but we also want easy cartridge matching, low levels of noise and excellent build quality. Pathos’s In The Groove delivers all these things in style.

The job of a phono stage is arguably the hardest of all in amplification. These units deal with very low-level signals – in the order of millivolts –  from a turntable, and amplify them by a factor of a thousand. Even the smallest distortions or added noise caused by the circuitry become obvious.

Also consider that a cartridge is fussy about the electrical interface between it and the phono stage. Every model has different electrical demands too. The scale of the task is enormous.
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https://www.whathifi.com/pathos/in-groove/review