Your phono preamp is a vital component of your turntable system, even if you don’t know it. Generally the smallest and most affordable, it may be built into your turntable itself. Owing to its relatively low cost, its likely the most easily upgradable components in your whole system, and can potentially have a big impact on its sound.
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https://gearpatrol.com/2020/04/02/phono-preamp-explained/