It’s impossible to say whether what you are hearing is “normal” or indicates there is a correctable problem in your phono stage. This is because we don’t have adequate information regarding the gain structure of your system, your cartridge, your amplifier, your speakers. However, solid-state guys may resent my saying this, I have often heard the sort of low level hiss you’re describing to emanate from a solid-state phono stage set at high gain or wide open. I would call it “white noise”.