[nhparrot]

Originally Posted by bing!

^^^ yes. Without without the turntable. I even changed the cartridge, with the same result.

The only thing that I can isolate for the hum is the phono stage output gain. The hum is not present with another preamp. I wonder if there is an impedance issue?

https://www.psaudio.com/ps_how/how-to-find-and-fix-hum/