I recently bought a tube amp for my PC (Litte Dot MKIII). I am using an USB DAC.
The problem is that there is ground loop related noise. There is a buzzing noise on high volumes. When I scroll a web page there is more noise. And when I play a game there is a lot of buzzing. Anyway, the cause is that the amp does not have isolated inputs and it's the PC's noisy ground that differs from the amps ground that is causing the noise. I tested using the amp with a cheater plug (no ground in power cable) and the noise is gone.
Since cheater plugs are not really safe, I am looking for a better fix.
Would a USB isolator work?
I found these two:
Any experience on these? Which one is better?