Have to Neco a bit too. Had bad humm on the left channel and on other tubes both channels.. 220uf 50V caps on the same places like in the pictures in this thread. No hum anymore. So nice^^ But with low ohm headphones there will be less bass. But used as a preamp feeding another headphoneamp ->...

Thanks for your help! I tried a bit around. Only with Power-> No noise Adding DAC-> noise is there So found the Problem^^ But i dont wanna exchange anything from my audio-GD stuff(Work perfektly together balanced). So i found an old cinch ground isolator(Power Concept) infront of the intake...

Hello, i have a little problem with my Valhalla2. When i turn the volumn to 1/3 and higher i start to hear a hum/his from my headphones. I already put the amp on a different spot without any other hardware, other power cord and plug. Changed gain. I still can hear it on my LCD-X and Fostex XR00...