Hummining/noise with the increase in volume

[ajbar]

Hey guys/gals,

I completed my bottlehead amp but noticed that after I turn the volume up past half way I start to hear a humming noise, which gets louder the higher I turn up the volume. This humming noise is present without any music playing and even if the rca cables are disconnected. I would appreciate any help with removing/minimizing this noise!

Thank you in advance!

-Andrew

[Paul Birkeland]

Hello Andrew,

Which headphones are you using for this test?

With the level control up half way, is this a listenable range for your Crack with the particular set of headphones that you're using?

-PB