[djork]

Hi all, I have a little problem, when connected to my speakers / headphone, I can hear a very slight humming. Could it be due to the power line (i connect the tube amp directly to the socket, not sharing), or could it be the amp itself?

 

[dura]

Could be the transformator, due to pollution in the mains. Try reversing the powerplug.
Sometimes filters can help, but they can also degrade sound. There are even special offsetfilters that are supposed to reduce trafo-hum.

 

[Dept_of_Alchemy]

If it sounds like a 60Hz hum (and not some kHz hiss) then it's probably power-related. Try a conditioner.

 

[M0T0XGUY]

I agree. Your amp is probably receiving either inconsistent power, or pushing the limits of your socket. Buying a power conditioner would solve your problems, and they're relatively inexpensive to buy.