This is a low end solid state amp and will always hum, that's just what solid state amps do. The ONLY way not have an amp that doesn't hum is to buy a tube amp, although on the lower end of tube amps, even used, will start at about $400, so if you're not prepared to spend that kind of money then just learn to accept the hum as part of solid state amplification. Good Luck!
Jason
September 2009