I'll second it. Likely the inverter. I tried my Schertler with a modified sine wave inverter and got a buzzing noise too. To noisy to be useful. It worked OK with my solid state electric guitar amp and others report success powering certain PA speakers with a modified wave inverter. Unfortunately, pure sine wave inverters are pretty expensive but it seems for certain amps it may be the way to go to get rid of the noise.
Good Luck
hunter
|