Screw grounding!

I mentioned awhile ago that my STOCK setton BS-5500 amp had developed a bad hum in both channels. well, that problem is now solved.

Settons have the IEC power cords which are grounded. today i was trying to fix the hum problem by reversing the plug's polarity. this didn't do anything.

But, then I removed the round metal ground pin from the plug to see if this would help at all--and it fixed the hum! amazing!

I really wonder why the engineers had the amplifier grounded if grounding it only caused a hum.

my stock BS-5500 is ready to play as soon as my preamp comes!


Henry

You might check your electrical service and see if you have some feedback coming through the ground leg from either the power company or some other appliance plugged in the circuit.

I concur with Larry, but i have one question:
Did you have any ground at all? I mean, from the electric main board to the outside ground/earth?

I always believe that one of the more effective upgrades in sonic terms comes from an independent electric circuit to all the audio gear. Grounded, of course.