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In Reply to: RE: Is the book blocking the bottom vents? posted by 1973shovel on November 08, 2015 at 18:46:33
Hi, thanks you guys! The hum comes from the amp and not the speakers. I don't know what the exact house voltage is but I will measure it. I was wondering about this. I have had Mark 3's and they had a choke to help with inductance. The ST-35 does not and the transformers are as close as you can get. Could the York cast weights act as sort of an iron core and act like a choke? The hum only stops with 2 and 1/2 pound weights placed over the cage area right over the center power transformer and comes back when shifted to the right or left. I appreciate all your answers and tips but am still puzzled why the weights only work while in the center.The cage never touches the transformers. I also have the amp isolated with rubber feet on a wooden platform. Thanks guys....Mark Korda
Follow Ups:
The cast iron weight is prolly affecting the EM field generated by the transformers. Maybe, absorbing some of this field and EM energy generated by the trannies. Kinda like an "EM sink" version of a heat sink for heat.
Plus, the weight changes the audio resonance frequencies of the unit. More weight usually lowers the resonance frequency, perhaps to below audible range. That's maybe why you need a certain amount of weight to work. Do you have any non-metal weights? Like maybe cement block or heavy wood? Be interesting if this is solely a weight/resonance or an EM field issue. Or both.
Just a WAG, mind you.
8^)
besides shielding, can an extra ground do anything????
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