Where to begin?
Dear Gary, Henry makes a VERY good point; if you have plugged your TT101 into the 120V wall outlet, that could very well be what is making your transformer hum. Even though the voltage is only slightly different from 100V, you had best use a step-down transformer. You may eventually damge the TT101, otherwise. They are available on eBay. You only need one that can handle 50W or slightly less.
BUT I am not clear on what you are hearing. In your last post it sounds like you may indeed be hearing hum through your speakers. If so, this is unlikely to be due to the power transformer. Look for another cause. As for EMF, the transformer and turntable motor are emitting EMF no matter whether they are noisy or not. I use a shield on my (coreless) LO7D motor (between the platter and the platter mat, made out of TI Shield available from Michael Percy). There never was any hum problem with LO7D; the shield reduces or removes a kind of gray-ish glare that colored the L07D output. TI Shield blocks both EMI and RFI. If you are hearing only a local mechanical hum directly from the tt, then go back to my first paragraph. If you are already using 100V step-down, then you just have one of those transformers that hums. Try reversing AC polarity; sometimes that helps.
Dear Henry, Of course you have to tap the shelf!!! The node will be at the same place regardless of how you stimulate the shelf to vibrate, so the result achieved by tapping and listening with the stethoscope is always valid. However, I do not think this has much if anything to do with airborne vibrations. This has to do with structure borne vibrations emanating from your environment. Even a wall is not inert, as you know better than I do. Plus there is the issue of micro-seismic activity. And your huge feet clumping around the room as you dance to the music.
When I was a medical student, everyone wanted a Littman stethoscope. But there is at least one other very good brand. I have not only two of my own but the one that belonged to my father, from before WWII. A�nd my wife would lend me hers in a pinch. (That is, if I pinched her.)
Dear Gary, Henry makes a VERY good point; if you have plugged your TT101 into the 120V wall outlet, that could very well be what is making your transformer hum. Even though the voltage is only slightly different from 100V, you had best use a step-down transformer. You may eventually damge the TT101, otherwise. They are available on eBay. You only need one that can handle 50W or slightly less.
BUT I am not clear on what you are hearing. In your last post it sounds like you may indeed be hearing hum through your speakers. If so, this is unlikely to be due to the power transformer. Look for another cause. As for EMF, the transformer and turntable motor are emitting EMF no matter whether they are noisy or not. I use a shield on my (coreless) LO7D motor (between the platter and the platter mat, made out of TI Shield available from Michael Percy). There never was any hum problem with LO7D; the shield reduces or removes a kind of gray-ish glare that colored the L07D output. TI Shield blocks both EMI and RFI. If you are hearing only a local mechanical hum directly from the tt, then go back to my first paragraph. If you are already using 100V step-down, then you just have one of those transformers that hums. Try reversing AC polarity; sometimes that helps.
Dear Henry, Of course you have to tap the shelf!!! The node will be at the same place regardless of how you stimulate the shelf to vibrate, so the result achieved by tapping and listening with the stethoscope is always valid. However, I do not think this has much if anything to do with airborne vibrations. This has to do with structure borne vibrations emanating from your environment. Even a wall is not inert, as you know better than I do. Plus there is the issue of micro-seismic activity. And your huge feet clumping around the room as you dance to the music.
When I was a medical student, everyone wanted a Littman stethoscope. But there is at least one other very good brand. I have not only two of my own but the one that belonged to my father, from before WWII. A�nd my wife would lend me hers in a pinch. (That is, if I pinched her.)