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Hum

My analog setup consists of a Garrard 301, Ortofon tonearm, and Koetsu Rosewood cartridge. The phono stage is a Synthesis Roma 79 DC, the preamp is a Synthesis Roma 117 DC, and the power amps are Synthesis monoblocks.

 

I absolutely love the system and the music it produces. However, I do have one issue: there is a noticeable hum during dead air or before the stylus touches down on the record. Once the music starts, it largely disappears into the background. My digital front end is completely silent.

 

I’m looking for some insight into what might be causing this hum and possible solutions to eliminate or reduce it. Any advice would be greatly appreciated.

 

Thank you for your help.
 

John

curtisvill
noromance's avatar
noromance
10,479 posts
 

Assuming it’s not a grounding issue, ensure there’s no routers or WiFi devices nearby. My 65" TV will induce noise. LED lights can also do this. Test this by powering down these devices.

lewm
14,675 posts
 

If everything is grounded to everything, try disconnecting some ground wires. If TT, tonearm, and phono are not grounded to each other, try grounding them to each other. In addition to what noromance suggested, any major appliances that share the AC supply can put EMI back on the line. Try also turning TT motor off. It can also emit EMI, either through the air or on the AC line.

curtisvill OP
75 posts
 

If I turn off the turntable, the hum still exists. I will check my grounding wire to make sure all is well. Appreciate the advice.

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