Repair / Help Forum > Repair / Help
clip on RF chokes
papabearjew:
Nope...Not Grado Hum. Same thing happens with the OEM ReVox/AKG, Stanton, Shure and AT cartridges
Sir Thrift-a-Lot:
Oh. Can you hear anything when the amp is off, like any sign of rubbing or grinding at the motor? The fact that it changes with RPM really makes me think it is somehow motor based.
MacGeek:
Which table? Belt or direct drive?
papabearjew:
Definitely seems motor based. Hum is through speakers and is most annoying with classical music during quiet passages. T/T is ReVox B795 which is direct drive
ataudio:
Given its DD and older you might wanna start looking at swollen/leaky caps. According
to an article I read on the web the motor has a tach that is compared to a ref frequency.
Aging caps in the power supply, drive circuit, etc could be your culprit. Treat it like a vintage amp...start with the caps.
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