Author Topic: AC hum when headphones plugged in  (Read 4510 times)

KV6T

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AC hum when headphones plugged in
« on: 2012-01-26, 17:56:03 »
Hi,

If I plug the Control-RRC into a 120V outlet using the supplied power supply, I hear a 60Hz hum and some noise in my headphones.   This is with no other connections present on the device.   When I touch the box the unit is grounded and the hum does away.   When everything else is connected, touching metal (Bencher paddle, TS-480 metal tuning knob, Control-RRC chassis) also makes the hum go away.  Do you recommend installing a bypass capacitor somewhere?

Thanks,

Mark
KV6T