Krell KAS amplifier hum

georgehifi6,400 posts

12-12-2019 12:32am


Also use some "earth cheater plugs" on the preamp and source/s so they get the earth from the Krells through the interconnects, this way you stop any more earth loops through the house wiring.

Use of ground cheaters for testing purposes only.

ICs signal grounds/small wires should never be used for safety equipment grounding conductors. In the event of a ground fault event not only could the ICs be damaged but worse yet audio equipment itself. Also worth mentioning in well designed audio equipment the circuit ground/signal ground is not connected directly (hard wired) to the chassis of the equipment where the safety equipment grounding conductor is bonded, connected. In many cases a small wattage low resistance resistor is used in series with the connection to connect the circuit ground/signal ground to the chassis.


Jim

You could try the Ebtech HumX, but you might need two.

Thank you all for taking the time.  After my first failed attempt last night, I decided to plug all "in" and listen to music instead :-)

Tonight, I will try what has been recommended.  Something else I forgot to mention; I have a cable line and box in this room.  The cable line runs parallel to the XLR (they do not touch) and is also plugged into the same 15A outlet the power distributor is plugged into...

with kind regards,
Jose

@ jg2077,

Does the cable box connect to the audio system, in question, in any way by wire type ICs?

Does the cable box 120V power cord have a 3 wire grounding type plug? If yes just for the heck of it unplug it from the wall convenience outlet tonight before you start disconnecting things for testing. Even if there is not any ICs connecting the cable box to the audio system.

A question that should have been asked at the start of this thread. Have you always had the hum in this audio system? If not at what point did you first notice the hum?

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