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Disconnect ALL of the wires to the cartridge. With the amplifier on, the turntable connected, put your finger on each one of the wire ends to the cartridge one at a time. On two of the wires you should hear a loud hum, one on the left and one on the right. The other two wires are earths and will probably make little or no sound at all.
If you hear the hum then the amplifier is working and the connections between the deck and amp are good. In which case you have a faulty cartridge or poor connectors to it.
If you get no hum, then either the wires between the deck and amp are faulty. Or there is a fault in the magnetic cartridge pre-amp inside the amp. If the hum is weak, that too could indicate a faulty pre-amp. Or that your amp doesn't have one. In which case you will need to connect one between the deck and amp. This will apply if the amp has no dedicated "phono" socket.
possibly the microphone needs more power than your sound card can supply although I cannot imagine as the duet is a good piece of equipment.
Is the duet USB bus powered?
Have you tried another cable? Possibly one wire is defective which means that phantom power will superpose the audio signal. In this case you might hear a hum. By the way this results in 6dB of signal loss. This is why XLR plugs have 3 wires. If connected with a 1/4" jack it has to be a stereo plug (tip, ring, sleeve)
I have the same mic, same problem. I disassemled the mic, put it back together, and the problem fixed itself. I can't explain exactly why. To disassemble the top part of mic, turn the 2 plastic posts inside the mic clockwise. http://www.akg.com/mediendatenbank2/psfile/datei/96/C4000b4055d1f13eb44.pdf
Definitely sounds like a ground issue, try plugging it into an outlet on a seperate house circuit, or you could always live on the edge and clip the ground on the plug via an adapter plug.
A buzz in one ear and no sound in the other 'sounds' like an open connection inside the headphones. The K240-series uses three wires from the pin to the headphones. Try this link to get wiring schematics and disassembly details: http://www.akg.com/site/powerslave,id,7,nodeid,7,_language,EN,cat,11.html
See if you have a screw marked EAC This to power an Electronic Air Cleaner unlike the HUM it also gets 120VAC only when the fan comes on. Not sure what make of furnace you have but if your heat is working OK don'tn change the control board the can be very expensive. there are other ways to wire humidifiers without using the HUN screw
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