My stereo receive hums annoyingly when I use my record turntable.
I have a old Technics SL-D2 turntable and JVC RX212 Receiver. If the receiver is on, the humming begins as soon as I select "PHONO." If the receiver is off and set to "PHONO", the humming begins about 3 or 4 seconds after I turn on the receiver. The commencement of the humming is sudden, not gradual.
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Some turn tables do not have a built in amp, especially the older ones, the sound goes from the needle to the output. If the amp your are using does not have a designated phono, turn table, input it may not have the turn table pre-amp built in. Some turn tables have to be grounded to the amp to work properly.
If the turntable is belt driven you may have a stretched and slipping belt that needs replacement. This seems most likely and is simple to fix. You will have to lift off the turntable to see the mechanism beneath. It may be held on by a nut or clamp. A web search for the model name and "dirve belt" may yield a replacement.
If it is driven directly by a motor without a belt, the motor is probably dying. Replacement more involved, expensive, and hard to justify, unless you're really into vinyl.
The audio amplifier in the unit has failed, and that's what you smell. Turn it off and quit using it immediately - it presents a fire hazard. It might be possible to replace the bad parts. Depending on what it cost, you might want to take it somewhere for a repair estimate, but be prepared to learn it might not be fixable. Often the burned parts damage the circuit board as well.
Usually this happens in small stereo systems because of running them at high volumes for a long time. If you want to listen to loud music, you would be better off putting the money into a higher-power system.
I've had this happen before, and it is caused by your ground wire not being hooked up. Depending on the type and age of turntable, it will have an additional wire (the ground), that needs to be hooked up to either a screw or some sort of opening similar to your speaker wire hookup. That should take care of the problem. If you don't have a ground wire coming out of your turntable, I don't know how to help, other than figure out how to ground the turntable.