Technics SD-L3 TURNTABLE

it may not be feedbacl, but ground hum. make sure the turntable is grounded. the turntable should have a ground wire with one end stripped. Bend the stripped, bare wire into a u shape and hook it around the ground screw of your receiver and tighten it down. If your turntable is already grounded, it may be feedback. you may have speakers too close to the TT or your volume is too high

Turntable round cables need to be plugged into a "phono" input. Check behind your receiver....

There's nothing wrong with the turntable then. It's your receiver that's the problem. In order to hear a magnetic cartridge it has to go via a pre-amp. It's this pre-amp that has failed in your receiver. It's only used by a turntable so wouldn't affect anything else. You should be able to trace this pre-amp by following the turntable socket wires. It will probably be a small IC that has failed. If you look up the number you should find it.

it needs a pre amp, or special phono input that will boost the signal, those old turntables have very low output lvl

Two Speed Direct Drive Fully Automatic Turntable with linear tracking ... Technics SL-L3 / SLL3 owners manual, service manuals and schematics are for ... www.vinylengine.com/library/technics/sl-l3.shtml

hope this will be of help

The AT-PL120 uses a magnetic cartridge to extract a music signal from the record. Magnetic cartridges all put out a very weak electric signal, and so their output must be strengthened, or amplified, to where it is as strong as the input from, say, a CD player. This amplification is provided by a pre-amp. If your receiver has dedicated "phono" inputs the pre-amp circuits are already in the receiver. If you do not have dedicated phono inputs you must either buy a pre-amp, or buy a magnetic cartridge turntable with a pre-amp built into itself. The AT-PL120 has a built in pre-amp. You can switch the AT-PL120's preamp on or off. The switch is located under the platter at the back side of the turntable. Take the platter mat off and turn one of the platter's holes to the back and you should see the switch through the hole. If you push the switch to LINE OUT the preamp is turned on and the turntable sends an amplified cartridge signal out the cables which MUST be connected to a receiver inout suitable for a CD player (a "high level" input). If you push the pre-amp selector switch to PHONO OUT the turntable sends the weak unstrengthened cartridge signal out the cables which MUST be connected to the receiver's dedicated PHONO inputs so the signal can be amplified with the receiver's own pre-amp circuits.

If everything is set wrong (i.e. LINE OUT (pre-amp on), and connected to phono inputs) you are applying two steps of strengthening to the turntable's signal which is too much. The resultant sound will be garbled. Try not to do this!

The other way to do everything wrong is set the pre-amp switch to PHONO OUT (pre-amp off) and connect the turntable's cables to a high level input. If this happens the turntable signal receives no amplification and the resultant sound will be thin and weak.

The problem is the fact that the new receiver has no phono input. The phono input has an extra stage of amplification built in. Your receiver is working fine. You need to purchase a phono pre-amp. These run around $20. Connect the turntable to the preamp and the presmp output to any line level input on your new receiver and everything will work as expected.

Dan

either the cartridge is bad in the phonograph tone arm.  Or the pre-amp in the stereo is bad...remember that the turntable is the only accessory that uses the pre-amp input on the stereo.  I'm betting the pre-amp is bad.

I assume you mean the output makes the crackling sound, not the turntable itself.

Is it only the turntable doing this? No other source? If yes, turn off your receiver and manually operate every function and control throughout its range and toggle every switch and button repeatedly to remove oxidation. The Tape Monitor control is famous for causing droputs even when it is OFF.

Listen carefully to the sound.

Is the sound dropping out or is the volume fluctuating?
Is the turntable tracking proerly or is it skipping, lifting off the platter?

Is it on both channels, one or random?

DE-select the phono on the receiver so the following is not passed through to the speakers.

Remove and reinstall the RCA phono plugs from your receiver using a twisting motion to remove oxidation. How is it now?

Most common problem is the belt getting soft, especially if it has sat for a long time. It will get a weak spot where it sat on the drive pulley and every time the turntable goes around and hits that weak spot it will slow down a little making it sound like a warped album.

The belts are usually very easy to replace. Usually just lift off the turntable or there might be a small clip on the center pin, then it lifts off. Replacement belts can be ordered from several places, as shown in this search... http://www.google.com/search?&q=SL-B200+Technics+turntable+belt