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I have a 25 year old SL-BD22 turn table that has a constant buzz. The buzz gets louder when I touch the end of the tune arm where the needle goes. The turntable ground wire is attached to the turntable and the ground on the tuner/amp.
Any ideas?
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The SL-BD22 turntable's tonearm does not have a headshell. It takes a P-mount (otherwise known as a T4P) cartridge which plugs directly into the end of the arm.
If the bearing is worn to the point of a rattle and a small amount of silicone oil won't stop it, then it should be replaced or the motor replaced. These bearings are normally lifetime impregnated with lubricants and can sometimes dry out with use and somewhat seize up causing what may sound like a rattle. If the motor shaft has worn down enough at the bearing point, then a rebuild or replacement is in order.
If you remove the rubber pad, you should be able to grasp the metal table. A gentle tap onto the center spindle while pulling up on the table should release the table. Place the new belt onto the underside of the table. Replace the table onto the spindle. Then feed the belt over the motor hub.
First of all test the amp sockets. With the turntable disconected plug in a cable to your amps phono socket. Touch with your finger the other end of the cable. You should hear a buzz. If you don't the pre-amp in the amp for the cartridge has failed (perhaps an IC). If you do reconnect the turntable. Now remove the wires to the cartridge. Again touch each one. On two you should a buzz (L&R). If you don't there's a fault in the cord to the deck. If you do the cartridge is faulty.
If everything seems ok with the power , there is usally a small microswitch that sends power to the motor when the tone arm is moved to the start of the record.
The switch might be bad or the lever that actuates it (connected to the tone arm) might be sticking. You may have to take the bottom cover off or remove the platter to see it.
Also make sure the belt is looped over the motor shaft. If the motor runs but the belt still doesnt turn, belt might be bad.
presuming it has "some" effect, then gnd wire itself it good. Even though there may be a gnd thumbscrew on the preamp try slipping the ground wire under a screw on the main amp or receiver that screws into metal and make sure the gnd wire is touching metal under the screw.
if that didn't help, then you may have:
>a cartridge with an open gnd internally.
>an open gnd wire from the back of the cartridge to the outer shields of the RCA connectors.
>or your neutral & hot wires of your house wiring might be reversed causing something weird.
>a low quality preamp. (it should have a seperate wall adaptor so that only low voltage dc goes near the preamp)
good luck ground issues can be tough!
Turntables require amplification, they have very low output on their own. If your Sherwood has an Aux input try using that, older receivers often had a built-in pre-amp on the aux jack. You can obtain a stand alone pre-amp for less than $50, I use one from mcm, #40-630.
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