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Generally the cause is one of 3 things. 1 Damage to the stylus or dirt. 2 Lack of pressure to the stylus. 3 Anti-skate control set to low.
First check the stylus you should feel it sticking in you finger a bit. 2 Has the weight on the end of the arm become lose? Adjust for the correct tracking weight of the cartridge. 3 Check the manual for what the anti-skate control should be set to.
The stylus should either just clip out or slide out depending on the type of cartridge fitted. On the weight thing look at the other end of the arm. It should have either somekind of screw or a weight with numbers on it. Slacken the weight and move it so the head where the cartridge is gets heavy. If it has numbers turn it to around 2 or 3 or higher and test/adjust using a record till it plays and doesn't make too much rumble sound when playing (in the gaps with no music) with both types of weight.
Make sure you have the deck set up correctly! Check the headshell - is the cartridge out of alignment or is the stylus worn?
Also, it may be that the counterweight is set too lightly for the cartridge and check the anti-skate control as well (example if the arm is tracking at 2 grams, anti-skate must be set at 2).
Follow these instructions for setting the counter balance:
Turn the weight so that the arm is just floating then set the balance ring (with the numbers on) you will see there is a line. Turn the ring not the weight to the ZERO mark where the line is on the top of the arm. Now turn the weight and ring together where it moves forward down the arm and set it at about 2 grams.
Now set the arm using the height adjustment that is the ring fitted to armboard and make sure the arm is straight (if not, the stylus will mistrack). Now try the deck again. You might have to make adjustments to the tracking weight again so whatever you have it set to, set the anti-skate to the same!
I have no experience of Crosley turntables, however, stylus arm skating across the record surface on any turntable is normally due to the counter balance weight being incorrectly adjusted. In order to track across a record properly, the stylus must press down on to the record very lightly. If there is too little pressure, skating is what tends to happen. Too much pressure can cause distortion of the sound and excessive wear of the record.
At the pivoting end of the stylus arm, there should be a counter balence weight. This is normally adjustable (but not always - depends on quality and features of the particular turntable), and is used to set the pressure the stylus applies to the record surface, measured in grammes. The manual that came with it should tell you how to adjust it, but for most turntables stylus pressure is between 1 to 3 grammes.
If you dont have the manual, have a good look at the pivoting end of the stylus arm to see if soemthing is obviously wrong, or if not whether there is something with numbers on it that can be turned or slid. This is likley to be the counter weight. Try adjusting it.
Within reason, the stylus weight isnt critical so a "trial and error" approach wont do any harm.
http://ortofon.de/ should give you the weight. It should also give you the range of tracking force. To get the right weight you can use a stylus balance. The electronic ones are expensive but good. The mechanical ones are not great but better than nothing. I set my turntable up with an Ortofon-branded mechanical balance for weight, and a test record for tracking force.
IMO the problem can be solved in 2 ways, either move the counterweight on the back of the arm towards the turning point of the arm ( by just adjusting it 10 - 20 % of an whole spin you can adjust a lot), or buy an other needle which is heavier then this one...
not passing the "wow and flutter" specs, eh?
The most common cause of this is a loose or defective belt. An inferior belt will have varying thicknesses along it's length. When it hits a skinny part, it will slow slightly. When it hits the thick part, it will speed slightly. Overall effect is that the record sounds warped.
needledoctor.com has got some good stuff.
There are two main things that will influence the anti skate settings.
1) The Headshell Weight and Balance
Firstly, check the data sheet for the cartridge and stylus you are using. It should tell you the correct weight setting which will vary from one cartridge and stylus to another. If the stylus is set too light, it can skate across the disc. This can damage the disc and the stylus. The sound will also be thin and it is likely to distort on high frequencies. If the weight is too heavy, it will not jump but will definitely damage the disc.
If you are a serious vinyl user, get yourself a tone arm balance. This is a device that you place on the turntable and you rest the stylus on a plate which is marked in micrograms. You place the stylus exactly at the correct weight marking and then make adjustments to the turntable settings until the tone arm is balanced. It's easier than it sounds!
If you don't have the data sheet for your cartridge and stylus and cannot find it online, use an old disc that you don't mind damaging, set the weight on the light side and gradually increase the weight until it stops skating.
2) Platter Levelling
Secondly, you need to make sure your turntable us on a level surface. If you are a purist, use a spirit level. to do this.
There are other things that can cause skating and jumping, especially if you use the turntable as a DJ. For example, vibration (caused hopefully by dozens rocking to your music). DJs will often increase the headshell weight very slightly to overcome this and I have sometimes placed the turntables on a thick rubber sheet such as carpet underlay to improve shock absorption.