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Ask the cartridge gods...hehe
Seriously, if can notice a dip in the sound quality of the output, that's a pretty noticeable sign. Problems with the needle jumping, or losing back-cue positioning quickly are also tell-tale signs that your carts are going.
If you really can't tell, take them to a knowledgeable dealer of dj products, and ask what they think. (Note: try to ask someone knowledgeable outside the retail business, or they could just tell you they are bad because they are trying to make a sale.)
3 to 4 months with the 550's should be fine, even with the ordeal you've been putting yours through But I'd say it would be wise in the very near future to consider replacement, because you are risking ruining what vinyl you have now.
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I suffer from OPD.
Obsessive Progressive(House) Disorder.
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