I keep a notebook and write down the date and the elapsed time of listening to discs as well as to vinyl. This pretty well tells me how much time I have on my cartridge and also tells me how many hours I have on which tubes.
I tried that for a while. Turned out the total elapsed time I was able to tolerate listening to discs was zero. So now I just play records. When they sound good I play more. But they always sound good.
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