See if it occurs with another source other than TT. If it doesn't, the problem lies in the turntable/TT setup. If it does, switch the right and left speaker cables to see if it still occurs, or if it changes with the speaker. If it changes with the speaker, than it's upstream electronics. If the same speaker distorts, you probably have a blown woofer. If it can be isolated to the upstream electronics, maybe just a bad tube. Knowing something about the rest of your system will help, but the above is a start.
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