Just to make sure, please take a pencil and apply the same pressure on it with your thumb and first finger. If you feel vibration, it just proves that you are alive. But since this is probably really something in your Gyrodec, I would try first to find out the source of the vibration. Is it the motor or the platter for example, is the plinth turning smoothly, the bearing still OK. I'd also check the tonearm base. Since I've never owned a Gyrodec, these thoughts are far from being expert, just conjectures on my part. I would assume, that the vibrations affect the sound. If you have good hearing, try to listen to long drawn out notes of either voices or solo instruments. Do they remain stable in pitch?( good) Do they stay well defined in space,(good) or are they somewhat "ragged at the edges" (bad)?These are parameters I would try to test for influence on sound.
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