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In 1978 I have a lecture about turntables& tonearms in our home town for Audio music club. When I was explaning how turntable is sensitive about outer disturbances we all looked through the window- becaue we heard rumble noise associated with heavy truck passing the building. But there was none and then rumble turn into shaking and we realise that is is an eartquake. Most people left the room and went outside. After several minutes everybody came back and I started again the lecture. I said, when I will come back home I nedd to readjust my tonearm again. Later in the night we got another one, but then I decided that my products in future should be Q. proof.